diff --git a/app/pages/bookings/index.vue b/app/pages/bookings/index.vue
index 16096c1..3078ad6 100644
--- a/app/pages/bookings/index.vue
+++ b/app/pages/bookings/index.vue
@@ -302,6 +302,17 @@
                   icon="i-lucide-receipt"
                   size="sm"
                 />
+                <UButton
+                  v-if="row.original.status === 'confirmed'"
+                  label="Unconfirm"
+                  color="error"
+                  variant="outline"
+                  icon="i-lucide-x-circle"
+                  size="sm"
+                  :loading="cancellingBookingId === row.original.id"
+                  :disabled="cancellingBookingId !== null && cancellingBookingId !== row.original.id"
+                  @click="cancelBookingConfirmation(row.original)"
+                />
               </div>
             </template>
           </UTable>
@@ -365,7 +376,7 @@
 </template>
 
 <script lang="ts" setup>
-import type { BookingCapacitySettings, BookingInventorySummary, PublicBooking } from '~~/shared/booking'
+import type { BookingCapacitySettings, BookingInventorySummary, CancelBookingConfirmationResponse, PublicBooking } from '~~/shared/booking'
 
 import {
   formatBookingCurrency,
@@ -387,6 +398,7 @@ const bookings = ref<PublicBooking[]>([])
 const loadingBookings = ref(false)
 const savingCapacity = ref(false)
 const savingRemark = ref(false)
+const cancellingBookingId = ref<string | null>(null)
 const remarkModalOpen = ref(false)
 const editingBooking = ref<PublicBooking | null>(null)
 const searchQuery = ref('')
@@ -528,6 +540,12 @@ function replaceBooking(updatedBooking: PublicBooking) {
   bookings.value.splice(index, 1, updatedBooking)
 }
 
+function applyCancelledConfirmationToSummary(booking: PublicBooking) {
+  summary.soldSeats = Math.max(summary.soldSeats - booking.seatCount, 0)
+  summary.pendingSeats += booking.seatCount
+  summary.leftSeats = summary.totalSeats === null ? null : Math.max(summary.totalSeats - summary.soldSeats, 0)
+}
+
 function openRemarkEditor(booking: PublicBooking) {
   editingBooking.value = booking
   remarkForm.remark = booking.remark || ''
@@ -650,4 +668,46 @@ async function saveRemark() {
     savingRemark.value = false
   }
 }
+
+async function cancelBookingConfirmation(booking: PublicBooking) {
+  if (booking.status !== 'confirmed' || cancellingBookingId.value) {
+    return
+  }
+
+  if (import.meta.client && !window.confirm(`Cancel confirmation for ${booking.customerName}? The booking will return to pending and the seats will be released.`)) {
+    return
+  }
+
+  cancellingBookingId.value = booking.id
+
+  try {
+    const response = await apiClient<CancelBookingConfirmationResponse>(`/api/public/bookings/${booking.confirmationToken}/cancel`, {
+      method: 'POST'
+    })
+
+    replaceBooking(response.booking)
+
+    if (!response.alreadyPending) {
+      applyCancelledConfirmationToSummary(booking)
+    }
+
+    toast.add({
+      title: response.alreadyPending ? 'Booking already pending' : 'Confirmation cancelled',
+      description: response.alreadyPending
+        ? `${booking.customerName} was already pending confirmation.`
+        : `${booking.customerName} has been returned to pending status.`,
+      color: response.alreadyPending ? 'warning' : 'success',
+      icon: 'i-lucide-x-circle'
+    })
+  } catch (error: any) {
+    toast.add({
+      title: 'Cancellation failed',
+      description: getErrorMessage(error, 'Unable to cancel the booking confirmation.'),
+      color: 'error',
+      icon: 'i-lucide-circle-alert'
+    })
+  } finally {
+    cancellingBookingId.value = null
+  }
+}
 </script>
diff --git a/app/pages/confirmation/[token].vue b/app/pages/confirmation/[token].vue
index 46aa4a6..e326dd0 100644
--- a/app/pages/confirmation/[token].vue
+++ b/app/pages/confirmation/[token].vue
@@ -1,5 +1,5 @@
 <script lang="ts" setup>
-import type { ConfirmBookingResponse, PublicBooking } from '~~/shared/booking'
+import type { CancelBookingConfirmationResponse, ConfirmBookingResponse, PublicBooking } from '~~/shared/booking'
 
 import {
   formatBookingCurrency,
@@ -15,6 +15,7 @@ const apiClient = useApiClient()
 
 const token = String(route.params.token || '')
 const confirming = ref(false)
+const cancelling = ref(false)
 
 let initialBooking: PublicBooking
 
@@ -114,6 +115,47 @@ async function confirmBooking() {
     confirming.value = false
   }
 }
+
+async function cancelBookingConfirmation() {
+  if (booking.value.status !== 'confirmed') {
+    return
+  }
+
+  if (import.meta.client && !window.confirm('Cancel this confirmation? The booking will return to pending and the seats will be released.')) {
+    return
+  }
+
+  cancelling.value = true
+
+  try {
+    const response = await apiClient<CancelBookingConfirmationResponse>(
+      `/api/public/bookings/${token}/cancel`,
+      {
+        method: 'POST'
+      }
+    )
+
+    booking.value = response.booking
+
+    toast.add({
+      title: response.alreadyPending ? 'Booking already pending' : 'Confirmation cancelled',
+      description: response.alreadyPending
+        ? 'This booking was already pending confirmation.'
+        : 'The booking has been returned to pending status.',
+      color: response.alreadyPending ? 'warning' : 'success',
+      icon: 'i-lucide-x-circle'
+    })
+  } catch (error) {
+    toast.add({
+      title: 'Cancellation failed',
+      description: getErrorMessage(error, 'Please try again in a moment.'),
+      color: 'error',
+      icon: 'i-lucide-circle-alert'
+    })
+  } finally {
+    cancelling.value = false
+  }
+}
 </script>
 
 <template>
@@ -198,13 +240,24 @@ async function confirmBooking() {
           />
 
           <UButton
+            v-if="booking.status === 'pending'"
             label="Confirm This Booking"
             icon="i-lucide-check-check"
             class="justify-center"
-            :disabled="booking.status === 'confirmed'"
             :loading="confirming"
             @click="confirmBooking"
           />
+
+          <UButton
+            v-else
+            label="Cancel Confirmation"
+            color="error"
+            variant="outline"
+            icon="i-lucide-x-circle"
+            class="justify-center"
+            :loading="cancelling"
+            @click="cancelBookingConfirmation"
+          />
         </div>
       </UCard>
     </div>
diff --git a/server/api/public/bookings/[token]/cancel.post.ts b/server/api/public/bookings/[token]/cancel.post.ts
new file mode 100644
index 0000000..e6e5117
--- /dev/null
+++ b/server/api/public/bookings/[token]/cancel.post.ts
@@ -0,0 +1,31 @@
+import type { CancelBookingConfirmationResponse } from '~~/shared/booking'
+
+import { cancelBookingConfirmationByConfirmationToken, getBookingByConfirmationToken } from '../../../../utils/booking-repository'
+import { getRequiredRouteParam, httpError } from '../../../../utils/http'
+
+export default defineEventHandler(async (event): Promise<CancelBookingConfirmationResponse> => {
+  const token = getRequiredRouteParam(event, 'token', 'Confirmation token')
+  const existingBooking = await getBookingByConfirmationToken(token)
+
+  if (!existingBooking) {
+    httpError(404, 'Booking not found')
+  }
+
+  if (existingBooking.status === 'pending') {
+    return {
+      booking: existingBooking,
+      alreadyPending: true
+    }
+  }
+
+  const booking = await cancelBookingConfirmationByConfirmationToken(token)
+
+  if (!booking) {
+    httpError(404, 'Booking not found')
+  }
+
+  return {
+    booking,
+    alreadyPending: false
+  }
+})
diff --git a/server/utils/booking-repository.ts b/server/utils/booking-repository.ts
index 099f5e2..3b10b15 100644
--- a/server/utils/booking-repository.ts
+++ b/server/utils/booking-repository.ts
@@ -859,3 +859,30 @@ export async function confirmBookingByConfirmationToken(confirmationToken: strin
 
   return await getBookingByConfirmationToken(confirmationToken)
 }
+
+export async function cancelBookingConfirmationByConfirmationToken(confirmationToken: string): Promise<PublicBooking | null> {
+  await ensureDatabaseReady()
+  const sql = getSqlClient()
+
+  const [row] = await sql<DbBookingRow[]>`
+    with updated_booking as (
+      update bookings
+      set
+        status = 'pending',
+        confirmed_at = null,
+        updated_at = now()
+      where confirmation_token = ${confirmationToken}
+        and status = 'confirmed'
+      returning *
+    )
+    select ${bookingSelectColumns(sql)}
+    from updated_booking as bookings
+    ${bookingJoins(sql)}
+  `
+
+  if (row) {
+    return mapBooking(row)
+  }
+
+  return await getBookingByConfirmationToken(confirmationToken)
+}
diff --git a/shared/booking.ts b/shared/booking.ts
index 3c4e816..44b79a1 100644
--- a/shared/booking.ts
+++ b/shared/booking.ts
@@ -145,6 +145,11 @@ export interface ConfirmBookingResponse {
   ticketReceiptWhatsApp: WhatsAppDeliveryResult
 }
 
+export interface CancelBookingConfirmationResponse {
+  booking: PublicBooking
+  alreadyPending: boolean
+}
+
 export function isBookingStatus(value: string | null | undefined): value is BookingStatus {
   return value === 'pending' || value === 'confirmed'
 }