Single sign-on (SSO) is a user authentication technique that allows individuals to access multiple applications using a single set of login credentials, thereby reducing password fatigue and enhancing security through measures like multi-factor authentication (MFA). The process involves establishing trust between a service provider, such as an application, and an identity provider like FusionAuth, using cryptographic credentials. This article provides a comprehensive guide on implementing SSO in a Laravel web application using FusionAuth as the OpenID Connect (OIDC) provider. It outlines the necessary steps, from configuring Docker and FusionAuth, to setting up and testing the Laravel application integrated with FusionAuth. The tutorial also covers the use of Laravel Socialite to authenticate users via OAuth providers, including FusionAuth, and highlights the benefits of SSO in streamlining access to applications and reducing IT support burden.