diff --git a/cluster-autoscaler/cloudprovider/cloudstack/README.md b/cluster-autoscaler/cloudprovider/cloudstack/README.md
index 1b05a2293424..c2063377455e 100644
--- a/cluster-autoscaler/cloudprovider/cloudstack/README.md
+++ b/cluster-autoscaler/cloudprovider/cloudstack/README.md
@@ -28,9 +28,13 @@ that is suitable for your environment.
 api-url = <CloudStack API URL>
 api-key = <CloudStack API Key>
 secret-key = <CloudStack API Secret>
+project-id = <CloudStack Project ID>  # Optional: required for multi-project environments
 ```
 The access token needs to be able to execute the `listKubernetesClusters` and `scaleKubernetesCluster` APIs.
 
+**Note:** The `project-id` parameter is optional but required when working with clusters in CloudStack projects. 
+If not specified, the API will use the default project associated with the API credentials.
+
 To create the secret, use the following command:
 ```bash
 kubectl -n kube-system create secret generic cloudstack-secret --from-file=cloud-config
diff --git a/cluster-autoscaler/cloudprovider/cloudstack/cloudstack_option.go b/cluster-autoscaler/cloudprovider/cloudstack/cloudstack_option.go
index c5790a297071..84793b2c0b31 100644
--- a/cluster-autoscaler/cloudprovider/cloudstack/cloudstack_option.go
+++ b/cluster-autoscaler/cloudprovider/cloudstack/cloudstack_option.go
@@ -97,6 +97,7 @@ func createConfig(opts ...option) (*managerConfig, error) {
 			APIKey:    config.Global.APIKey,
 			SecretKey: config.Global.SecretKey,
 			Endpoint:  config.Global.APIURL,
+			ProjectID: config.Global.ProjectID,
 		}
 	}
 
diff --git a/cluster-autoscaler/cloudprovider/cloudstack/service/cks.go b/cluster-autoscaler/cloudprovider/cloudstack/service/cks.go
index 5c9920ad786f..130535de8b60 100644
--- a/cluster-autoscaler/cloudprovider/cloudstack/service/cks.go
+++ b/cluster-autoscaler/cloudprovider/cloudstack/service/cks.go
@@ -74,7 +74,8 @@ type VirtualMachine struct {
 
 // cksService implements the CKSService interface
 type cksService struct {
-	client APIClient
+	client    APIClient
+	projectID string
 }
 
 func virtaulMachinesToMap(vms []*VirtualMachine) map[string]*VirtualMachine {
@@ -89,9 +90,14 @@ func virtaulMachinesToMap(vms []*VirtualMachine) map[string]*VirtualMachine {
 
 func (service *cksService) GetClusterDetails(clusterID string) (*Cluster, error) {
 	var out ListClusterResponse
-	_, err := service.client.NewRequest("listKubernetesClusters", map[string]string{
+	params := map[string]string{
 		"id": clusterID,
-	}, &out)
+	}
+	if service.projectID != "" {
+		params["projectid"] = service.projectID
+	}
+
+	_, err := service.client.NewRequest("listKubernetesClusters", params, &out)
 
 	if err != nil {
 		return nil, fmt.Errorf("Unable to fetch cluster details : %v", err)
@@ -108,10 +114,15 @@ func (service *cksService) GetClusterDetails(clusterID string) (*Cluster, error)
 
 func (service *cksService) ScaleCluster(clusterID string, workerCount int) (*Cluster, error) {
 	var out ClusterResponse
-	_, err := service.client.NewRequest("scaleKubernetesCluster", map[string]string{
+	params := map[string]string{
 		"id":   clusterID,
 		"size": strconv.Itoa(workerCount),
-	}, &out)
+	}
+	if service.projectID != "" {
+		params["projectid"] = service.projectID
+	}
+
+	_, err := service.client.NewRequest("scaleKubernetesCluster", params, &out)
 
 	if err != nil {
 		return nil, fmt.Errorf("Unable to scale cluster : %v", err)
@@ -123,10 +134,15 @@ func (service *cksService) ScaleCluster(clusterID string, workerCount int) (*Clu
 
 func (service *cksService) RemoveNodesFromCluster(clusterID string, nodeIDs ...string) (*Cluster, error) {
 	var out ClusterResponse
-	_, err := service.client.NewRequest("scaleKubernetesCluster", map[string]string{
+	params := map[string]string{
 		"id":      clusterID,
 		"nodeids": strings.Join(nodeIDs[:], ","),
-	}, &out)
+	}
+	if service.projectID != "" {
+		params["projectid"] = service.projectID
+	}
+
+	_, err := service.client.NewRequest("scaleKubernetesCluster", params, &out)
 	if err != nil {
 		return nil, fmt.Errorf("Unable to delete %v from cluster : %v", nodeIDs, err)
 	}
@@ -143,6 +159,7 @@ func (service *cksService) Close() {
 func NewCKSService(config *Config) CKSService {
 	client := NewAPIClient(config)
 	return &cksService{
-		client: client,
+		client:    client,
+		projectID: config.ProjectID,
 	}
 }
diff --git a/cluster-autoscaler/cloudprovider/cloudstack/service/client.go b/cluster-autoscaler/cloudprovider/cloudstack/service/client.go
index a794047674ca..e5e374165258 100644
--- a/cluster-autoscaler/cloudprovider/cloudstack/service/client.go
+++ b/cluster-autoscaler/cloudprovider/cloudstack/service/client.go
@@ -49,6 +49,7 @@ type Config struct {
 	APIKey       string
 	SecretKey    string
 	Endpoint     string
+	ProjectID    string
 	Timeout      int
 	PollInterval int
 }