diff --git a/action.yml b/action.yml
index aec50b2..eafbbdc 100644
--- a/action.yml
+++ b/action.yml
@@ -15,8 +15,8 @@ inputs:
     required: true
   aws_iam_role_name:
     description: "Used to set up another local AWS profile for assuming another IAM role; required for cross-account k8s auth."
-  ecr_aws_account_id:
-    description: "If logging in to ECR, which AWS account ID the ECR repo is in."
+  ecr_aws_account_ids:
+    description: "A list of comma-separated AWS account IDs with which to perform docker login commands for ECR."
 runs:
   using: "node12"
   main: "build/index.js"
diff --git a/build/index.js b/build/index.js
index 5c339b1..26c857d 100644
--- a/build/index.js
+++ b/build/index.js
@@ -47,11 +47,13 @@ const setAWSAssumeRoleProfile = (awsIamRoleName, awsAccountId) => {
     fs.appendFileSync(confPath, profile);
     console.log("AWS assume role profile added to ~/.aws/config");
 };
-const dockerECRLogin = (ecrAwsAccountId, awsIamRoleName) => {
+const dockerECRLogin = (ecrAwsAccountIdsArray, awsIamRoleName) => {
     const awsProfile = awsIamRoleName || "default";
-    const loginPassword = shell(`aws ecr get-login-password --profile ${awsProfile}`).trim();
-    const loginResult = shell(`docker login -u AWS -p ${loginPassword} https://${ecrAwsAccountId}.dkr.ecr.eu-west-1.amazonaws.com`);
-    console.log(loginResult);
+    ecrAwsAccountIdsArray.forEach((ecrAwsAccountId) => {
+        const loginPassword = shell(`aws ecr get-login-password --profile ${awsProfile}`).trim();
+        const loginResult = shell(`docker login -u AWS -p ${loginPassword} https://${ecrAwsAccountId}.dkr.ecr.eu-west-1.amazonaws.com`);
+        console.log(loginResult);
+    });
 };
 const setKubernetesConfig = (awsAccountId, encodedKubeConfig, cluster) => {
     const kubeConfig = Buffer.from(encodedKubeConfig, "base64").toString();
@@ -64,7 +66,7 @@ const setKubernetesConfig = (awsAccountId, encodedKubeConfig, cluster) => {
     console.log("Kubernetes config written to ~/.kube/config");
 };
 const main = () => {
-    const { INPUT_AWS_ACCOUNT_ID: awsAccountId, INPUT_ECR_AWS_ACCOUNT_ID: ecrAwsAccountId, INPUT_AWS_ACCESS_KEY_ID: awsAccessKeyId, INPUT_AWS_SECRET_ACCESS_KEY: awsSecretAccessKey, INPUT_CLUSTER: cluster, INPUT_KUBE_CONFIG: encodedKubeConfig, INPUT_AWS_IAM_ROLE_NAME: awsIamRoleName, } = process.env;
+    const { INPUT_AWS_ACCOUNT_ID: awsAccountId, INPUT_ECR_AWS_ACCOUNT_IDS: ecrAwsAccountIds, INPUT_AWS_ACCESS_KEY_ID: awsAccessKeyId, INPUT_AWS_SECRET_ACCESS_KEY: awsSecretAccessKey, INPUT_CLUSTER: cluster, INPUT_KUBE_CONFIG: encodedKubeConfig, INPUT_AWS_IAM_ROLE_NAME: awsIamRoleName, } = process.env;
     if (!awsAccountId) {
         throw "aws-account-id must be set.";
     }
@@ -84,8 +86,9 @@ const main = () => {
     if (awsIamRoleName) {
         setAWSAssumeRoleProfile(awsIamRoleName, awsAccountId);
     }
-    if (ecrAwsAccountId) {
-        dockerECRLogin(ecrAwsAccountId, awsIamRoleName);
+    if (ecrAwsAccountIds) {
+        const ecrAwsAccountIdsArray = ecrAwsAccountIds.split(",");
+        dockerECRLogin(ecrAwsAccountIdsArray, awsIamRoleName);
     }
     setKubernetesConfig(awsAccountId, encodedKubeConfig, cluster);
 };
diff --git a/build/index.js.map b/build/index.js.map
index caf1779..d58f055 100644
--- a/build/index.js.map
+++ b/build/index.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index 66afd1d..5094e5b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -58,15 +58,20 @@ const setAWSAssumeRoleProfile = (
   console.log("AWS assume role profile added to ~/.aws/config")
 }
 
-const dockerECRLogin = (ecrAwsAccountId: string, awsIamRoleName?: string) => {
+const dockerECRLogin = (
+  ecrAwsAccountIdsArray: string[],
+  awsIamRoleName?: string
+) => {
   const awsProfile = awsIamRoleName || "default"
-  const loginPassword = shell(
-    `aws ecr get-login-password --profile ${awsProfile}`
-  ).trim()
-  const loginResult = shell(
-    `docker login -u AWS -p ${loginPassword} https://${ecrAwsAccountId}.dkr.ecr.eu-west-1.amazonaws.com`
-  )
-  console.log(loginResult)
+  ecrAwsAccountIdsArray.forEach((ecrAwsAccountId) => {
+    const loginPassword = shell(
+      `aws ecr get-login-password --profile ${awsProfile}`
+    ).trim()
+    const loginResult = shell(
+      `docker login -u AWS -p ${loginPassword} https://${ecrAwsAccountId}.dkr.ecr.eu-west-1.amazonaws.com`
+    )
+    console.log(loginResult)
+  })
 }
 
 const setKubernetesConfig = (
@@ -90,7 +95,7 @@ const setKubernetesConfig = (
 const main = () => {
   const {
     INPUT_AWS_ACCOUNT_ID: awsAccountId,
-    INPUT_ECR_AWS_ACCOUNT_ID: ecrAwsAccountId,
+    INPUT_ECR_AWS_ACCOUNT_IDS: ecrAwsAccountIds,
     INPUT_AWS_ACCESS_KEY_ID: awsAccessKeyId,
     INPUT_AWS_SECRET_ACCESS_KEY: awsSecretAccessKey,
     INPUT_CLUSTER: cluster,
@@ -118,8 +123,9 @@ const main = () => {
   if (awsIamRoleName) {
     setAWSAssumeRoleProfile(awsIamRoleName, awsAccountId)
   }
-  if (ecrAwsAccountId) {
-    dockerECRLogin(ecrAwsAccountId, awsIamRoleName)
+  if (ecrAwsAccountIds) {
+    const ecrAwsAccountIdsArray = ecrAwsAccountIds.split(",")
+    dockerECRLogin(ecrAwsAccountIdsArray, awsIamRoleName)
   }
   setKubernetesConfig(awsAccountId, encodedKubeConfig, cluster)
 }