Junior Optimist International (JOI) is an active youth service organization that was created in 1988 and is affiliated with Optimist International, its sponsor. The current Junior Optimist International President is Sydney Mafong from San Diego, California, with the 2025-2026 JOI theme being "Beyond Borders with Optimism." There are more than 18,500 members in over 675 communities around the world.