diff --git a/.changeset/select-ime-enter-keycode-229.md b/.changeset/select-ime-enter-keycode-229.md
new file mode 100644
index 000000000..150b22e42
--- /dev/null
+++ b/.changeset/select-ime-enter-keycode-229.md
@@ -0,0 +1,5 @@
+---
+"bits-ui": patch
+---
+
+fix(Select): don't commit the highlighted item on an IME composition-commit Enter in Safari (`keyCode === 229`), matching the guard already used in Command. This also fixes Combobox, which shares the same input keydown handler.
diff --git a/packages/bits-ui/src/lib/bits/select/select.svelte.ts b/packages/bits-ui/src/lib/bits/select/select.svelte.ts
index 508f904b4..02f79bb00 100644
--- a/packages/bits-ui/src/lib/bits/select/select.svelte.ts
+++ b/packages/bits-ui/src/lib/bits/select/select.svelte.ts
@@ -565,7 +565,10 @@ export class SelectInputState {
 			return;
 		}
 
-		if (e.key === kbd.ENTER && !e.isComposing) {
+		// `e.keyCode === 229` covers Safari + Japanese IME, where `isComposing` is not
+		// set while composing, so an IME-commit Enter would otherwise select an item.
+		// Mirrors the Enter guard in `command.svelte.ts`.
+		if (e.key === kbd.ENTER && !e.isComposing && e.keyCode !== 229) {
 			e.preventDefault();
 
 			const isCurrentSelectedValue =
diff --git a/tests/src/tests/combobox/combobox.browser.test.ts b/tests/src/tests/combobox/combobox.browser.test.ts
index 258b4d25e..9f87b822f 100644
--- a/tests/src/tests/combobox/combobox.browser.test.ts
+++ b/tests/src/tests/combobox/combobox.browser.test.ts
@@ -186,6 +186,31 @@ describe("combobox - single", () => {
 		await expect.element(page.getByTestId("input")).toHaveValue("B");
 	});
 
+	it("should not select an item on enter while composing with an IME (keyCode 229)", async () => {
+		await openSingle();
+		await expect.element(page.getByTestId("input")).toHaveFocus();
+		await userEvent.keyboard(kbd.ARROW_DOWN);
+		await expect.element(page.getByTestId("2")).toHaveAttribute("data-highlighted");
+
+		// Safari + Japanese IME deliver the composition-commit Enter with `keyCode === 229`
+		// and `isComposing === false`, so it must not commit the highlighted item.
+		page.getByTestId("input").element().dispatchEvent(
+			new KeyboardEvent("keydown", {
+				key: "Enter",
+				keyCode: 229,
+				bubbles: true,
+				cancelable: true,
+			})
+		);
+		await tick();
+		await expect.element(page.getByTestId("content")).toBeVisible();
+		await expect.element(page.getByTestId("input")).not.toHaveValue("B");
+
+		// a normal Enter (keyCode 13, not composing) still commits the selection
+		await userEvent.keyboard(kbd.ENTER);
+		await expect.element(page.getByTestId("input")).toHaveValue("B");
+	});
+
 	it("should render an input if the `name` prop is passed", async () => {
 		const t = setupSingle();
 		await expect.element(t.getHiddenInput()).toBeInTheDocument();