The R-15 was a submarine-launched ballistic missile (SLBM) design from the Soviet Union during the Cold War. It was not deployed. The R-15 was a project to develop an SLBM complex D-3 with the capability to be launched directly from the submarine while submerged. The development was authorized for OKB-586 in Dnipropetrovsk, Ukraine, on 20 March 1958 and cancelled before testing in December 1958.