The R.O.C. Kosmos (Regatta of Champions - Kosmos) is a worldwide subsidiary qualification event for the Regatta of Champions (The R.O.C.), specifically for Optimist sailors. Introduced in 2024, this event was created to establish a high-level qualification system, ensuring the best selection of the Elite 45 Optimist Sailors from around the world.

R.O.C. Kosmos is open to all Optimist sailors and follows the same format and sailing rules as The R.O.C.. Currently held in Europe, the goal is to expand qualification events across all continents, providing more sailors with the opportunity to compete at the highest level.