diff --git a/packages/features/bookings/lib/handleSeats/handleSeats.ts b/packages/features/bookings/lib/handleSeats/handleSeats.ts
index ac64a72330..9473bf93fe 100644
--- a/packages/features/bookings/lib/handleSeats/handleSeats.ts
+++ b/packages/features/bookings/lib/handleSeats/handleSeats.ts
@@ -107,12 +107,14 @@ const handleSeats = async (newSeatedBookingObject: NewSeatedBookingObject) => {
       ...(typeof resultBooking.metadata === "object" && resultBooking.metadata),
       ...reqBodyMetadata,
     };
+    // For seated events, use the phone number from the specific attendee being added
+    const attendeePhoneNumber = invitee[0]?.phoneNumber || smsReminderNumber || null;
     try {
       const creditService = new CreditService();
 
       await WorkflowService.scheduleWorkflowsForNewBooking({
         workflows: workflows,
-        smsReminderNumber: smsReminderNumber || null,
+        smsReminderNumber: attendeePhoneNumber,
         calendarEvent: {
           ...evt,
           uid: seatedBooking.uid,
@@ -154,7 +156,7 @@ const handleSeats = async (newSeatedBookingObject: NewSeatedBookingObject) => {
       metadata,
       eventTypeId,
       status: "ACCEPTED",
-      smsReminderNumber: seatedBooking?.smsReminderNumber || undefined,
+      smsReminderNumber: attendeePhoneNumber || undefined,
       rescheduledBy,
     };
 
diff --git a/packages/features/bookings/repositories/BookingSeatRepository.ts b/packages/features/bookings/repositories/BookingSeatRepository.ts
index ace67b38d8..479810e1ba 100644
--- a/packages/features/bookings/repositories/BookingSeatRepository.ts
+++ b/packages/features/bookings/repositories/BookingSeatRepository.ts
@@ -17,4 +17,26 @@ export class BookingSeatRepository {
       },
     });
   }
+
+  getByReferenceUidWithAttendeeDetails(referenceUid: string) {
+    return this.prismaClient.bookingSeat.findUnique({
+      where: {
+        referenceUid,
+      },
+      select: {
+        attendee: {
+          select: {
+            name: true,
+            id: true,
+            bookingId: true,
+            noShow: true,
+            phoneNumber: true,
+            email: true,
+            locale: true,
+            timeZone: true,
+          },
+        },
+      },
+    });
+  }
 }
diff --git a/packages/features/ee/workflows/api/scheduleSMSReminders.ts b/packages/features/ee/workflows/api/scheduleSMSReminders.ts
index 6958a9c17a..f8ddb99c08 100644
--- a/packages/features/ee/workflows/api/scheduleSMSReminders.ts
+++ b/packages/features/ee/workflows/api/scheduleSMSReminders.ts
@@ -5,6 +5,7 @@ import { NextResponse } from "next/server";
 import dayjs from "@calcom/dayjs";
 import { bulkShortenLinks } from "@calcom/ee/workflows/lib/reminders/utils";
 import { getCalEventResponses } from "@calcom/features/bookings/lib/getCalEventResponses";
+import { BookingSeatRepository } from "@calcom/features/bookings/repositories/BookingSeatRepository";
 import { CreditService } from "@calcom/features/ee/billing/credit-service";
 import { getBookerBaseUrl } from "@calcom/features/ee/organizations/lib/getBookerUrlServer";
 import { isAttendeeAction } from "@calcom/features/ee/workflows/lib/actionHelperFunctions";
@@ -61,24 +62,34 @@ export async function handler(req: NextRequest) {
     const teamId = reminder.workflowStep.workflow.teamId;
 
     try {
+      // For seated events, get the correct attendee based on seatReferenceId
+      let targetAttendee = reminder.booking?.attendees[0];
+      if (reminder.seatReferenceId) {
+        const bookingSeatRepository = new BookingSeatRepository(prisma);
+        const seatAttendeeData = await bookingSeatRepository.getByReferenceUidWithAttendeeDetails(
+          reminder.seatReferenceId
+        );
+        if (seatAttendeeData?.attendee) {
+          targetAttendee = seatAttendeeData.attendee;
+        }
+      }
+
       const sendTo =
         reminder.workflowStep.action === WorkflowActions.SMS_NUMBER
           ? reminder.workflowStep.sendTo
-          : reminder.booking?.smsReminderNumber;
+          : targetAttendee?.phoneNumber;
 
       const userName =
-        reminder.workflowStep.action === WorkflowActions.SMS_ATTENDEE
-          ? reminder.booking?.attendees[0].name
-          : "";
+        reminder.workflowStep.action === WorkflowActions.SMS_ATTENDEE ? targetAttendee?.name || "" : "";
 
       const attendeeName =
         reminder.workflowStep.action === WorkflowActions.SMS_ATTENDEE
           ? reminder.booking?.user?.name
-          : reminder.booking?.attendees[0].name;
+          : targetAttendee?.name;
 
       const timeZone =
         reminder.workflowStep.action === WorkflowActions.SMS_ATTENDEE
-          ? reminder.booking?.attendees[0].timeZone
+          ? targetAttendee?.timeZone
           : reminder.booking?.user?.timeZone;
 
       const senderID = getSenderId(sendTo, reminder.workflowStep.sender);
@@ -86,7 +97,7 @@ export async function handler(req: NextRequest) {
       const locale =
         reminder.workflowStep.action === WorkflowActions.EMAIL_ATTENDEE ||
         reminder.workflowStep.action === WorkflowActions.SMS_ATTENDEE
-          ? reminder.booking?.attendees[0].locale
+          ? targetAttendee?.locale
           : reminder.booking?.user?.locale;
 
       let message: string | null = reminder.workflowStep.reminderBody || null;
@@ -111,7 +122,7 @@ export async function handler(req: NextRequest) {
 
         const recipientEmail = getWorkflowRecipientEmail({
           action: reminder.workflowStep.action || WorkflowActions.SMS_NUMBER,
-          attendeeEmail: reminder.booking.attendees[0].email,
+          attendeeEmail: targetAttendee?.email,
           organizerEmail: reminder.booking.user?.email,
         });
 
@@ -131,8 +142,8 @@ export async function handler(req: NextRequest) {
         const variables: VariablesType = {
           eventName: reminder.booking?.eventType?.title,
           organizerName: reminder.booking?.user?.name || "",
-          attendeeName: reminder.booking?.attendees[0].name,
-          attendeeEmail: reminder.booking?.attendees[0].email,
+          attendeeName: targetAttendee?.name,
+          attendeeEmail: targetAttendee?.email,
           eventDate: dayjs(reminder.booking?.startTime).tz(timeZone),
           eventEndTime: dayjs(reminder.booking?.endTime).tz(timeZone),
           timeZone: timeZone,
@@ -142,13 +153,9 @@ export async function handler(req: NextRequest) {
           meetingUrl,
           cancelLink,
           rescheduleLink,
-          attendeeTimezone: reminder.booking.attendees[0].timeZone,
-          eventTimeInAttendeeTimezone: dayjs(reminder.booking.startTime).tz(
-            reminder.booking.attendees[0].timeZone
-          ),
-          eventEndTimeInAttendeeTimezone: dayjs(reminder.booking?.endTime).tz(
-            reminder.booking.attendees[0].timeZone
-          ),
+          attendeeTimezone: targetAttendee?.timeZone,
+          eventTimeInAttendeeTimezone: dayjs(reminder.booking.startTime).tz(targetAttendee?.timeZone),
+          eventEndTimeInAttendeeTimezone: dayjs(reminder.booking?.endTime).tz(targetAttendee?.timeZone),
         };
         const customMessage = customTemplate(
           reminder.workflowStep.reminderBody || "",
@@ -190,7 +197,7 @@ export async function handler(req: NextRequest) {
           fallbackData:
             reminder.workflowStep.action && isAttendeeAction(reminder.workflowStep.action)
               ? {
-                  email: reminder.booking.attendees[0].email,
+                  email: targetAttendee?.email,
                   t: await getTranslation(locale || "en", "common"),
                   replyTo: reminder.booking?.user?.email ?? "",
                   workflowStepId: reminder.workflowStep.id,
diff --git a/packages/features/ee/workflows/api/scheduleWhatsappReminders.ts b/packages/features/ee/workflows/api/scheduleWhatsappReminders.ts
index 6570a51811..25b59d3d83 100644
--- a/packages/features/ee/workflows/api/scheduleWhatsappReminders.ts
+++ b/packages/features/ee/workflows/api/scheduleWhatsappReminders.ts
@@ -3,6 +3,7 @@ import type { NextRequest } from "next/server";
 import { NextResponse } from "next/server";
 
 import dayjs from "@calcom/dayjs";
+import { BookingSeatRepository } from "@calcom/features/bookings/repositories/BookingSeatRepository";
 import { CreditService } from "@calcom/features/ee/billing/credit-service";
 import { getTranslation } from "@calcom/lib/server/i18n";
 import { getTimeFormatStringFromUserTimeFormat } from "@calcom/lib/timeFormat";
@@ -53,24 +54,34 @@ export async function handler(req: NextRequest) {
     const teamId = reminder.workflowStep.workflow.teamId;
 
     try {
+      // For seated events, get the correct attendee based on seatReferenceId
+      let targetAttendee = reminder.booking?.attendees[0];
+      if (reminder.seatReferenceId) {
+        const bookingSeatRepository = new BookingSeatRepository(prisma);
+        const seatAttendeeData = await bookingSeatRepository.getByReferenceUidWithAttendeeDetails(
+          reminder.seatReferenceId
+        );
+        if (seatAttendeeData?.attendee) {
+          targetAttendee = seatAttendeeData.attendee;
+        }
+      }
+
       const sendTo =
         reminder.workflowStep.action === WorkflowActions.WHATSAPP_NUMBER
           ? reminder.workflowStep.sendTo
-          : reminder.booking?.smsReminderNumber;
+          : targetAttendee?.phoneNumber;
 
       const userName =
-        reminder.workflowStep.action === WorkflowActions.WHATSAPP_ATTENDEE
-          ? reminder.booking?.attendees[0].name
-          : "";
+        reminder.workflowStep.action === WorkflowActions.WHATSAPP_ATTENDEE ? targetAttendee?.name || "" : "";
 
       const attendeeName =
         reminder.workflowStep.action === WorkflowActions.WHATSAPP_ATTENDEE
           ? reminder.booking?.user?.name
-          : reminder.booking?.attendees[0].name;
+          : targetAttendee?.name;
 
       const timeZone =
         reminder.workflowStep.action === WorkflowActions.WHATSAPP_ATTENDEE
-          ? reminder.booking?.attendees[0].timeZone
+          ? targetAttendee?.timeZone
           : reminder.booking?.user?.timeZone;
 
       const startTime = reminder.booking?.startTime.toISOString();
@@ -121,8 +132,8 @@ export async function handler(req: NextRequest) {
           fallbackData:
             reminder.workflowStep.action && isAttendeeAction(reminder.workflowStep.action)
               ? {
-                  email: reminder.booking.attendees[0].email,
-                  t: await getTranslation(reminder.booking.attendees[0].locale || "en", "common"),
+                  email: targetAttendee?.email,
+                  t: await getTranslation(targetAttendee?.locale || "en", "common"),
                   replyTo: reminder.booking?.user?.email ?? "",
                   workflowStepId: reminder.workflowStep.id,
                 }
diff --git a/packages/features/ee/workflows/lib/getWorkflowReminders.ts b/packages/features/ee/workflows/lib/getWorkflowReminders.ts
index f72d24ae2b..99ca56db09 100644
--- a/packages/features/ee/workflows/lib/getWorkflowReminders.ts
+++ b/packages/features/ee/workflows/lib/getWorkflowReminders.ts
@@ -49,7 +49,7 @@ type PartialBooking =
 
 export type PartialWorkflowReminder = Pick<
   WorkflowReminder,
-  "id" | "isMandatoryReminder" | "scheduledDate" | "uuid"
+  "id" | "isMandatoryReminder" | "scheduledDate" | "uuid" | "seatReferenceId"
 > & {
   booking: PartialBooking | null;
 } & { workflowStep: PartialWorkflowStep };
@@ -134,6 +134,7 @@ export const select = {
   scheduledDate: true,
   isMandatoryReminder: true,
   uuid: true,
+  seatReferenceId: true,
   workflowStep: {
     select: {
       action: true,
diff --git a/packages/features/ee/workflows/lib/reminders/reminderScheduler.ts b/packages/features/ee/workflows/lib/reminders/reminderScheduler.ts
index e38c8624ce..eb6ed7c93e 100644
--- a/packages/features/ee/workflows/lib/reminders/reminderScheduler.ts
+++ b/packages/features/ee/workflows/lib/reminders/reminderScheduler.ts
@@ -63,6 +63,30 @@ export type ScheduleWorkflowRemindersArgs = ProcessWorkflowStepParams & {
   creditCheckFn: CreditCheckFn;
 };
 
+const getReminderPhoneNumber = async (
+  action: WorkflowActions,
+  seatReferenceUid: string | undefined,
+  smsReminderNumber: string | null,
+  stepSendTo: string | null
+) => {
+  const isAttendeeAction =
+    action === WorkflowActions.SMS_ATTENDEE || action === WorkflowActions.WHATSAPP_ATTENDEE;
+
+  if (!isAttendeeAction) {
+    return stepSendTo;
+  }
+
+  if (seatReferenceUid) {
+    const bookingSeatRepository = new BookingSeatRepository(prisma);
+    const seatAttendeeData = await bookingSeatRepository.getByReferenceUidWithAttendeeDetails(
+      seatReferenceUid
+    );
+    return seatAttendeeData?.attendee?.phoneNumber || smsReminderNumber;
+  }
+
+  return smsReminderNumber;
+};
+
 const processWorkflowStep = async (
   workflow: Workflow,
   step: WorkflowStep,
@@ -101,7 +125,12 @@ const processWorkflowStep = async (
 
   if (isSMSAction(step.action)) {
     const { scheduleSMSReminder } = await import("./smsReminderManager");
-    const sendTo = step.action === WorkflowActions.SMS_ATTENDEE ? smsReminderNumber : step.sendTo;
+    const sendTo = await getReminderPhoneNumber(
+      step.action,
+      seatReferenceUid,
+      smsReminderNumber,
+      step.sendTo
+    );
 
     await scheduleSMSReminder({
       ...scheduleFunctionParams,
@@ -139,7 +168,12 @@ const processWorkflowStep = async (
     }
 
     const { scheduleWhatsappReminder } = await import("./whatsappReminderManager");
-    const sendTo = step.action === WorkflowActions.WHATSAPP_ATTENDEE ? smsReminderNumber : step.sendTo;
+    const sendTo = await getReminderPhoneNumber(
+      step.action,
+      seatReferenceUid,
+      smsReminderNumber,
+      step.sendTo
+    );
 
     await scheduleWhatsappReminder({
       ...scheduleFunctionParams,