The Cuban National Series (Spanish: Serie Nacional de Béisbol, SNB) is a domestic baseball competition in Cuba. Formed after the dissolution of the Cuban League in the wake of the Cuban Revolution, the National Series is a part of the Cuban baseball league system. Between 1961 and 2021, it was the top-level winter league in Cuba; it now operates as a summer league, with the top six National Series teams qualifying for the Cuban Elite League.