diff --git a/plugin-server/src/types.ts b/plugin-server/src/types.ts
index e8682da3b337be..47ac3764a3528d 100644
--- a/plugin-server/src/types.ts
+++ b/plugin-server/src/types.ts
@@ -1103,6 +1103,7 @@ export interface EventDefinitionType {
     volume_30_day: number | null
     query_usage_30_day: number | null
     team_id: number
+    project_id: number | null
     last_seen_at: string // DateTime
     created_at: string // DateTime
 }
@@ -1142,6 +1143,7 @@ export interface PropertyDefinitionType {
     volume_30_day: number | null
     query_usage_30_day: number | null
     team_id: number
+    project_id: number | null
     property_type?: PropertyType
     type: PropertyDefinitionTypeEnum
     group_type_index: number | null
@@ -1152,6 +1154,7 @@ export interface EventPropertyType {
     event: string
     property: string
     team_id: number
+    project_id: number | null
 }
 
 export type PluginFunction = 'onEvent' | 'processEvent' | 'pluginTask'
diff --git a/posthog/migrations/0523_project_field_in_taxonomy.py b/posthog/migrations/0523_project_field_in_taxonomy.py
new file mode 100644
index 00000000000000..9559cc011bc857
--- /dev/null
+++ b/posthog/migrations/0523_project_field_in_taxonomy.py
@@ -0,0 +1,66 @@
+# Generated by Django 4.2.15 on 2024-10-29 12:15
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+    atomic = False  # Added to support concurrent index creation
+    dependencies = [("posthog", "0522_datawarehouse_salesforce_opportunity")]
+
+    operations = [
+        migrations.SeparateDatabaseAndState(
+            state_operations=[
+                migrations.AddField(
+                    model_name="eventdefinition",
+                    name="project",
+                    field=models.ForeignKey(
+                        null=True, on_delete=django.db.models.deletion.CASCADE, to="posthog.project"
+                    ),
+                ),
+                migrations.AddField(
+                    model_name="eventproperty",
+                    name="project",
+                    field=models.ForeignKey(
+                        null=True, on_delete=django.db.models.deletion.CASCADE, to="posthog.project"
+                    ),
+                ),
+                migrations.AddField(
+                    model_name="propertydefinition",
+                    name="project",
+                    field=models.ForeignKey(
+                        null=True, on_delete=django.db.models.deletion.CASCADE, to="posthog.project"
+                    ),
+                ),
+            ],
+            database_operations=[
+                migrations.RunSQL(
+                    """
+                    -- Add field project to eventdefinition
+                    ALTER TABLE "posthog_eventdefinition" ADD COLUMN "project_id" bigint NULL CONSTRAINT "posthog_eventdefinit_project_id_f93fcbb0_fk_posthog_p" REFERENCES "posthog_project"("id") DEFERRABLE INITIALLY DEFERRED;
+                    SET CONSTRAINTS "posthog_eventdefinit_project_id_f93fcbb0_fk_posthog_p" IMMEDIATE;
+                    -- Add field project to eventproperty
+                    ALTER TABLE "posthog_eventproperty" ADD COLUMN "project_id" bigint NULL CONSTRAINT "posthog_eventproperty_project_id_dd2337d2_fk_posthog_project_id" REFERENCES "posthog_project"("id") DEFERRABLE INITIALLY DEFERRED;
+                    SET CONSTRAINTS "posthog_eventproperty_project_id_dd2337d2_fk_posthog_project_id" IMMEDIATE;
+                    -- Add field project to propertydefinition
+                    ALTER TABLE "posthog_propertydefinition" ADD COLUMN "project_id" bigint NULL CONSTRAINT "posthog_propertydefi_project_id_d3eb982d_fk_posthog_p" REFERENCES "posthog_project"("id") DEFERRABLE INITIALLY DEFERRED;
+                    SET CONSTRAINTS "posthog_propertydefi_project_id_d3eb982d_fk_posthog_p" IMMEDIATE;""",
+                    reverse_sql="""
+                    ALTER TABLE "posthog_eventdefinition" DROP COLUMN IF EXISTS "project_id";
+                    ALTER TABLE "posthog_eventproperty" DROP COLUMN IF EXISTS "project_id";
+                    ALTER TABLE "posthog_propertydefinition" DROP COLUMN IF EXISTS "project_id";""",
+                ),
+                # We add CONCURRENTLY to the CREATE INDEX commands
+                migrations.RunSQL(
+                    """
+                    CREATE INDEX CONCURRENTLY "posthog_eventdefinition_project_id_f93fcbb0" ON "posthog_eventdefinition" ("project_id");
+                    CREATE INDEX CONCURRENTLY "posthog_eventproperty_project_id_dd2337d2" ON "posthog_eventproperty" ("project_id");
+                    CREATE INDEX CONCURRENTLY "posthog_propertydefinition_project_id_d3eb982d" ON "posthog_propertydefinition" ("project_id");""",
+                    reverse_sql="""
+                    DROP INDEX IF EXISTS "posthog_eventdefinition_project_id_f93fcbb0";
+                    DROP INDEX IF EXISTS "posthog_eventproperty_project_id_dd2337d2";
+                    DROP INDEX IF EXISTS "posthog_propertydefinition_project_id_d3eb982d";""",
+                ),
+            ],
+        )
+    ]
diff --git a/posthog/migrations/max_migration.txt b/posthog/migrations/max_migration.txt
index 334dacbdf2b211..6a909226c99e4f 100644
--- a/posthog/migrations/max_migration.txt
+++ b/posthog/migrations/max_migration.txt
@@ -1 +1 @@
-0522_datawarehouse_salesforce_opportunity
+0523_project_field_in_taxonomy
diff --git a/posthog/models/event_definition.py b/posthog/models/event_definition.py
index 3f5c8d8a6f45b9..bf24bd2f45b905 100644
--- a/posthog/models/event_definition.py
+++ b/posthog/models/event_definition.py
@@ -13,6 +13,7 @@ class EventDefinition(UUIDModel):
         related_name="event_definitions",
         related_query_name="team",
     )
+    project = models.ForeignKey("Project", on_delete=models.CASCADE, null=True)
     name = models.CharField(max_length=400)
     created_at = models.DateTimeField(default=timezone.now, null=True)
     last_seen_at = models.DateTimeField(default=None, null=True)
diff --git a/posthog/models/event_property.py b/posthog/models/event_property.py
index a5087c5b3f6677..f9a54827cddf41 100644
--- a/posthog/models/event_property.py
+++ b/posthog/models/event_property.py
@@ -6,6 +6,7 @@
 
 class EventProperty(models.Model):
     team = models.ForeignKey(Team, on_delete=models.CASCADE)
+    project = models.ForeignKey("Project", on_delete=models.CASCADE, null=True)
     event = models.CharField(max_length=400, null=False)
     property = models.CharField(max_length=400, null=False)
 
diff --git a/posthog/models/property_definition.py b/posthog/models/property_definition.py
index e2e77eba2148c8..1719c4007e97e8 100644
--- a/posthog/models/property_definition.py
+++ b/posthog/models/property_definition.py
@@ -43,6 +43,7 @@ class Type(models.IntegerChoices):
         related_name="property_definitions",
         related_query_name="team",
     )
+    project = models.ForeignKey("Project", on_delete=models.CASCADE, null=True)
     name = models.CharField(max_length=400)
     is_numerical = models.BooleanField(
         default=False
diff --git a/rust/property-defs-rs/src/types.rs b/rust/property-defs-rs/src/types.rs
index 892ddcc4b55345..e2c09c129934c9 100644
--- a/rust/property-defs-rs/src/types.rs
+++ b/rust/property-defs-rs/src/types.rs
@@ -133,6 +133,7 @@ impl Update {
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Event {
     pub team_id: i32,
+    pub project_id: i32,
     pub event: String,
     pub properties: Option<String>,
 }
@@ -419,14 +420,15 @@ impl EventDefinition {
     {
         sqlx::query!(
             r#"
-            INSERT INTO posthog_eventdefinition (id, name, volume_30_day, query_usage_30_day, team_id, last_seen_at, created_at)
-            VALUES ($1, $2, NULL, NULL, $3, $4, NOW()) ON CONFLICT
+            INSERT INTO posthog_eventdefinition (id, name, volume_30_day, query_usage_30_day, team_id, project_id, last_seen_at, created_at)
+            VALUES ($1, $2, NULL, NULL, $3, $4, $5, NOW()) ON CONFLICT
             ON CONSTRAINT posthog_eventdefinition_team_id_name_80fa0b87_uniq
             DO UPDATE SET last_seen_at = $4
         "#,
             Uuid::now_v7(),
             self.name,
             self.team_id,
+            self.project_id,
             Utc::now() // We floor the update datetime to the nearest day for cache purposes, but can insert the exact time we see the event
         ).execute(executor).await.map(|_| ())
     }
@@ -462,8 +464,8 @@ impl PropertyDefinition {
 
         sqlx::query!(
             r#"
-            INSERT INTO posthog_propertydefinition (id, name, type, group_type_index, is_numerical, volume_30_day, query_usage_30_day, team_id, property_type)
-            VALUES ($1, $2, $3, $4, $5, NULL, NULL, $6, $7)
+            INSERT INTO posthog_propertydefinition (id, name, type, group_type_index, is_numerical, volume_30_day, query_usage_30_day, team_id, project_id, property_type)
+            VALUES ($1, $2, $3, $4, $5, NULL, NULL, $6, $7, $8)
             ON CONFLICT (team_id, name, type, coalesce(group_type_index, -1))
             DO UPDATE SET property_type=EXCLUDED.property_type WHERE posthog_propertydefinition.property_type IS NULL
         "#,
@@ -473,6 +475,7 @@ impl PropertyDefinition {
             group_type_index,
             self.is_numerical,
             self.team_id,
+            self.project_id,
             self.property_type.as_ref().map(|t| t.to_string())
         ).execute(executor).await.map(|_| ())
     }
@@ -484,10 +487,11 @@ impl EventProperty {
         E: Executor<'c, Database = Postgres>,
     {
         sqlx::query!(
-            r#"INSERT INTO posthog_eventproperty (event, property, team_id) VALUES ($1, $2, $3) ON CONFLICT DO NOTHING"#,
+            r#"INSERT INTO posthog_eventproperty (event, property, team_id, project_id) VALUES ($1, $2, $3, $4) ON CONFLICT DO NOTHING"#,
             self.event,
             self.property,
             self.team_id
+            self.project_id
         )
         .execute(executor)
         .await