The International Optimist Dinghy Association (IODA) writes the Opti class rules. The current edition is the International Optimist Class Rules 2026, in force from January 1, 2026. You can open the 2026 rules as a PDF (World Sailing’s copy).
The 2026 edition brings in IODA’s digital Registration Book (CR 2.4.3(d)) and IODA equipment labels on GRP hulls, sails, spars and foils made from January 1, 2026. IODA’s 2026 Class Rules Changes lists every change.
Check the current rules. IODA updates the Opti class rules most years. Before each season, open the IODA Class Rules page and use the edition marked “current version.” The notice of race and sailing instructions for an event can add to the class rules.
Rigging your Opti? See How to Tie an Optimist Sail and our Optimist tuning guides.
