To set up Single Sign-On (SSO) with WorkOS, Okta, and Ruby, follow these steps: Install the WorkOS Ruby SDK, set secrets for authentication, configure an Okta connection to enable SSO, create a redirect URI, set up the frontend with React or your preferred framework, set up the backend using either AuthKit or standalone SSO API, test the connection using default Test Organization and active SSO connection, and handle the user's session. After setting up SSO, you can also implement logout, add social logins, access control, provisioning users automatically, handling failed authentication events, and more. For more detailed instructions, follow the Okta SAML integration guide, check out example applications, admin portal documentation, migration guides, passkeys, managing SAML X.509 certificates, and user management quickstart resources.