diff --git a/src/material-experimental/mdc-slide-toggle/BUILD.bazel b/src/material-experimental/mdc-slide-toggle/BUILD.bazel
index a87a5a0568f6..288f27134ff5 100644
--- a/src/material-experimental/mdc-slide-toggle/BUILD.bazel
+++ b/src/material-experimental/mdc-slide-toggle/BUILD.bazel
@@ -1,14 +1,17 @@
 package(default_visibility = ["//visibility:public"])
 
 load("@io_bazel_rules_sass//:defs.bzl", "sass_binary", "sass_library")
-load("//tools:defaults.bzl", "ng_e2e_test_library", "ng_module", "ng_test_library", "ng_web_test_suite")
+load("//tools:defaults.bzl", "ng_e2e_test_library", "ng_module", "ng_test_library", "ng_web_test_suite", "ts_library")
 load("//src/e2e-app:test_suite.bzl", "e2e_test_suite")
 
 ng_module(
     name = "mdc-slide-toggle",
     srcs = glob(
         ["**/*.ts"],
-        exclude = ["**/*.spec.ts"],
+        exclude = [
+            "**/*.spec.ts",
+            "harness/**",
+        ],
     ),
     assets = [":slide_toggle_scss"] + glob(["**/*.html"]),
     module_name = "@angular/material-experimental/mdc-slide-toggle",
@@ -24,6 +27,18 @@ ng_module(
     ],
 )
 
+ts_library(
+    name = "harness",
+    srcs = glob(
+        ["harness/**/*.ts"],
+        exclude = ["**/*.spec.ts"],
+    ),
+    deps = [
+        "//src/cdk-experimental/testing",
+        "//src/cdk/coercion",
+    ],
+)
+
 sass_library(
     name = "mdc_slide_toggle_scss_lib",
     srcs = glob(["**/_*.scss"]),
@@ -53,9 +68,13 @@ ng_test_library(
         exclude = ["**/*.e2e.spec.ts"],
     ),
     deps = [
+        ":harness",
         ":mdc-slide-toggle",
+        "//src/cdk-experimental/testing",
+        "//src/cdk-experimental/testing/testbed",
         "//src/cdk/bidi",
         "//src/cdk/testing",
+        "//src/material/slide-toggle",
         "@npm//@angular/forms",
         "@npm//@angular/platform-browser",
     ],
diff --git a/src/material-experimental/mdc-slide-toggle/harness/mdc-slide-toggle-harness.ts b/src/material-experimental/mdc-slide-toggle/harness/mdc-slide-toggle-harness.ts
new file mode 100644
index 000000000000..1320b071e2a6
--- /dev/null
+++ b/src/material-experimental/mdc-slide-toggle/harness/mdc-slide-toggle-harness.ts
@@ -0,0 +1,127 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {ComponentHarness, HarnessPredicate} from '@angular/cdk-experimental/testing';
+import {coerceBooleanProperty} from '@angular/cdk/coercion';
+import {SlideToggleHarnessFilters} from './slide-toggle-harness-filters';
+
+
+/**
+ * Harness for interacting with a MDC-based mat-slide-toggle in tests.
+ * @dynamic
+ */
+export class MatSlideToggleHarness extends ComponentHarness {
+  static hostSelector = 'mat-slide-toggle';
+
+  /**
+   * Gets a `HarnessPredicate` that can be used to search for a slide-toggle w/ specific attributes.
+   * @param options Options for narrowing the search:
+   *   - `label` finds a slide-toggle with specific label text.
+   * @return a `HarnessPredicate` configured with the given options.
+   */
+  static with(options: SlideToggleHarnessFilters = {}): HarnessPredicate<MatSlideToggleHarness> {
+    return new HarnessPredicate(MatSlideToggleHarness)
+        .addOption('label', options.label,
+            (harness, label) => HarnessPredicate.stringMatches(harness.getLabelText(), label));
+  }
+
+  private _label = this.locatorFor('label');
+  private _input = this.locatorFor('input');
+  private _inputContainer = this.locatorFor('.mdc-switch');
+
+  /** Gets a boolean promise indicating if the slide-toggle is checked. */
+  async isChecked(): Promise<boolean> {
+    const checked = (await this._input()).getAttribute('checked');
+    return coerceBooleanProperty(await checked);
+  }
+
+  /** Gets a boolean promise indicating if the slide-toggle is disabled. */
+  async isDisabled(): Promise<boolean> {
+    const disabled = (await this._input()).getAttribute('disabled');
+    return coerceBooleanProperty(await disabled);
+  }
+
+  /** Gets a boolean promise indicating if the slide-toggle is required. */
+  async isRequired(): Promise<boolean> {
+    const required = (await this._input()).getAttribute('required');
+    return coerceBooleanProperty(await required);
+  }
+
+  /** Gets a boolean promise indicating if the slide-toggle is valid. */
+  async isValid(): Promise<boolean> {
+    const invalid = (await this.host()).hasClass('ng-invalid');
+    return !(await invalid);
+  }
+
+  /** Gets a promise for the slide-toggle's name. */
+  async getName(): Promise<string | null> {
+    return (await this._input()).getAttribute('name');
+  }
+
+  /** Gets a promise for the slide-toggle's aria-label. */
+  async getAriaLabel(): Promise<string | null> {
+    return (await this._input()).getAttribute('aria-label');
+  }
+
+  /** Gets a promise for the slide-toggle's aria-labelledby. */
+  async getAriaLabelledby(): Promise<string | null> {
+    return (await this._input()).getAttribute('aria-labelledby');
+  }
+
+  /** Gets a promise for the slide-toggle's label text. */
+  async getLabelText(): Promise<string> {
+    return (await this._label()).text();
+  }
+
+  /** Focuses the slide-toggle and returns a void promise that indicates action completion. */
+  async foucs(): Promise<void> {
+    return (await this._input()).focus();
+  }
+
+  /** Blurs the slide-toggle and returns a void promise that indicates action completion. */
+  async blur(): Promise<void> {
+    return (await this._input()).blur();
+  }
+
+  /**
+   * Toggle the checked state of the slide-toggle and returns a void promise that indicates when the
+   * action is complete.
+   *
+   * Note: This attempts to toggle the slide-toggle as a user would, by clicking it.
+   */
+  async toggle(): Promise<void> {
+    const elToClick = await this.isDisabled() ? this._inputContainer() : this._input();
+    return (await elToClick).click();
+  }
+
+  /**
+   * Puts the slide-toggle in a checked state by toggling it if it is currently unchecked, or doing
+   * nothing if it is already checked. Returns a void promise that indicates when the action is
+   * complete.
+   *
+   * Note: This attempts to check the slide-toggle as a user would, by clicking it.
+   */
+  async check(): Promise<void> {
+    if (!(await this.isChecked())) {
+      await this.toggle();
+    }
+  }
+
+  /**
+   * Puts the slide-toggle in an unchecked state by toggling it if it is currently checked, or doing
+   * nothing if it is already unchecked. Returns a void promise that indicates when the action is
+   * complete.
+   *
+   * Note: This attempts to uncheck the slide-toggle as a user would, by clicking it.
+   */
+  async uncheck(): Promise<void> {
+    if (await this.isChecked()) {
+      await this.toggle();
+    }
+  }
+}
diff --git a/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness-filters.ts b/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness-filters.ts
new file mode 100644
index 000000000000..d0ed25251198
--- /dev/null
+++ b/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness-filters.ts
@@ -0,0 +1,11 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export type SlideToggleHarnessFilters = {
+  label?: string | RegExp
+};
diff --git a/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness.spec.ts b/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness.spec.ts
new file mode 100644
index 000000000000..549869b5e820
--- /dev/null
+++ b/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness.spec.ts
@@ -0,0 +1,193 @@
+import {HarnessLoader} from '@angular/cdk-experimental/testing';
+import {TestbedHarnessEnvironment} from '@angular/cdk-experimental/testing/testbed';
+import {Component} from '@angular/core';
+import {ComponentFixture, TestBed} from '@angular/core/testing';
+import {FormControl, ReactiveFormsModule} from '@angular/forms';
+import {MatSlideToggleModule} from '@angular/material/slide-toggle';
+import {MatSlideToggleModule as MatMdcSlideToggleModule} from '../index';
+import {MatSlideToggleHarness} from './slide-toggle-harness';
+import {MatSlideToggleHarness as MatMdcSlideToggleHarness} from './mdc-slide-toggle-harness';
+
+
+let fixture: ComponentFixture<SlideToggleHarnessTest>;
+let loader: HarnessLoader;
+let slideToggleHarness: typeof MatSlideToggleHarness;
+
+describe('MatSlideToggleHarness', () => {
+  describe('non-MDC-based', () => {
+    beforeEach(async () => {
+      await TestBed.configureTestingModule({
+        imports: [MatSlideToggleModule, ReactiveFormsModule],
+        declarations: [SlideToggleHarnessTest],
+      }).compileComponents();
+
+      fixture = TestBed.createComponent(SlideToggleHarnessTest);
+      fixture.detectChanges();
+      loader = TestbedHarnessEnvironment.loader(fixture);
+      slideToggleHarness = MatSlideToggleHarness;
+    });
+
+    runTests();
+  });
+
+  describe('MDC-based', () => {
+    beforeEach(async () => {
+      await TestBed.configureTestingModule({
+        imports: [MatMdcSlideToggleModule, ReactiveFormsModule],
+        declarations: [SlideToggleHarnessTest],
+      }).compileComponents();
+
+      fixture = TestBed.createComponent(SlideToggleHarnessTest);
+      fixture.detectChanges();
+      loader = TestbedHarnessEnvironment.loader(fixture);
+      // Public APIs are the same as MatSlideToggleHarness, but cast is necessary because of
+      // different private fields.
+      slideToggleHarness = MatMdcSlideToggleHarness as any;
+    });
+
+    runTests();
+  });
+});
+
+/** Shared tests to run on both the original and MDC-based slide-toggles. */
+function runTests() {
+  it('should load all slide-toggle harnesses', async () => {
+    const slideToggles = await loader.getAllHarnesses(slideToggleHarness);
+    expect(slideToggles.length).toBe(2);
+  });
+
+  it('should load slide-toggle with exact label', async () => {
+    const slideToggles = await loader.getAllHarnesses(slideToggleHarness.with({label: 'First'}));
+    expect(slideToggles.length).toBe(1);
+    expect(await slideToggles[0].getLabelText()).toBe('First');
+  });
+
+  it('should load slide-toggle with regex label match', async () => {
+    const slideToggles = await loader.getAllHarnesses(slideToggleHarness.with({label: /^s/i}));
+    expect(slideToggles.length).toBe(1);
+    expect(await slideToggles[0].getLabelText()).toBe('Second');
+  });
+
+  it('should get checked state', async () => {
+    const [checkedToggle, uncheckedToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    expect(await checkedToggle.isChecked()).toBe(true);
+    expect(await uncheckedToggle.isChecked()).toBe(false);
+  });
+
+  it('should get disabled state', async () => {
+    const [enabledToggle, disabledToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    expect(await enabledToggle.isDisabled()).toBe(false);
+    expect(await disabledToggle.isDisabled()).toBe(true);
+  });
+
+  it('should get required state', async () => {
+    const [requiredToggle, optionalToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    expect(await requiredToggle.isRequired()).toBe(true);
+    expect(await optionalToggle.isRequired()).toBe(false);
+  });
+
+  it('should get valid state', async () => {
+    const [requiredToggle, optionalToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    expect(await optionalToggle.isValid()).toBe(true, 'Expected optional toggle to be valid');
+    expect(await requiredToggle.isValid())
+        .toBe(true, 'Expected required checked toggle to be valid');
+    await requiredToggle.uncheck();
+    expect(await requiredToggle.isValid())
+        .toBe(false, 'Expected required unchecked toggle to be invalid');
+  });
+
+  it('should get name', async () => {
+    const slideToggle = await loader.getHarness(slideToggleHarness.with({label: 'First'}));
+    expect(await slideToggle.getName()).toBe('first-name');
+  });
+
+  it('should get aria-label', async () => {
+    const slideToggle = await loader.getHarness(slideToggleHarness.with({label: 'First'}));
+    expect(await slideToggle.getAriaLabel()).toBe('First slide-toggle');
+  });
+
+  it('should get aria-labelledby', async () => {
+    const slideToggle = await loader.getHarness(slideToggleHarness.with({label: 'Second'}));
+    expect(await slideToggle.getAriaLabelledby()).toBe('second-label');
+  });
+
+  it('should get label text', async () => {
+    const [firstToggle, secondToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    expect(await firstToggle.getLabelText()).toBe('First');
+    expect(await secondToggle.getLabelText()).toBe('Second');
+  });
+
+  it('should focus slide-toggle', async () => {
+    const slideToggle = await loader.getHarness(slideToggleHarness.with({label: 'First'}));
+    expect(getActiveElementTagName()).not.toBe('input');
+    await slideToggle.foucs();
+    expect(getActiveElementTagName()).toBe('input');
+  });
+
+  it('should blur slide-toggle', async () => {
+    const slideToggle = await loader.getHarness(slideToggleHarness.with({label: 'First'}));
+    await slideToggle.foucs();
+    expect(getActiveElementTagName()).toBe('input');
+    await slideToggle.blur();
+    expect(getActiveElementTagName()).not.toBe('input');
+  });
+
+  it('should toggle slide-toggle', async () => {
+    fixture.componentInstance.disabled = false;
+    const [checkedToggle, uncheckedToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    await checkedToggle.toggle();
+    await uncheckedToggle.toggle();
+    expect(await checkedToggle.isChecked()).toBe(false);
+    expect(await uncheckedToggle.isChecked()).toBe(true);
+  });
+
+  it('should check slide-toggle', async () => {
+    fixture.componentInstance.disabled = false;
+    const [checkedToggle, uncheckedToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    await checkedToggle.check();
+    await uncheckedToggle.check();
+    expect(await checkedToggle.isChecked()).toBe(true);
+    expect(await uncheckedToggle.isChecked()).toBe(true);
+  });
+
+  it('should uncheck slide-toggle', async () => {
+    fixture.componentInstance.disabled = false;
+    const [checkedToggle, uncheckedToggle] = await loader.getAllHarnesses(slideToggleHarness);
+    await checkedToggle.uncheck();
+    await uncheckedToggle.uncheck();
+    expect(await checkedToggle.isChecked()).toBe(false);
+    expect(await uncheckedToggle.isChecked()).toBe(false);
+  });
+
+  it('should not toggle disabled slide-toggle', async () => {
+    const disabledToggle = await loader.getHarness(slideToggleHarness.with({label: 'Second'}));
+    expect(await disabledToggle.isChecked()).toBe(false);
+    await disabledToggle.toggle();
+    expect(await disabledToggle.isChecked()).toBe(false);
+  });
+}
+
+function getActiveElementTagName() {
+  return document.activeElement ? document.activeElement.tagName.toLowerCase() : '';
+}
+
+@Component({
+  template: `
+      <mat-slide-toggle
+          [formControl]="ctrl"
+          required
+          name="first-name"
+          aria-label="First slide-toggle">
+        First
+      </mat-slide-toggle>
+      <mat-slide-toggle [disabled]="disabled" aria-labelledby="second-label">
+        Second
+      </mat-slide-toggle>
+      <span id="second-label">Second slide-toggle</span>
+  `
+})
+class SlideToggleHarnessTest {
+  ctrl = new FormControl(true);
+  disabled = true;
+}
+
diff --git a/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness.ts b/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness.ts
new file mode 100644
index 000000000000..59d7b4bc7081
--- /dev/null
+++ b/src/material-experimental/mdc-slide-toggle/harness/slide-toggle-harness.ts
@@ -0,0 +1,126 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {ComponentHarness, HarnessPredicate} from '@angular/cdk-experimental/testing';
+import {coerceBooleanProperty} from '@angular/cdk/coercion';
+import {SlideToggleHarnessFilters} from './slide-toggle-harness-filters';
+
+
+/**
+ * Harness for interacting with a standard mat-slide-toggle in tests.
+ * @dynamic
+ */
+export class MatSlideToggleHarness extends ComponentHarness {
+  static hostSelector = 'mat-slide-toggle';
+
+  /**
+   * Gets a `HarnessPredicate` that can be used to search for a slide-toggle w/ specific attributes.
+   * @param options Options for narrowing the search:
+   *   - `label` finds a slide-toggle with specific label text.
+   * @return a `HarnessPredicate` configured with the given options.
+   */
+  static with(options: SlideToggleHarnessFilters = {}): HarnessPredicate<MatSlideToggleHarness> {
+    return new HarnessPredicate(MatSlideToggleHarness)
+        .addOption('label', options.label,
+            (harness, label) => HarnessPredicate.stringMatches(harness.getLabelText(), label));
+  }
+
+  private _label = this.locatorFor('label');
+  private _input = this.locatorFor('input');
+  private _inputContainer = this.locatorFor('.mat-slide-toggle-bar');
+
+  /** Gets a boolean promise indicating if the slide-toggle is checked. */
+  async isChecked(): Promise<boolean> {
+    const checked = (await this._input()).getAttribute('checked');
+    return coerceBooleanProperty(await checked);
+  }
+
+  /** Gets a boolean promise indicating if the slide-toggle is disabled. */
+  async isDisabled(): Promise<boolean> {
+    const disabled = (await this._input()).getAttribute('disabled');
+    return coerceBooleanProperty(await disabled);
+  }
+
+  /** Gets a boolean promise indicating if the slide-toggle is required. */
+  async isRequired(): Promise<boolean> {
+    const required = (await this._input()).getAttribute('required');
+    return coerceBooleanProperty(await required);
+  }
+
+  /** Gets a boolean promise indicating if the slide-toggle is valid. */
+  async isValid(): Promise<boolean> {
+    const invalid = (await this.host()).hasClass('ng-invalid');
+    return !(await invalid);
+  }
+
+  /** Gets a promise for the slide-toggle's name. */
+  async getName(): Promise<string | null> {
+    return (await this._input()).getAttribute('name');
+  }
+
+  /** Gets a promise for the slide-toggle's aria-label. */
+  async getAriaLabel(): Promise<string | null> {
+    return (await this._input()).getAttribute('aria-label');
+  }
+
+  /** Gets a promise for the slide-toggle's aria-labelledby. */
+  async getAriaLabelledby(): Promise<string | null> {
+    return (await this._input()).getAttribute('aria-labelledby');
+  }
+
+  /** Gets a promise for the slide-toggle's label text. */
+  async getLabelText(): Promise<string> {
+    return (await this._label()).text();
+  }
+
+  /** Focuses the slide-toggle and returns a void promise that indicates action completion. */
+  async foucs(): Promise<void> {
+    return (await this._input()).focus();
+  }
+
+  /** Blurs the slide-toggle and returns a void promise that indicates action completion. */
+  async blur(): Promise<void> {
+    return (await this._input()).blur();
+  }
+
+  /**
+   * Toggle the checked state of the slide-toggle and returns a void promise that indicates when the
+   * action is complete.
+   *
+   * Note: This toggles the slide-toggle as a user would, by clicking it.
+   */
+  async toggle(): Promise<void> {
+    return (await this._inputContainer()).click();
+  }
+
+  /**
+   * Puts the slide-toggle in a checked state by toggling it if it is currently unchecked, or doing
+   * nothing if it is already checked. Returns a void promise that indicates when the action is
+   * complete.
+   *
+   * Note: This attempts to check the slide-toggle as a user would, by clicking it.
+   */
+  async check(): Promise<void> {
+    if (!(await this.isChecked())) {
+      await this.toggle();
+    }
+  }
+
+  /**
+   * Puts the slide-toggle in an unchecked state by toggling it if it is currently checked, or doing
+   * nothing if it is already unchecked. Returns a void promise that indicates when the action is
+   * complete.
+   *
+   * Note: This toggles the slide-toggle as a user would, by clicking it.
+   */
+  async uncheck(): Promise<void> {
+    if (await this.isChecked()) {
+      await this.toggle();
+    }
+  }
+}