Implementing access control in DevSecOps pipelines starts with the principle of least privilege, ensuring users and tools have only the permissions they truly need. Role-Based Access Control (RBAC) should be applied across source control, CI/CD tools, cloud platforms, and artifact repositories. Integrate identity providers with multi-factor authentication for stronger security. Secrets must be managed using vaults instead of hardcoding credentials. Regular access reviews and automated policy enforcement help prevent privilege creep. Teams should also log and monitor access activities to detect misuse early. Proper DevSecOps Training and Certification helps professionals design secure pipelines that balance speed, collaboration, and compliance effectively.