diff --git a/compute/ecs_cluster/README.md b/compute/ecs_cluster/README.md
index 55fafe85..5db87802 100644
--- a/compute/ecs_cluster/README.md
+++ b/compute/ecs_cluster/README.md
@@ -263,6 +263,7 @@ module "api_service" {
 | public_alb_ssl_policy | SSL policy for HTTPS | `string` | `"ELBSecurityPolicy-TLS13-1-2-2021-06"` | no |
 | public_alb_idle_timeout | Idle timeout in seconds | `number` | `60` | no |
 | public_alb_ingress_cidr_blocks | Allowed IPv4 CIDR blocks | `list(string)` | `["0.0.0.0/0"]` | no |
+| public_alb_ingress_security_group_ids | Security group IDs allowed to access the public ALB | `list(string)` | `[]` | no |
 | public_alb_access_logs_enabled | Enable access logs | `bool` | `false` | no |
 | public_alb_access_logs_bucket_arn | S3 bucket ARN for access logs | `string` | `null` | no |
 | public_alb_web_acl_arn | WAFv2 Web ACL ARN | `string` | `null` | no |
@@ -277,6 +278,7 @@ module "api_service" {
 | private_alb_ssl_policy | SSL policy for HTTPS | `string` | `"ELBSecurityPolicy-TLS13-1-2-2021-06"` | no |
 | private_alb_idle_timeout | Idle timeout in seconds | `number` | `60` | no |
 | private_alb_ingress_cidr_blocks | Allowed IPv4 CIDR blocks | `list(string)` | `["10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"]` | no |
+| private_alb_ingress_security_group_ids | Security group IDs allowed to access the private ALB (e.g., CloudFront VPC origins) | `list(string)` | `[]` | no |
 | private_alb_access_logs_enabled | Enable access logs | `bool` | `false` | no |
 | private_alb_access_logs_bucket_arn | S3 bucket ARN for access logs | `string` | `null` | no |
 
diff --git a/compute/ecs_cluster/load_balancers.tf b/compute/ecs_cluster/load_balancers.tf
index a7b40da5..5ff09c5b 100644
--- a/compute/ecs_cluster/load_balancers.tf
+++ b/compute/ecs_cluster/load_balancers.tf
@@ -28,8 +28,9 @@ module "public_alb" {
   deletion_protection_enabled = var.load_balancer_deletion_protection_enabled
 
   # Security
-  ingress_cidr_blocks      = var.public_alb_ingress_cidr_blocks
-  ingress_ipv6_cidr_blocks = var.public_alb_ingress_ipv6_cidr_blocks
+  ingress_cidr_blocks        = var.public_alb_ingress_cidr_blocks
+  ingress_ipv6_cidr_blocks   = var.public_alb_ingress_ipv6_cidr_blocks
+  ingress_security_group_ids = var.public_alb_ingress_security_group_ids
 
   # Access logs
   access_logs_enabled    = var.public_alb_access_logs_enabled
@@ -69,8 +70,9 @@ module "private_alb" {
   deletion_protection_enabled = var.load_balancer_deletion_protection_enabled
 
   # Security
-  ingress_cidr_blocks      = var.private_alb_ingress_cidr_blocks
-  ingress_ipv6_cidr_blocks = var.private_alb_ingress_ipv6_cidr_blocks
+  ingress_cidr_blocks        = var.private_alb_ingress_cidr_blocks
+  ingress_ipv6_cidr_blocks   = var.private_alb_ingress_ipv6_cidr_blocks
+  ingress_security_group_ids = var.private_alb_ingress_security_group_ids
 
   # Access logs
   access_logs_enabled    = var.private_alb_access_logs_enabled
diff --git a/compute/ecs_cluster/rvn-ecs-cluster-definition.yml b/compute/ecs_cluster/rvn-ecs-cluster-definition.yml
index a808060b..240e1079 100644
--- a/compute/ecs_cluster/rvn-ecs-cluster-definition.yml
+++ b/compute/ecs_cluster/rvn-ecs-cluster-definition.yml
@@ -3,8 +3,8 @@ definition:
   name: ECS Cluster
   description: Production-ready AWS ECS cluster with Fargate, Fargate Spot, optional EC2 capacity, and shared load balancers.
 release:
-  version: 0.5.0
-  description: "BREAKING: Rename ec2_managed_termination_protection to ec2_managed_termination_protection_enabled and ec2_managed_scaling_status to ec2_managed_scaling_enabled; both inputs now accept booleans instead of ENABLED or DISABLED strings."
+  version: 0.5.2
+  description: "Add private_alb_ingress_security_group_ids input (and public_alb_ingress_security_group_ids Terraform variable) to allow ALB ingress rules that reference source security groups, such as the CloudFront VPC origins security group."
 module:
   inputs:
     - id: network
@@ -342,6 +342,15 @@ module:
       show_when:
         private_alb_enabled: true
       type: string_array
+    - add_button_label: Add security group
+      collapsible: true
+      description: Security groups whose members can access the private ALB. Useful for sources without static CIDRs, such as CloudFront VPC origins.
+      id: private_alb_ingress_security_group_ids
+      label: Ingress security groups
+      placeholder: sg-...
+      show_when:
+        private_alb_enabled: true
+      type: string_array
     - collapsible: true
       description: Idle timeout for the private ALB.
       id: private_alb_idle_timeout
@@ -671,6 +680,7 @@ module:
         private_alb_idle_timeout: << module.input.private_alb_idle_timeout >>
         private_alb_ingress_cidr_blocks: << module.input.private_alb_ingress_cidr_blocks >>
         private_alb_ingress_ipv6_cidr_blocks: << module.input.private_alb_ingress_ipv6_cidr_blocks >>
+        private_alb_ingress_security_group_ids: << module.input.private_alb_ingress_security_group_ids >>
         private_alb_ssl_policy: << module.input.private_alb_ssl_policy >>
         private_nlb_access_logs_bucket_arn: << module.input.private_nlb_access_logs_bucket_arn >>
         private_nlb_elastic_ip_allocation_ids: << module.input.private_nlb_elastic_ip_allocation_ids >>
diff --git a/compute/ecs_cluster/tests/basic.tftest.hcl b/compute/ecs_cluster/tests/basic.tftest.hcl
index b1a84d2b..5a660463 100644
--- a/compute/ecs_cluster/tests/basic.tftest.hcl
+++ b/compute/ecs_cluster/tests/basic.tftest.hcl
@@ -747,6 +747,47 @@ run "private_alb_custom_settings" {
   }
 }
 
+# Test 28b: Private ALB ingress rules referencing source security groups
+run "private_alb_ingress_security_groups" {
+  command = plan
+
+  variables {
+    private_alb_enabled                    = true
+    private_alb_https_enabled              = true
+    private_alb_certificate_arns           = ["arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012"]
+    private_alb_ingress_security_group_ids = ["sg-0123456789abcdef0"]
+  }
+
+  assert {
+    condition = length([
+      for rule in module.private_alb[0].module.security_group.aws_vpc_security_group_ingress_rule.this : rule
+      if rule.referenced_security_group_id == "sg-0123456789abcdef0"
+    ]) == 2
+    error_message = "Private ALB should have HTTP and HTTPS ingress rules referencing the source security group"
+  }
+}
+
+# Test 28c: Public ALB ingress rules referencing source security groups
+run "public_alb_ingress_security_groups" {
+  command = plan
+
+  variables {
+    public_alb_enabled                    = true
+    public_alb_https_enabled              = true
+    public_alb_certificate_arns           = ["arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012"]
+    public_subnet_ids                     = ["subnet-public1", "subnet-public2"]
+    public_alb_ingress_security_group_ids = ["sg-0123456789abcdef0"]
+  }
+
+  assert {
+    condition = length([
+      for rule in module.public_alb[0].module.security_group.aws_vpc_security_group_ingress_rule.this : rule
+      if rule.referenced_security_group_id == "sg-0123456789abcdef0"
+    ]) == 2
+    error_message = "Public ALB should have HTTP and HTTPS ingress rules referencing the source security group"
+  }
+}
+
 ################################################################################
 # Combined Configuration Tests
 ################################################################################
diff --git a/compute/ecs_cluster/variables.tf b/compute/ecs_cluster/variables.tf
index eb7777ed..fff9d656 100644
--- a/compute/ecs_cluster/variables.tf
+++ b/compute/ecs_cluster/variables.tf
@@ -453,6 +453,17 @@ variable "public_alb_ingress_ipv6_cidr_blocks" {
   default     = ["::/0"]
 }
 
+variable "public_alb_ingress_security_group_ids" {
+  type        = list(string)
+  description = "Security group IDs whose members are allowed to access the public ALB."
+  default     = []
+
+  validation {
+    condition     = alltrue([for sg in var.public_alb_ingress_security_group_ids : can(regex("^sg-", sg))])
+    error_message = "All public_alb_ingress_security_group_ids must be valid security group IDs starting with 'sg-'."
+  }
+}
+
 variable "public_alb_access_logs_enabled" {
   type        = bool
   description = "Enable access logging for the public ALB."
@@ -542,6 +553,17 @@ variable "private_alb_ingress_ipv6_cidr_blocks" {
   default     = []
 }
 
+variable "private_alb_ingress_security_group_ids" {
+  type        = list(string)
+  description = "Security group IDs whose members are allowed to access the private ALB. Useful for sources without static CIDRs, such as CloudFront VPC origins."
+  default     = []
+
+  validation {
+    condition     = alltrue([for sg in var.private_alb_ingress_security_group_ids : can(regex("^sg-", sg))])
+    error_message = "All private_alb_ingress_security_group_ids must be valid security group IDs starting with 'sg-'."
+  }
+}
+
 variable "private_alb_access_logs_enabled" {
   type        = bool
   description = "Enable access logging for the private ALB."
diff --git a/networking/alb/README.md b/networking/alb/README.md
index d3bf1c0c..4ac36d19 100644
--- a/networking/alb/README.md
+++ b/networking/alb/README.md
@@ -291,6 +291,7 @@ spec:
 |------|-------------|------|---------|----------|
 | ingress_cidr_blocks | IPv4 CIDR blocks allowed to access the ALB | `list(string)` | `["0.0.0.0/0"]` | no |
 | ingress_ipv6_cidr_blocks | IPv6 CIDR blocks allowed to access the ALB | `list(string)` | `["::/0"]` | no |
+| ingress_security_group_ids | Security group IDs whose members are allowed to access the ALB | `list(string)` | `[]` | no |
 
 ### Access Logs
 
diff --git a/networking/alb/security_group.tf b/networking/alb/security_group.tf
index 965ebb53..9b7ad9bf 100644
--- a/networking/alb/security_group.tf
+++ b/networking/alb/security_group.tf
@@ -53,6 +53,26 @@ module "security_group" {
         ip_protocol = "tcp"
         cidr_ipv6   = cidr
       }
+    ] : [],
+    # HTTP ingress (security groups)
+    local.create_http_listener ? [
+      for sg in var.ingress_security_group_ids : {
+        description                  = "Allow HTTP traffic from security group ${sg}"
+        from_port                    = var.http_listener_port
+        to_port                      = var.http_listener_port
+        ip_protocol                  = "tcp"
+        referenced_security_group_id = sg
+      }
+    ] : [],
+    # HTTPS ingress (security groups)
+    local.create_https_listener ? [
+      for sg in var.ingress_security_group_ids : {
+        description                  = "Allow HTTPS traffic from security group ${sg}"
+        from_port                    = var.https_listener_port
+        to_port                      = var.https_listener_port
+        ip_protocol                  = "tcp"
+        referenced_security_group_id = sg
+      }
     ] : []
   )
 }
diff --git a/networking/alb/tests/basic.tftest.hcl b/networking/alb/tests/basic.tftest.hcl
index fe3572d5..edb4c548 100644
--- a/networking/alb/tests/basic.tftest.hcl
+++ b/networking/alb/tests/basic.tftest.hcl
@@ -561,3 +561,43 @@ run "waf_fail_open" {
     error_message = "ALB should have WAF fail open enabled"
   }
 }
+
+# Test 29: Ingress rules referencing source security groups
+run "ingress_security_groups" {
+  command = plan
+
+  variables {
+    https_listener_enabled     = true
+    certificate_arns           = ["arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012"]
+    ingress_security_group_ids = ["sg-0123456789abcdef0"]
+  }
+
+  assert {
+    condition = length([
+      for rule in module.security_group.aws_vpc_security_group_ingress_rule.this : rule
+      if rule.referenced_security_group_id == "sg-0123456789abcdef0"
+    ]) == 2
+    error_message = "Should create HTTP and HTTPS ingress rules referencing the source security group"
+  }
+
+  assert {
+    condition = length([
+      for rule in module.security_group.aws_vpc_security_group_ingress_rule.this : rule
+      if rule.referenced_security_group_id == "sg-0123456789abcdef0" && rule.from_port == 443
+    ]) == 1
+    error_message = "Should create an HTTPS ingress rule referencing the source security group"
+  }
+}
+
+# Test 30: No security group referenced ingress rules by default
+run "no_ingress_security_groups_by_default" {
+  command = plan
+
+  assert {
+    condition = length([
+      for rule in module.security_group.aws_vpc_security_group_ingress_rule.this : rule
+      if rule.referenced_security_group_id != null
+    ]) == 0
+    error_message = "Should not create security group referenced ingress rules by default"
+  }
+}
diff --git a/networking/alb/tests/validation.tftest.hcl b/networking/alb/tests/validation.tftest.hcl
new file mode 100644
index 00000000..2fbc6607
--- /dev/null
+++ b/networking/alb/tests/validation.tftest.hcl
@@ -0,0 +1,26 @@
+# ALB variable validation tests
+
+mock_provider "aws" {
+  override_resource {
+    target = aws_lb.this
+    values = {
+      arn = "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/test-alb/1234567890123456"
+    }
+  }
+}
+
+variables {
+  name       = "test-alb"
+  vpc_id     = "vpc-12345678"
+  subnet_ids = ["subnet-12345678", "subnet-87654321"]
+}
+
+run "duplicate_ingress_security_groups" {
+  command = plan
+
+  variables {
+    ingress_security_group_ids = ["sg-0123456789abcdef0", "sg-0123456789abcdef0"]
+  }
+
+  expect_failures = [var.ingress_security_group_ids]
+}
diff --git a/networking/alb/variables.tf b/networking/alb/variables.tf
index f06dd89a..8e204771 100644
--- a/networking/alb/variables.tf
+++ b/networking/alb/variables.tf
@@ -243,6 +243,17 @@ variable "ingress_ipv6_cidr_blocks" {
   default     = null
 }
 
+variable "ingress_security_group_ids" {
+  type        = list(string)
+  description = "A list of security group IDs whose members are allowed to access the ALB. Ingress rules are created on each enabled listener port."
+  default     = []
+
+  validation {
+    condition     = length(distinct(var.ingress_security_group_ids)) == length(var.ingress_security_group_ids) && alltrue([for sg in var.ingress_security_group_ids : can(regex("^sg-", sg))])
+    error_message = "All ingress_security_group_ids must be unique, valid security group IDs starting with 'sg-'."
+  }
+}
+
 ################################################################################
 # Access Logs
 ################################################################################