diff --git a/src/cdk/a11y/interactivity-checker/interactivity-checker.ts b/src/cdk/a11y/interactivity-checker/interactivity-checker.ts
index 723da6f717f..59092c79167 100644
--- a/src/cdk/a11y/interactivity-checker/interactivity-checker.ts
+++ b/src/cdk/a11y/interactivity-checker/interactivity-checker.ts
@@ -55,7 +55,7 @@ export class InteractivityChecker {
    * @returns Whether the element is tabbable.
    */
   isTabbable(element: HTMLElement): boolean {
-    // Nothing is tabbable on the the server 😎
+    // Nothing is tabbable on the server 😎
     if (!this._platform.isBrowser) {
       return false;
     }
diff --git a/src/cdk/overlay/overlay-ref.ts b/src/cdk/overlay/overlay-ref.ts
index 5c6ddb1b570..75b98277031 100644
--- a/src/cdk/overlay/overlay-ref.ts
+++ b/src/cdk/overlay/overlay-ref.ts
@@ -267,7 +267,7 @@ export class OverlayRef implements PortalOutlet, OverlayReference {
     return this._keydownEventsObservable;
   }
 
-  /** Gets the the current overlay configuration, which is immutable. */
+  /** Gets the current overlay configuration, which is immutable. */
   getConfig(): OverlayConfig {
     return this._config;
   }
diff --git a/src/cdk/portal/portal.ts b/src/cdk/portal/portal.ts
index 885f13361b8..582a6017064 100644
--- a/src/cdk/portal/portal.ts
+++ b/src/cdk/portal/portal.ts
@@ -138,7 +138,7 @@ export class TemplatePortal<C = any> extends Portal<C> {
   }
 
   /**
-   * Attach the the portal to the provided `PortalOutlet`.
+   * Attach the portal to the provided `PortalOutlet`.
    * When a context is provided it will override the `context` property of the `TemplatePortal`
    * instance.
    */
diff --git a/src/dev-app/chips/chips-demo.html b/src/dev-app/chips/chips-demo.html
index f87ec36b736..7de13edd78d 100644
--- a/src/dev-app/chips/chips-demo.html
+++ b/src/dev-app/chips/chips-demo.html
@@ -91,7 +91,7 @@
       <h4>Form Field</h4>
 
       <p>
-        You can easily put the the <code>&lt;mat-chip-list&gt;</code> inside of an
+        You can easily put the <code>&lt;mat-chip-list&gt;</code> inside of an
         <code>&lt;mat-form-field&gt;</code>.
       </p>
 
diff --git a/src/lib/button-toggle/button-toggle.md b/src/lib/button-toggle/button-toggle.md
index 6c0f5bcbdf9..23905e817dc 100644
--- a/src/lib/button-toggle/button-toggle.md
+++ b/src/lib/button-toggle/button-toggle.md
@@ -11,7 +11,7 @@ In this mode, the `value` of the `mat-button-toggle-group` will reflect the valu
 button and `ngModel` is supported.
 
 Adding the `multiple` attribute allows multiple items to be selected (checkbox behavior). In this
-mode the values of the the toggles are not used, the `mat-button-toggle-group` does not have a value,
+mode the values of the toggles are not used, the `mat-button-toggle-group` does not have a value, 
 and `ngModel` is not supported.
 
 ### Appearance
diff --git a/src/lib/chips/chip-list.ts b/src/lib/chips/chip-list.ts
index d7959287140..359dec69ff9 100644
--- a/src/lib/chips/chip-list.ts
+++ b/src/lib/chips/chip-list.ts
@@ -450,7 +450,7 @@ export class MatChipList extends _MatChipListMixinBase implements MatFormFieldCo
   }
 
   /**
-   * Focuses the the first non-disabled chip in this chip list, or the associated input when there
+   * Focuses the first non-disabled chip in this chip list, or the associated input when there
    * are no eligible chips.
    */
   focus(): void {
diff --git a/src/lib/core/ripple/ripple.ts b/src/lib/core/ripple/ripple.ts
index 2dd3053d5a1..770d0c58e4f 100644
--- a/src/lib/core/ripple/ripple.ts
+++ b/src/lib/core/ripple/ripple.ts
@@ -167,7 +167,7 @@ export class MatRipple implements OnInit, OnDestroy, RippleTarget {
     return this.disabled || !!this._globalOptions.disabled;
   }
 
-  /** Sets up the the trigger event listeners if ripples are enabled. */
+  /** Sets up the trigger event listeners if ripples are enabled. */
   private _setupTriggerEventsIfEnabled() {
     if (!this.disabled && this._isInitialized) {
       this._rippleRenderer.setupTriggerEvents(this.trigger);
diff --git a/src/lib/datepicker/calendar.ts b/src/lib/datepicker/calendar.ts
index dbb1241aaf4..aab415a2a32 100644
--- a/src/lib/datepicker/calendar.ts
+++ b/src/lib/datepicker/calendar.ts
@@ -82,7 +82,7 @@ export class MatCalendarHeader<D> {
         this._intl.switchToMultiYearViewLabel : this._intl.switchToMonthViewLabel;
   }
 
-  /** The label for the the previous button. */
+  /** The label for the previous button. */
   get prevButtonLabel(): string {
     return {
       'month': this._intl.prevMonthLabel,
@@ -91,7 +91,7 @@ export class MatCalendarHeader<D> {
     }[this.calendar.currentView];
   }
 
-  /** The label for the the next button. */
+  /** The label for the next button. */
   get nextButtonLabel(): string {
     return {
       'month': this._intl.nextMonthLabel,
diff --git a/src/lib/form-field/prefix.ts b/src/lib/form-field/prefix.ts
index 29574d57047..46e3b4cadfa 100644
--- a/src/lib/form-field/prefix.ts
+++ b/src/lib/form-field/prefix.ts
@@ -9,7 +9,7 @@
 import {Directive} from '@angular/core';
 
 
-/** Prefix to be placed the the front of the form field. */
+/** Prefix to be placed in front of the form field. */
 @Directive({
   selector: '[matPrefix]',
 })