diff --git a/field/_filled-field.scss b/field/_filled-field.scss
index c385e16f1a..8d99af479d 100644
--- a/field/_filled-field.scss
+++ b/field/_filled-field.scss
@@ -3,4 +3,4 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-@forward './lib/filled-field' show theme;
+@forward './internal/filled-field' show theme;
diff --git a/field/_outlined-field.scss b/field/_outlined-field.scss
index 7f71fea499..6e6669c214 100644
--- a/field/_outlined-field.scss
+++ b/field/_outlined-field.scss
@@ -3,4 +3,4 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-@forward './lib/outlined-field' show theme;
+@forward './internal/outlined-field' show theme;
diff --git a/field/filled-field.ts b/field/filled-field.ts
index 2120a93f95..5fd4aa01c7 100644
--- a/field/filled-field.ts
+++ b/field/filled-field.ts
@@ -6,9 +6,9 @@
 
 import {customElement} from 'lit/decorators.js';
 
-import {FilledField} from './lib/filled-field.js';
-import {styles as filledStyles} from './lib/filled-styles.css.js';
-import {styles as sharedStyles} from './lib/shared-styles.css.js';
+import {FilledField} from './internal/filled-field.js';
+import {styles as filledStyles} from './internal/filled-styles.css.js';
+import {styles as sharedStyles} from './internal/shared-styles.css.js';
 
 declare global {
   interface HTMLElementTagNameMap {
diff --git a/field/harness.ts b/field/harness.ts
index cbfc42c801..5b6e6c7735 100644
--- a/field/harness.ts
+++ b/field/harness.ts
@@ -6,7 +6,7 @@
 
 import {Harness} from '../testing/harness.js';
 
-import {Field} from './lib/field.js';
+import {Field} from './internal/field.js';
 
 /**
  * Test harness for field elements.
diff --git a/field/lib/_content.scss b/field/internal/_content.scss
similarity index 100%
rename from field/lib/_content.scss
rename to field/internal/_content.scss
diff --git a/field/lib/_filled-field.scss b/field/internal/_filled-field.scss
similarity index 100%
rename from field/lib/_filled-field.scss
rename to field/internal/_filled-field.scss
diff --git a/field/lib/_label.scss b/field/internal/_label.scss
similarity index 100%
rename from field/lib/_label.scss
rename to field/internal/_label.scss
diff --git a/field/lib/_outlined-field.scss b/field/internal/_outlined-field.scss
similarity index 100%
rename from field/lib/_outlined-field.scss
rename to field/internal/_outlined-field.scss
diff --git a/field/lib/_shared.scss b/field/internal/_shared.scss
similarity index 100%
rename from field/lib/_shared.scss
rename to field/internal/_shared.scss
diff --git a/field/lib/_supporting-text.scss b/field/internal/_supporting-text.scss
similarity index 100%
rename from field/lib/_supporting-text.scss
rename to field/internal/_supporting-text.scss
diff --git a/field/lib/field.ts b/field/internal/field.ts
similarity index 100%
rename from field/lib/field.ts
rename to field/internal/field.ts
diff --git a/field/lib/field_test.ts b/field/internal/field_test.ts
similarity index 100%
rename from field/lib/field_test.ts
rename to field/internal/field_test.ts
diff --git a/field/lib/filled-field.ts b/field/internal/filled-field.ts
similarity index 100%
rename from field/lib/filled-field.ts
rename to field/internal/filled-field.ts
diff --git a/field/lib/filled-styles.scss b/field/internal/filled-styles.scss
similarity index 100%
rename from field/lib/filled-styles.scss
rename to field/internal/filled-styles.scss
diff --git a/field/lib/outlined-field.ts b/field/internal/outlined-field.ts
similarity index 100%
rename from field/lib/outlined-field.ts
rename to field/internal/outlined-field.ts
diff --git a/field/lib/outlined-styles.scss b/field/internal/outlined-styles.scss
similarity index 100%
rename from field/lib/outlined-styles.scss
rename to field/internal/outlined-styles.scss
diff --git a/field/lib/shared-styles.scss b/field/internal/shared-styles.scss
similarity index 100%
rename from field/lib/shared-styles.scss
rename to field/internal/shared-styles.scss
diff --git a/field/outlined-field.ts b/field/outlined-field.ts
index df2dee76d4..f7b68d320a 100644
--- a/field/outlined-field.ts
+++ b/field/outlined-field.ts
@@ -6,9 +6,9 @@
 
 import {customElement} from 'lit/decorators.js';
 
-import {OutlinedField} from './lib/outlined-field.js';
-import {styles as outlinedStyles} from './lib/outlined-styles.css.js';
-import {styles as sharedStyles} from './lib/shared-styles.css.js';
+import {OutlinedField} from './internal/outlined-field.js';
+import {styles as outlinedStyles} from './internal/outlined-styles.css.js';
+import {styles as sharedStyles} from './internal/shared-styles.css.js';
 
 declare global {
   interface HTMLElementTagNameMap {
diff --git a/select/harness.ts b/select/harness.ts
index f35703763a..8f2bce1ef1 100644
--- a/select/harness.ts
+++ b/select/harness.ts
@@ -7,7 +7,7 @@
 import {LitElement} from 'lit';
 
 import {FieldHarness} from '../field/harness.js';
-import {Field} from '../field/lib/field.js';
+import {Field} from '../field/internal/field.js';
 import {Harness} from '../testing/harness.js';
 
 import {Select} from './lib/select.js';
diff --git a/select/lib/select.ts b/select/lib/select.ts
index ecca693f82..f0ddb9f3e6 100644
--- a/select/lib/select.ts
+++ b/select/lib/select.ts
@@ -11,7 +11,7 @@ import {property, query, queryAssignedElements, state} from 'lit/decorators.js';
 import {classMap} from 'lit/directives/class-map.js';
 import {html as staticHtml, StaticValue} from 'lit/static-html.js';
 
-import {Field} from '../../field/lib/field.js';
+import {Field} from '../../field/internal/field.js';
 import {List} from '../../list/lib/list.js';
 import {DEFAULT_TYPEAHEAD_BUFFER_TIME, Menu} from '../../menu/lib/menu.js';
 import {DefaultCloseMenuEvent, isElementInSubtree, isSelectableKey} from '../../menu/lib/shared.js';
diff --git a/textfield/lib/text-field.ts b/textfield/lib/text-field.ts
index 02322235e9..67f9f17f40 100644
--- a/textfield/lib/text-field.ts
+++ b/textfield/lib/text-field.ts
@@ -11,7 +11,7 @@ import {live} from 'lit/directives/live.js';
 import {styleMap} from 'lit/directives/style-map.js';
 import {html as staticHtml, StaticValue} from 'lit/static-html.js';
 
-import {Field} from '../../field/lib/field.js';
+import {Field} from '../../field/internal/field.js';
 import {ARIAMixinStrict} from '../../internal/aria/aria.js';
 import {requestUpdateOnAriaChange} from '../../internal/aria/delegate.js';
 import {redispatchEvent} from '../../internal/controller/events.js';