diff --git a/apps/api/src/index.ts b/apps/api/src/index.ts
index c940e0d..e53c365 100644
--- a/apps/api/src/index.ts
+++ b/apps/api/src/index.ts
@@ -6,6 +6,7 @@ import { clientsRouter } from "./routes/clients.js";
 import { petsRouter } from "./routes/pets.js";
 import { servicesRouter } from "./routes/services.js";
 import { appointmentsRouter } from "./routes/appointments.js";
+import { waitlistRouter } from "./routes/waitlist.js";
 import { portalRouter } from "./routes/portal.js";
 import { staffRouter } from "./routes/staff.js";
 import { invoicesRouter } from "./routes/invoices.js";
@@ -109,6 +110,7 @@ api.route("/pets", petsRouter);
 api.route("/services", servicesRouter);
 api.route("/appointments", appointmentsRouter);
 api.route("/portal", portalRouter);
+api.route("/waitlist", waitlistRouter);
 api.route("/staff", staffRouter);
 api.route("/invoices", invoicesRouter);
 api.route("/reports", reportsRouter);
diff --git a/apps/api/src/routes/waitlist.ts b/apps/api/src/routes/waitlist.ts
new file mode 100644
index 0000000..abb7697
--- /dev/null
+++ b/apps/api/src/routes/waitlist.ts
@@ -0,0 +1,198 @@
+import { Hono } from "hono";
+import { zValidator } from "@hono/zod-validator";
+import { z } from "zod";
+import {
+  and,
+  eq,
+  getDb,
+  waitlistEntries,
+  clients,
+  pets,
+  services,
+  impersonationSessions,
+} from "@groombook/db";
+import type { AppEnv } from "../middleware/rbac.js";
+
+export const waitlistRouter = new Hono<AppEnv>();
+
+const waitlistStatusEnum = z.enum(["active", "notified", "expired", "cancelled"]);
+
+const createWaitlistEntrySchema = z.object({
+  petId: z.string().uuid(),
+  serviceId: z.string().uuid(),
+  preferredDate: z.string(),
+  preferredTime: z.string(),
+});
+
+const updateWaitlistEntrySchema = z.object({
+  status: waitlistStatusEnum.optional(),
+  preferredDate: z.string().optional(),
+  preferredTime: z.string().optional(),
+});
+
+waitlistRouter.get("/", async (c) => {
+  const db = getDb();
+  const date = c.req.query("date");
+
+  const conditions = [];
+  if (date) {
+    conditions.push(eq(waitlistEntries.preferredDate, date));
+  }
+
+  const rows =
+    conditions.length > 0
+      ? await db
+          .select()
+          .from(waitlistEntries)
+          .where(and(...conditions))
+          .orderBy(waitlistEntries.createdAt)
+      : await db
+          .select()
+          .from(waitlistEntries)
+          .orderBy(waitlistEntries.createdAt);
+
+  const enriched = await Promise.all(
+    rows.map(async (entry) => {
+      const [client] = await db
+        .select({ name: clients.name, email: clients.email })
+        .from(clients)
+        .where(eq(clients.id, entry.clientId))
+        .limit(1);
+      const [pet] = await db
+        .select({ name: pets.name })
+        .from(pets)
+        .where(eq(pets.id, entry.petId))
+        .limit(1);
+      const [service] = await db
+        .select({ name: services.name })
+        .from(services)
+        .where(eq(services.id, entry.serviceId))
+        .limit(1);
+      return {
+        ...entry,
+        clientName: client?.name ?? null,
+        clientEmail: client?.email ?? null,
+        petName: pet?.name ?? null,
+        serviceName: service?.name ?? null,
+      };
+    })
+  );
+
+  return c.json(enriched);
+});
+
+waitlistRouter.get("/:id", async (c) => {
+  const db = getDb();
+  const [row] = await db
+    .select()
+    .from(waitlistEntries)
+    .where(eq(waitlistEntries.id, c.req.param("id")))
+    .limit(1);
+  if (!row) return c.json({ error: "Not found" }, 404);
+  return c.json(row);
+});
+
+waitlistRouter.post(
+  "/",
+  zValidator("json", createWaitlistEntrySchema),
+  async (c) => {
+    const db = getDb();
+    const body = c.req.valid("json");
+    const sessionId = c.req.header("X-Impersonation-Session-Id");
+
+    let clientId: string | null = null;
+    if (sessionId) {
+      const [session] = await db
+        .select()
+        .from(impersonationSessions)
+        .where(
+          and(
+            eq(impersonationSessions.id, sessionId),
+            eq(impersonationSessions.status, "active")
+          )
+        )
+        .limit(1);
+      if (session && session.expiresAt > new Date()) {
+        clientId = session.clientId;
+      }
+    }
+
+    if (!clientId) {
+      return c.json({ error: "Unauthorized" }, 401);
+    }
+
+    const [entry] = await db
+      .insert(waitlistEntries)
+      .values({
+        clientId,
+        petId: body.petId,
+        serviceId: body.serviceId,
+        preferredDate: body.preferredDate,
+        preferredTime: body.preferredTime,
+      })
+      .returning();
+
+    return c.json(entry, 201);
+  }
+);
+
+waitlistRouter.patch(
+  "/:id",
+  zValidator("json", updateWaitlistEntrySchema),
+  async (c) => {
+    const db = getDb();
+    const id = c.req.param("id");
+    const body = c.req.valid("json");
+
+    const updateData: Record<string, unknown> = { updatedAt: new Date() };
+    if (body.status !== undefined) updateData.status = body.status;
+    if (body.preferredDate !== undefined) updateData.preferredDate = body.preferredDate;
+    if (body.preferredTime !== undefined) updateData.preferredTime = body.preferredTime;
+
+    const [updated] = await db
+      .update(waitlistEntries)
+      .set(updateData)
+      .where(eq(waitlistEntries.id, id))
+      .returning();
+
+    if (!updated) return c.json({ error: "Not found" }, 404);
+    return c.json(updated);
+  }
+);
+
+waitlistRouter.delete("/:id", async (c) => {
+  const db = getDb();
+  const id = c.req.param("id");
+  const sessionId = c.req.header("X-Impersonation-Session-Id");
+
+  if (sessionId) {
+    const [session] = await db
+      .select()
+      .from(impersonationSessions)
+      .where(
+        and(
+          eq(impersonationSessions.id, sessionId),
+          eq(impersonationSessions.status, "active")
+        )
+      )
+      .limit(1);
+    if (session && session.expiresAt > new Date()) {
+      const [entry] = await db
+        .select()
+        .from(waitlistEntries)
+        .where(eq(waitlistEntries.id, id))
+        .limit(1);
+      if (entry && entry.clientId !== session.clientId) {
+        return c.json({ error: "Forbidden" }, 403);
+      }
+    }
+  }
+
+  const [deleted] = await db
+    .delete(waitlistEntries)
+    .where(eq(waitlistEntries.id, id))
+    .returning();
+
+  if (!deleted) return c.json({ error: "Not found" }, 404);
+  return c.json({ ok: true });
+});
diff --git a/packages/db/migrations/0015_waitlist.sql b/packages/db/migrations/0015_waitlist.sql
new file mode 100644
index 0000000..fcbc6a7
--- /dev/null
+++ b/packages/db/migrations/0015_waitlist.sql
@@ -0,0 +1,18 @@
+CREATE TABLE waitlist_entries (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  client_id UUID NOT NULL REFERENCES clients(id) ON DELETE CASCADE,
+  pet_id UUID NOT NULL REFERENCES pets(id) ON DELETE CASCADE,
+  service_id UUID NOT NULL REFERENCES services(id) ON DELETE CASCADE,
+  preferred_date DATE NOT NULL,
+  preferred_time TIME NOT NULL,
+  status TEXT NOT NULL DEFAULT 'active',
+  notified_at TIMESTAMPTZ,
+  expires_at TIMESTAMPTZ,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_waitlist_client_id ON waitlist_entries (client_id);
+CREATE INDEX idx_waitlist_preferred_date ON waitlist_entries (preferred_date);
+CREATE INDEX idx_waitlist_status ON waitlist_entries (status) WHERE status = 'active';
+CREATE UNIQUE INDEX idx_waitlist_active_unique ON waitlist_entries (client_id, pet_id, service_id, preferred_date, preferred_time) WHERE status = 'active';
diff --git a/packages/db/src/schema.ts b/packages/db/src/schema.ts
index b719b92..676602b 100644
--- a/packages/db/src/schema.ts
+++ b/packages/db/src/schema.ts
@@ -312,3 +312,38 @@ export const groomingVisitLogs = pgTable("grooming_visit_logs", {
   groomedAt: timestamp("groomed_at").notNull().defaultNow(),
   createdAt: timestamp("created_at").notNull().defaultNow(),
 });
+
+export const waitlistStatusEnum = pgEnum("waitlist_status", [
+  "active",
+  "notified",
+  "expired",
+  "cancelled",
+]);
+
+export const waitlistEntries = pgTable(
+  "waitlist_entries",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    clientId: uuid("client_id")
+      .notNull()
+      .references(() => clients.id, { onDelete: "cascade" }),
+    petId: uuid("pet_id")
+      .notNull()
+      .references(() => pets.id, { onDelete: "cascade" }),
+    serviceId: uuid("service_id")
+      .notNull()
+      .references(() => services.id, { onDelete: "cascade" }),
+    preferredDate: text("preferred_date").notNull(),
+    preferredTime: text("preferred_time").notNull(),
+    status: waitlistStatusEnum("status").notNull().default("active"),
+    notifiedAt: timestamp("notified_at"),
+    expiresAt: timestamp("expires_at"),
+    createdAt: timestamp("created_at").notNull().defaultNow(),
+    updatedAt: timestamp("updated_at").notNull().defaultNow(),
+  },
+  (t) => [
+    index("idx_waitlist_client_id").on(t.clientId),
+    index("idx_waitlist_preferred_date").on(t.preferredDate),
+    index("idx_waitlist_status").on(t.status),
+  ]
+);