diff --git a/internal/services/cosmos/cosmosdb_account_resource.go b/internal/services/cosmos/cosmosdb_account_resource.go
index 7740e3d1e5a1..124fe48ee2d9 100644
--- a/internal/services/cosmos/cosmosdb_account_resource.go
+++ b/internal/services/cosmos/cosmosdb_account_resource.go
@@ -505,6 +505,12 @@ func resourceCosmosDbAccount() *pluginsdk.Resource {
 				},
 			},
 
+			"partition_merge_enabled": {
+				Type:     pluginsdk.TypeBool,
+				Optional: true,
+				Default:  false,
+			},
+
 			"backup": {
 				Type:     pluginsdk.TypeList,
 				Optional: true,
@@ -750,6 +756,7 @@ func resourceCosmosDbAccountCreate(d *pluginsdk.ResourceData, meta interface{})
 	enableFreeTier := d.Get("enable_free_tier").(bool)
 	enableAutomaticFailover := d.Get("enable_automatic_failover").(bool)
 	enableMultipleWriteLocations := d.Get("enable_multiple_write_locations").(bool)
+	partitionMergeEnabled := d.Get("partition_merge_enabled").(bool)
 	enableAnalyticalStorage := d.Get("analytical_storage_enabled").(bool)
 	disableLocalAuthentication := d.Get("local_authentication_disabled").(bool)
 
@@ -801,6 +808,7 @@ func resourceCosmosDbAccountCreate(d *pluginsdk.ResourceData, meta interface{})
 			Capabilities:                       capabilities,
 			VirtualNetworkRules:                expandAzureRmCosmosDBAccountVirtualNetworkRules(d),
 			EnableMultipleWriteLocations:       utils.Bool(enableMultipleWriteLocations),
+			EnablePartitionMerge:               pointer.To(partitionMergeEnabled),
 			PublicNetworkAccess:                pointer.To(publicNetworkAccess),
 			EnableAnalyticalStorage:            utils.Bool(enableAnalyticalStorage),
 			Cors:                               common.ExpandCosmosCorsRule(d.Get("cors_rule").([]interface{})),
@@ -997,7 +1005,7 @@ func resourceCosmosDbAccountUpdate(d *pluginsdk.ResourceData, meta interface{})
 			"capacity", "create_mode", "restore", "key_vault_key_id", "mongo_server_version",
 			"public_network_access_enabled", "ip_range_filter", "offer_type", "is_virtual_network_filter_enabled",
 			"kind", "tags", "enable_free_tier", "enable_automatic_failover", "analytical_storage_enabled",
-			"local_authentication_disabled") {
+			"local_authentication_disabled", "partition_merge_enabled") {
 			updateRequired = true
 		}
 
@@ -1044,6 +1052,7 @@ func resourceCosmosDbAccountUpdate(d *pluginsdk.ResourceData, meta interface{})
 				NetworkAclBypassResourceIds:        utils.ExpandStringSlice(d.Get("network_acl_bypass_ids").([]interface{})),
 				DisableLocalAuth:                   disableLocalAuthentication,
 				BackupPolicy:                       backup,
+				EnablePartitionMerge:               pointer.To(d.Get("partition_merge_enabled").(bool)),
 			},
 			Tags: t,
 		}
@@ -1327,6 +1336,7 @@ func resourceCosmosDbAccountRead(d *pluginsdk.ResourceData, meta interface{}) er
 		d.Set("public_network_access_enabled", pointer.From(props.PublicNetworkAccess) == cosmosdb.PublicNetworkAccessEnabled)
 		d.Set("default_identity_type", props.DefaultIdentity)
 		d.Set("create_mode", pointer.From(props.CreateMode))
+		d.Set("partition_merge_enabled", pointer.From(props.EnablePartitionMerge))
 
 		if v := existing.Model.Properties.IsVirtualNetworkFilterEnabled; v != nil {
 			d.Set("is_virtual_network_filter_enabled", props.IsVirtualNetworkFilterEnabled)
diff --git a/internal/services/cosmos/cosmosdb_account_resource_test.go b/internal/services/cosmos/cosmosdb_account_resource_test.go
index fb4f08e5727f..a7ed7274c03a 100644
--- a/internal/services/cosmos/cosmosdb_account_resource_test.go
+++ b/internal/services/cosmos/cosmosdb_account_resource_test.go
@@ -420,7 +420,7 @@ func testAccCosmosDBAccount_updateConsistency(t *testing.T, kind cosmosdb.Databa
 		},
 		data.ImportStep(),
 		{
-			Config: r.consistency(data, kind, cosmosdb.DefaultConsistencyLevelStrong, 8, 880),
+			Config: r.consistency(data, kind, false, cosmosdb.DefaultConsistencyLevelStrong, 8, 880),
 			Check:  checkAccCosmosDBAccount_basic(data, cosmosdb.DefaultConsistencyLevelStrong, 1),
 		},
 		data.ImportStep(),
@@ -430,12 +430,12 @@ func testAccCosmosDBAccount_updateConsistency(t *testing.T, kind cosmosdb.Databa
 		},
 		data.ImportStep(),
 		{
-			Config: r.consistency(data, kind, cosmosdb.DefaultConsistencyLevelBoundedStaleness, 7, 770),
+			Config: r.consistency(data, kind, true, cosmosdb.DefaultConsistencyLevelBoundedStaleness, 7, 770),
 			Check:  checkAccCosmosDBAccount_basic(data, cosmosdb.DefaultConsistencyLevelBoundedStaleness, 1),
 		},
 		data.ImportStep(),
 		{
-			Config: r.consistency(data, kind, cosmosdb.DefaultConsistencyLevelBoundedStaleness, 77, 700),
+			Config: r.consistency(data, kind, false, cosmosdb.DefaultConsistencyLevelBoundedStaleness, 77, 700),
 			Check:  checkAccCosmosDBAccount_basic(data, cosmosdb.DefaultConsistencyLevelBoundedStaleness, 1),
 		},
 		data.ImportStep(),
@@ -1441,7 +1441,7 @@ resource "azurerm_cosmosdb_account" "import" {
 `, r.basic(data, "GlobalDocumentDB", consistency))
 }
 
-func (CosmosDBAccountResource) consistency(data acceptance.TestData, kind cosmosdb.DatabaseAccountKind, consistency cosmosdb.DefaultConsistencyLevel, interval, staleness int) string {
+func (CosmosDBAccountResource) consistency(data acceptance.TestData, kind cosmosdb.DatabaseAccountKind, partitionMergeEnabled bool, consistency cosmosdb.DefaultConsistencyLevel, interval, staleness int) string {
 	return fmt.Sprintf(`
 provider "azurerm" {
   features {}
@@ -1453,11 +1453,12 @@ resource "azurerm_resource_group" "test" {
 }
 
 resource "azurerm_cosmosdb_account" "test" {
-  name                = "acctest-ca-%d"
-  location            = azurerm_resource_group.test.location
-  resource_group_name = azurerm_resource_group.test.name
-  offer_type          = "Standard"
-  kind                = "%s"
+  name                    = "acctest-ca-%d"
+  location                = azurerm_resource_group.test.location
+  resource_group_name     = azurerm_resource_group.test.name
+  offer_type              = "Standard"
+  kind                    = "%s"
+  partition_merge_enabled = %t
 
   consistency_policy {
     consistency_level       = "%s"
@@ -1470,7 +1471,7 @@ resource "azurerm_cosmosdb_account" "test" {
     failover_priority = 0
   }
 }
-`, data.RandomInteger, data.Locations.Primary, data.RandomInteger, string(kind), string(consistency), interval, staleness)
+`, data.RandomInteger, data.Locations.Primary, data.RandomInteger, string(kind), partitionMergeEnabled, string(consistency), interval, staleness)
 }
 
 func (CosmosDBAccountResource) consistencyMongoDB(data acceptance.TestData, consistency cosmosdb.DefaultConsistencyLevel, interval, staleness int) string {
diff --git a/website/docs/r/cosmosdb_account.html.markdown b/website/docs/r/cosmosdb_account.html.markdown
index 3c30ec3a9563..d14da042af98 100644
--- a/website/docs/r/cosmosdb_account.html.markdown
+++ b/website/docs/r/cosmosdb_account.html.markdown
@@ -146,6 +146,8 @@ The following arguments are supported:
 
 * `enable_automatic_failover` - (Optional) Enable automatic failover for this Cosmos DB account.
 
+* `partition_merge_enabled` - (Optional) Is partition merge on the Cosmos DB account enabled? Defaults to `false`.
+
 * `public_network_access_enabled` - (Optional) Whether or not public network access is allowed for this CosmosDB account. Defaults to `true`.
 
 * `capabilities` - (Optional) The capabilities which should be enabled for this Cosmos DB account. Value is a `capabilities` block as defined below.