The M4 was a French submarine-launched ballistic missile (SLBM) deployed on the nuclear Redoutable-class submarines (except the Redoutable herself, which was not refitted). They entered service on 1 May 1985. They were the first French MIRV-capable nuclear missiles, with six 150 kilotonne warheads. They were replaced by the improved M45 (missile) which was in service aboard the Triomphant-class submarine.
== Operators == France French Navy