diff --git a/backend/apps/pisadmin/dashboard/serializers.py b/backend/apps/pisadmin/dashboard/serializers.py
new file mode 100644
index 0000000..4691603
--- /dev/null
+++ b/backend/apps/pisadmin/dashboard/serializers.py
@@ -0,0 +1,66 @@
+from rest_framework import serializers
+
+
+class BuyerKPISerializer(serializers.Serializer):
+    total_inquiries = serializers.IntegerField()
+    pending_inquiries = serializers.IntegerField()
+    completed_quotes = serializers.IntegerField()
+    total_suppliers = serializers.IntegerField()
+
+
+class BuyerTaskSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    title = serializers.CharField()
+    inquiry_no = serializers.CharField()
+    status = serializers.CharField()
+    created_at = serializers.DateTimeField()
+
+
+class SupplierKPISerializer(serializers.Serializer):
+    total_quotes = serializers.IntegerField()
+    pending_quotes = serializers.IntegerField()
+    won_quotes = serializers.IntegerField()
+    conversion_rate = serializers.FloatField()
+
+
+class SupplierQuoteSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    inquiry_no = serializers.CharField()
+    item_name = serializers.CharField()
+    quantity = serializers.IntegerField()
+    unit = serializers.CharField()
+    deadline = serializers.DateTimeField()
+
+
+class MessageSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    title = serializers.CharField()
+    content = serializers.CharField()
+    is_read = serializers.BooleanField()
+    created_at = serializers.DateTimeField()
+
+
+class TrendSerializer(serializers.Serializer):
+    month = serializers.CharField()
+    count = serializers.IntegerField(required=False)
+    quotes = serializers.IntegerField(required=False)
+    won = serializers.IntegerField(required=False)
+
+
+class BuyerDashboardSerializer(serializers.Serializer):
+    kpi = BuyerKPISerializer()
+    tasks = BuyerTaskSerializer(many=True)
+    messages = MessageSerializer(many=True)
+    trend = TrendSerializer(many=True)
+
+
+class SupplierDashboardSerializer(serializers.Serializer):
+    kpi = SupplierKPISerializer()
+    pending_quotes = SupplierQuoteSerializer(many=True)
+    messages = MessageSerializer(many=True)
+    trend = TrendSerializer(many=True)
+
+
+class DashboardResponseSerializer(serializers.Serializer):
+    buyer = BuyerDashboardSerializer(allow_null=True)
+    supplier = SupplierDashboardSerializer(allow_null=True)