diff --git a/README.md b/README.md
index 365227f..95cc8b5 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,12 @@ module "appsync" {
       endpoint = "https://search-my-domain.eu-west-1.es.amazonaws.com"
       region   = "eu-west-1"
     }
+
+    opensearchservice1 = {
+      type     = "AMAZON_OPENSEARCH_SERVICE"
+      endpoint = "https://opensearch-my-domain.eu-west-1.es.amazonaws.com"
+      region   = "eu-west-1"
+    }
   }
 
   resolvers = {
@@ -185,6 +191,7 @@ No modules.
 | <a name="input_logs_role_tags"></a> [logs\_role\_tags](#input\_logs\_role\_tags) | Map of tags to add to Cloudwatch logs IAM role | `map(string)` | `{}` | no |
 | <a name="input_name"></a> [name](#input\_name) | Name of GraphQL API | `string` | `""` | no |
 | <a name="input_openid_connect_config"></a> [openid\_connect\_config](#input\_openid\_connect\_config) | Nested argument containing OpenID Connect configuration. | `map(string)` | `{}` | no |
+| <a name="input_opensearchservice_allowed_actions"></a> [opensearchservice\_allowed\_actions](#input\_opensearchservice\_allowed\_actions) | List of allowed IAM actions for datasources type AMAZON\_OPENSEARCH\_SERVICE | `list(string)` | <pre>[<br>  "es:ESHttpDelete",<br>  "es:ESHttpHead",<br>  "es:ESHttpGet",<br>  "es:ESHttpPost",<br>  "es:ESHttpPut"<br>]</pre> | no |
 | <a name="input_resolver_caching_ttl"></a> [resolver\_caching\_ttl](#input\_resolver\_caching\_ttl) | Default caching TTL for resolvers when caching is enabled | `number` | `60` | no |
 | <a name="input_resolvers"></a> [resolvers](#input\_resolvers) | Map of resolvers to create | `any` | `{}` | no |
 | <a name="input_schema"></a> [schema](#input\_schema) | The schema definition, in GraphQL schema language format. Terraform cannot perform drift detection of this configuration. | `string` | `""` | no |
diff --git a/examples/complete/main.tf b/examples/complete/main.tf
index d921e5a..48c703e 100644
--- a/examples/complete/main.tf
+++ b/examples/complete/main.tf
@@ -213,6 +213,15 @@ module "appsync" {
       endpoint = "https://search-my-domain.eu-west-1.es.amazonaws.com"
       region   = "eu-west-1"
     }
+
+    # Opensearch Service support has not been finished & tested
+    opensearchservice1 = {
+      type = "AMAZON_OPENSEARCH_SERVICE"
+
+      # Note: dynamic references (module.opensearchservice1.id) do not work do not work unless you create this resource in advance
+      endpoint = "https://search-my-domain-2.eu-west-1.es.amazonaws.com"
+      region   = "eu-west-1"
+    }
   }
 
   resolvers = {
diff --git a/iam.tf b/iam.tf
index b878553..4758570 100644
--- a/iam.tf
+++ b/iam.tf
@@ -1,7 +1,7 @@
 data "aws_partition" "this" {}
 
 locals {
-  service_roles_with_policies = var.create_graphql_api ? { for k, v in var.datasources : k => v if contains(["AWS_LAMBDA", "AMAZON_DYNAMODB", "AMAZON_ELASTICSEARCH"], v.type) && tobool(lookup(v, "create_service_role", true)) } : {}
+  service_roles_with_policies = var.create_graphql_api ? { for k, v in var.datasources : k => v if contains(["AWS_LAMBDA", "AMAZON_DYNAMODB", "AMAZON_ELASTICSEARCH", "AMAZON_OPENSEARCH_SERVICE"], v.type) && tobool(lookup(v, "create_service_role", true)) } : {}
 
   service_roles_with_policies_lambda = { for k, v in local.service_roles_with_policies : k => merge(v,
     {
@@ -39,10 +39,23 @@ locals {
     }
   ) if v.type == "AMAZON_ELASTICSEARCH" }
 
+  service_roles_with_policies_opensearchservice = { for k, v in local.service_roles_with_policies : k => merge(v,
+    {
+      policy_statements = {
+        opensearchservice = {
+          effect    = "Allow"
+          actions   = lookup(v, "policy_actions", null) == null ? var.opensearchservice_allowed_actions : v.policy_actions
+          resources = [format("arn:${data.aws_partition.this.partition}:es:%v::domain/%v/*", v.region, v.endpoint)]
+        }
+      }
+    }
+  ) if v.type == "AMAZON_OPENSEARCH_SERVICE" }
+
   service_roles_with_specific_policies = merge(
     local.service_roles_with_policies_lambda,
     local.service_roles_with_policies_dynamodb,
     local.service_roles_with_policies_elasticsearch,
+    local.service_roles_with_policies_opensearchservice,
   )
 }
 
diff --git a/main.tf b/main.tf
index be4398c..9142596 100644
--- a/main.tf
+++ b/main.tf
@@ -144,7 +144,7 @@ resource "aws_appsync_datasource" "this" {
   name             = each.key
   type             = each.value.type
   description      = lookup(each.value, "description", null)
-  service_role_arn = lookup(each.value, "service_role_arn", tobool(lookup(each.value, "create_service_role", contains(["AWS_LAMBDA", "AMAZON_DYNAMODB", "AMAZON_ELASTICSEARCH"], each.value.type))) ? aws_iam_role.service_role[each.key].arn : null)
+  service_role_arn = lookup(each.value, "service_role_arn", tobool(lookup(each.value, "create_service_role", contains(["AWS_LAMBDA", "AMAZON_DYNAMODB", "AMAZON_ELASTICSEARCH", "AMAZON_OPENSEARCH_SERVICE"], each.value.type))) ? aws_iam_role.service_role[each.key].arn : null)
 
   dynamic "http_config" {
     for_each = each.value.type == "HTTP" ? [true] : []
@@ -180,6 +180,15 @@ resource "aws_appsync_datasource" "this" {
       region   = lookup(each.value, "region", null)
     }
   }
+
+  dynamic "opensearchservice_config" {
+    for_each = each.value.type == "AMAZON_OPENSEARCH_SERVICE" ? [true] : []
+
+    content {
+      endpoint = each.value.endpoint
+      region   = lookup(each.value, "region", null)
+    }
+  }
 }
 
 # Resolvers
diff --git a/variables.tf b/variables.tf
index 8471fa7..9ee386c 100644
--- a/variables.tf
+++ b/variables.tf
@@ -230,6 +230,12 @@ variable "elasticsearch_allowed_actions" {
   default     = ["es:ESHttpDelete", "es:ESHttpHead", "es:ESHttpGet", "es:ESHttpPost", "es:ESHttpPut"]
 }
 
+variable "opensearchservice_allowed_actions" {
+  description = "List of allowed IAM actions for datasources type AMAZON_OPENSEARCH_SERVICE"
+  type        = list(string)
+  default     = ["es:ESHttpDelete", "es:ESHttpHead", "es:ESHttpGet", "es:ESHttpPost", "es:ESHttpPut"]
+}
+
 variable "iam_permissions_boundary" {
   description = "ARN for iam permissions boundary"
   type        = string
diff --git a/wrappers/main.tf b/wrappers/main.tf
index 4613965..219c423 100644
--- a/wrappers/main.tf
+++ b/wrappers/main.tf
@@ -36,6 +36,7 @@ module "wrapper" {
   lambda_allowed_actions             = try(each.value.lambda_allowed_actions, var.defaults.lambda_allowed_actions, ["lambda:invokeFunction"])
   dynamodb_allowed_actions           = try(each.value.dynamodb_allowed_actions, var.defaults.dynamodb_allowed_actions, ["dynamodb:GetItem", "dynamodb:PutItem", "dynamodb:DeleteItem", "dynamodb:UpdateItem", "dynamodb:Query", "dynamodb:Scan", "dynamodb:BatchGetItem", "dynamodb:BatchWriteItem"])
   elasticsearch_allowed_actions      = try(each.value.elasticsearch_allowed_actions, var.defaults.elasticsearch_allowed_actions, ["es:ESHttpDelete", "es:ESHttpHead", "es:ESHttpGet", "es:ESHttpPost", "es:ESHttpPut"])
+  opensearchservice_allowed_actions  = try(each.value.opensearchservice_allowed_actions, var.defaults.opensearchservice_allowed_actions, ["es:ESHttpDelete", "es:ESHttpHead", "es:ESHttpGet", "es:ESHttpPost", "es:ESHttpPut"])
   iam_permissions_boundary           = try(each.value.iam_permissions_boundary, var.defaults.iam_permissions_boundary, null)
   direct_lambda_request_template = try(each.value.direct_lambda_request_template, var.defaults.direct_lambda_request_template, <<-EOF
   {