Use DetachUserPolicy with an AWS SDK or CLI

To detach a policy from a user

This example removes the managed policy with the ARN arn:aws:iam::123456789012:policy/TesterPolicy from the user Bob.

aws iam detach-user-policy \
    --user-name Bob \
    --policy-arn arn:aws:iam::123456789012:policy/TesterPolicy

This command produces no output.

For more information, see Changing permissions for an IAM user in the AWS IAM User Guide.

Example 1: This example detaches the managed policy whose ARN is arn:aws:iam::123456789012:policy/TesterPolicy from the IAM user named Bob.

Unregister-IAMUserPolicy -UserName Bob -PolicyArn arn:aws:iam::123456789012:policy/TesterPolicy

Example 2: This example finds all the managed policies that are attached to the IAM user named Theresa and detaches those policies from the user.

Get-IAMAttachedUserPolicyList -UserName Theresa | Unregister-IAMUserPolicy -Username Theresa

def detach_policy(user_name, policy_arn):
    """
    Detaches a policy from a user.

    :param user_name: The name of the user.
    :param policy_arn: The Amazon Resource Name (ARN) of the policy.
    """
    try:
        iam.User(user_name).detach_policy(PolicyArn=policy_arn)
        logger.info("Detached policy %s from user %s.", policy_arn, user_name)
    except ClientError:
        logger.exception(
            "Couldn't detach policy %s from user %s.", policy_arn, user_name
        )
        raise

  # Detaches a policy from a user
  #
  # @param user_name [String] The name of the user
  # @param policy_arn [String] The ARN of the policy to detach
  # @return [Boolean] true if the policy was successfully detached, false otherwise
  def detach_user_policy(user_name, policy_arn)
    @iam_client.detach_user_policy(
      user_name: user_name,
      policy_arn: policy_arn
    )
    @logger.info("Policy '#{policy_arn}' detached from user '#{user_name}' successfully.")
    true
  rescue Aws::IAM::Errors::NoSuchEntity
    @logger.error('Error detaching policy: Policy or user does not exist.')
    false
  rescue Aws::IAM::Errors::ServiceError => e
    @logger.error("Error detaching policy from user '#{user_name}': #{e.message}")
    false
  end

pub async fn detach_user_policy(
    client: &iamClient,
    user_name: &str,
    policy_arn: &str,
) -> Result<(), iamError> {
    client
        .detach_user_policy()
        .user_name(user_name)
        .policy_arn(policy_arn)
        .send()
        .await?;

    Ok(())
}