diff --git a/src/lib/i18n/en.ts b/src/lib/i18n/en.ts
index b56e07b..e0fe7a8 100644
--- a/src/lib/i18n/en.ts
+++ b/src/lib/i18n/en.ts
@@ -124,6 +124,9 @@ export const en: Messages = {
 		heading: "Create a Wiki",
 		name: "Name",
 		namePlaceholder: "My Wiki",
+		slug: "URL slug",
+		slugHint: "Optional. Defaults to the name. Used in the wiki's address.",
+		slugPlaceholder: "my-wiki",
 		description: "Description",
 		descriptionPlaceholder: "What is this wiki about?",
 		language: "Language",
@@ -223,6 +226,10 @@ export const en: Messages = {
 		routeNotFound: "This page doesn't exist.",
 		wikiNameRequired: "Wiki name is required.",
 		wikiSlugExists: 'A wiki with slug "{slug}" already exists.',
+		wikiSlugRequired:
+			"That name can't be turned into a URL. Please choose a URL slug (letters a-z, numbers and hyphens).",
+		wikiSlugInvalid:
+			'"{slug}" can\'t be used as a URL slug. Use letters a-z, numbers and hyphens.',
 		wikiLanguageRequired: "Language is required.",
 		wikiLanguageInvalid:
 			"Language must be a valid BCP-47 tag (e.g. en, pt-BR).",
diff --git a/src/lib/i18n/fr.ts b/src/lib/i18n/fr.ts
index b885784..189f8cb 100644
--- a/src/lib/i18n/fr.ts
+++ b/src/lib/i18n/fr.ts
@@ -126,6 +126,10 @@ export const fr: PartialMessages = {
 		heading: "Créer un wiki",
 		name: "Nom",
 		namePlaceholder: "Mon wiki",
+		slug: "Slug d'URL",
+		slugHint:
+			"Facultatif. Dérivé du nom par défaut. Utilisé dans l'adresse du wiki.",
+		slugPlaceholder: "mon-wiki",
 		description: "Description",
 		descriptionPlaceholder: "De quoi parle ce wiki ?",
 		language: "Langue",
@@ -226,6 +230,10 @@ export const fr: PartialMessages = {
 		routeNotFound: "Cette page n'existe pas.",
 		wikiNameRequired: "Le nom du wiki est requis.",
 		wikiSlugExists: 'Un wiki avec le slug "{slug}" existe déjà.',
+		wikiSlugRequired:
+			"Ce nom ne peut pas être transformé en URL. Choisissez un slug (lettres a-z, chiffres et tirets).",
+		wikiSlugInvalid:
+			'"{slug}" ne peut pas servir de slug d\'URL. Utilisez des lettres a-z, des chiffres et des tirets.',
 		wikiLanguageRequired: "La langue est requise.",
 		wikiLanguageInvalid:
 			"La langue doit être une étiquette BCP-47 valide (p. ex. en, pt-BR).",
diff --git a/src/lib/i18n/index.ts b/src/lib/i18n/index.ts
index d90e5be..8f637dc 100644
--- a/src/lib/i18n/index.ts
+++ b/src/lib/i18n/index.ts
@@ -122,6 +122,9 @@ export interface Messages {
 		heading: string;
 		name: string;
 		namePlaceholder: string;
+		slug: string;
+		slugHint: string;
+		slugPlaceholder: string;
 		description: string;
 		descriptionPlaceholder: string;
 		language: string;
@@ -216,6 +219,8 @@ export interface Messages {
 		routeNotFound: string;
 		wikiNameRequired: string;
 		wikiSlugExists: string;
+		wikiSlugRequired: string;
+		wikiSlugInvalid: string;
 		wikiLanguageRequired: string;
 		wikiLanguageInvalid: string;
 		wikiNameTooLong: string;
diff --git a/src/lib/i18n/ja.ts b/src/lib/i18n/ja.ts
index 83c719f..788b414 100644
--- a/src/lib/i18n/ja.ts
+++ b/src/lib/i18n/ja.ts
@@ -129,6 +129,10 @@ export const ja: PartialMessages = {
 		heading: "Wiki を作成",
 		name: "名前",
 		namePlaceholder: "My Wiki",
+		slug: "URL スラッグ",
+		slugHint:
+			"任意。未入力の場合は名前から生成されます。Wiki のアドレスに使われます。",
+		slugPlaceholder: "my-wiki",
 		description: "説明",
 		descriptionPlaceholder: "この Wiki はどんな内容ですか？",
 		language: "言語",
@@ -227,6 +231,10 @@ export const ja: PartialMessages = {
 		routeNotFound: "このページは存在しません。",
 		wikiNameRequired: "Wiki 名を入力してください。",
 		wikiSlugExists: "スラッグ「{slug}」の Wiki はすでに存在します。",
+		wikiSlugRequired:
+			"この名前は URL に変換できません。URL スラッグ（英小文字・数字・ハイフン）を入力してください。",
+		wikiSlugInvalid:
+			"「{slug}」は URL スラッグとして使用できません。英小文字・数字・ハイフンを使用してください。",
 		wikiLanguageRequired: "言語を選択してください。",
 		wikiLanguageInvalid:
 			"言語は有効な BCP-47 タグである必要があります（例: en、pt-BR）。",
diff --git a/src/lib/orchestrators/wiki.ts b/src/lib/orchestrators/wiki.ts
index ea4ccb3..a71727d 100644
--- a/src/lib/orchestrators/wiki.ts
+++ b/src/lib/orchestrators/wiki.ts
@@ -38,6 +38,8 @@ export interface WikiFormFields {
 	language: string;
 	visibility: string;
 	description: string;
+	/** Optional URL slug. Derived from the name when empty. */
+	slug?: string;
 }
 
 // Theme name when enforced; undefined in reader mode so the PDS record omits the field.
@@ -82,11 +84,18 @@ export async function createWikiCore(
 		throw new ValidationError(msg.error.wikiLanguageInvalid);
 	}
 
-	const slug = slugify(fields.name);
+	// The slug is this record's rkey, and the atproto rkey charset is ASCII-only,
+	// so it can't follow the name into Unicode the way a note slug can. Names that
+	// don't transliterate (Japanese, Korean, Chinese) yield "" here, which used to
+	// be a dead end — now the form can supply one instead.
+	const requested = fields.slug?.trim();
+	const slug = slugify(requested || fields.name);
 
 	if (!isValidSlug(slug)) {
 		throw new ValidationError(
-			fmt(msg.error.invalidSlug, { title: fields.name }),
+			requested
+				? fmt(msg.error.wikiSlugInvalid, { slug: requested })
+				: msg.error.wikiSlugRequired,
 		);
 	}
 
diff --git a/src/server/routes/wiki.ts b/src/server/routes/wiki.ts
index 7d3bae6..deccb18 100644
--- a/src/server/routes/wiki.ts
+++ b/src/server/routes/wiki.ts
@@ -118,6 +118,7 @@ export const wikiCreationRoutes = new Elysia({ prefix: "/wiki" })
 		const visibility =
 			(formData.get("visibility") as string | null) ?? "public";
 		const description = (formData.get("description") as string | null) ?? "";
+		const slug = (formData.get("slug") as string | null) ?? "";
 		const zipFile = formData.get("zipFile");
 
 		const renderError = (error: string) =>
@@ -126,6 +127,7 @@ export const wikiCreationRoutes = new Elysia({ prefix: "/wiki" })
 					...baseLayoutOptions(ctx),
 					error,
 					nameValue: name,
+					slugValue: slug,
 					languageValue: language,
 					visibilityValue: visibility,
 					descriptionValue: description,
@@ -142,7 +144,7 @@ export const wikiCreationRoutes = new Elysia({ prefix: "/wiki" })
 				const zipBuffer = await zipFile.arrayBuffer();
 				const { wikiSlug } = await importWikiAction(
 					ctx,
-					{ name, language, visibility, description, zipBuffer },
+					{ name, language, visibility, description, slug, zipBuffer },
 					msg,
 				);
 				return redirect(wikiUrl(ctx.session.handle, wikiSlug));
@@ -150,7 +152,7 @@ export const wikiCreationRoutes = new Elysia({ prefix: "/wiki" })
 
 			const { wikiSlug } = await createWikiAction(
 				ctx,
-				{ name, language, visibility, description },
+				{ name, language, visibility, description, slug },
 				msg,
 			);
 			return redirect(wikiUrl(ctx.session.handle, wikiSlug));
diff --git a/src/views/new-wiki.ts b/src/views/new-wiki.ts
index 4437b5d..db80adf 100644
--- a/src/views/new-wiki.ts
+++ b/src/views/new-wiki.ts
@@ -13,6 +13,7 @@ import {
 interface NewWikiOptions extends LayoutOptions {
 	error?: string;
 	nameValue?: string;
+	slugValue?: string;
 	descriptionValue?: string;
 	languageValue?: string;
 	visibilityValue?: string;
@@ -25,6 +26,7 @@ export function newWikiPage(options?: NewWikiOptions): string {
 	const errorHtml = errorBanner(options?.error);
 
 	const nameValue = escapeHtml(options?.nameValue ?? "");
+	const slugValue = escapeHtml(options?.slugValue ?? "");
 	const descriptionValue = escapeHtml(options?.descriptionValue ?? "");
 	const selectedLang = options?.languageValue ?? "";
 	const selectedVis = options?.visibilityValue ?? "public";
@@ -59,6 +61,18 @@ export function newWikiPage(options?: NewWikiOptions): string {
           placeholder="${msg.createWiki.namePlaceholder}"
         >
       </div>
+      <div>
+        <label for="slug" class="block text-sm font-medium ${THEME.textSecondary} mb-1">${msg.createWiki.slug}</label>
+        <input
+          id="slug"
+          name="slug"
+          type="text"
+          value="${slugValue}"
+          class="${inputClass}"
+          placeholder="${msg.createWiki.slugPlaceholder}"
+        >
+        <p class="mt-1 text-xs ${THEME.textMuted}">${msg.createWiki.slugHint}</p>
+      </div>
       <div>
         <label for="description" class="block text-sm font-medium ${THEME.textSecondary} mb-1">${msg.createWiki.description}</label>
         <textarea
diff --git a/tests/lib/orchestrators/wiki.test.ts b/tests/lib/orchestrators/wiki.test.ts
index 836bb06..90a82fe 100644
--- a/tests/lib/orchestrators/wiki.test.ts
+++ b/tests/lib/orchestrators/wiki.test.ts
@@ -59,6 +59,8 @@ const dummyMsg = {
 		wikiLanguageRequired: "Language required",
 		invalidSlug: "Invalid slug: {title}",
 		wikiSlugExists: "Slug exists: {slug}",
+		wikiSlugRequired: "Slug required",
+		wikiSlugInvalid: "Slug invalid: {slug}",
 		wikiNameTooLong: "Too long (max {max})",
 		invalidThemeMode: "Invalid theme mode",
 		invalidTheme: "Invalid theme",
@@ -488,3 +490,79 @@ describe("editWikiAction", () => {
 		).rejects.toBeInstanceOf(ValidationError);
 	});
 });
+
+// The wiki slug is this record's rkey, so it can't follow the name into Unicode
+// the way a note slug can. A name that won't transliterate used to be a dead end.
+describe("createWikiAction with a non-transliterating name", () => {
+	test("rejects a japanese name with no slug, asking for one", async () => {
+		await expect(
+			createWikiAction(
+				makeCtx(),
+				{
+					name: "日本語ウィキ",
+					language: "ja",
+					visibility: "public",
+					description: "",
+				},
+				dummyMsg,
+			),
+		).rejects.toThrow("Slug required");
+	});
+
+	test("accepts a japanese name when a slug is supplied", async () => {
+		// at_uri is UNIQUE and the shared mock returns a fixed one.
+		mockWriteWikiRecord.mockResolvedValueOnce({
+			uri: "at://did:plc:wikitest/wiki.lichen.wiki/nihongo-wiki-orch",
+			cid: "bafyreiJP1",
+		});
+		const result = await createWikiAction(
+			makeCtx(),
+			{
+				name: "日本語ウィキ",
+				language: "ja",
+				visibility: "public",
+				description: "",
+				slug: "nihongo-wiki-orch",
+			},
+			dummyMsg,
+		);
+		expect(result.wikiSlug).toBe("nihongo-wiki-orch");
+		createdSlugs.push("nihongo-wiki-orch");
+	});
+
+	test("slugifies a supplied slug rather than trusting it", async () => {
+		mockWriteWikiRecord.mockResolvedValueOnce({
+			uri: "at://did:plc:wikitest/wiki.lichen.wiki/nihongo-wiki-orch2",
+			cid: "bafyreiJP2",
+		});
+		const result = await createWikiAction(
+			makeCtx(),
+			{
+				name: "日本語ウィキ",
+				language: "ja",
+				visibility: "public",
+				description: "",
+				slug: "Nihongo Wiki Orch2",
+			},
+			dummyMsg,
+		);
+		expect(result.wikiSlug).toBe("nihongo-wiki-orch2");
+		createdSlugs.push("nihongo-wiki-orch2");
+	});
+
+	test("rejects a supplied slug that cannot become one", async () => {
+		await expect(
+			createWikiAction(
+				makeCtx(),
+				{
+					name: "日本語ウィキ",
+					language: "ja",
+					visibility: "public",
+					description: "",
+					slug: "日本語",
+				},
+				dummyMsg,
+			),
+		).rejects.toThrow("Slug invalid: 日本語");
+	});
+});