GitHub Actions OIDC integration with AWS IAM eliminates the need for long-lived access keys stored as repository secrets. This article walks through a production-ready setup: configuring the OIDC provider in AWS, creating an IAM role with trust policy scoped to your repository and branch, and writing workflow YAML that assumes the role via the official configure-aws-credentials action. We cover least-privilege permissions, environment-based role separation, and audit logging best practices. The article includes a complete SAM template snippet and a working GitHub Actions workflow example you can adapt to your own projects.