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The Morane-Saulnier M.S.330 was a parasol wing trainer designed to replace the M.S.230 in French service, but that failed to live up to expectations and didn't enter production.
In 1929 the French military issued a specification for a new training aircraft to replace the M.S.230, which was only just entering service. Morane-Saulnier responded with the M.S.330. This aircraft was similar to the M.S.230, with a swept-back parasol wing, but it had a new wing profile and was powered by a fully cowled Salmson 9Ab radial engine.
Tests revealed that the M.S.330 tended to get into an uncontrollable flat spin after some manoeuvres, and development came to an end. Two versions with alternative engines (the M.S.331 and M.S.332) were produced), but neither of these was any more successful, and the M.S.230 stayed in production throughout the 1930s.