Dmitry Donskoy (ТК-208) is a retired submarine that was the lead ship of the Project 941 Akula class of the Russian Navy and formerly the Soviet Navy. The boat was laid down at the Sevmash shipyard in Severodvinsk on 30 June 1976, launched on 23 September 1980, and commissioned on 29 December 1981, with the designation TK-208. It spent its entire career with the Northern Fleet after entering service in February 1982, and received the name Dmitry Donskoy in July 2002.

The submarine underwent modernization at the Sevmash shipyard starting from 1990, but due to delays caused by the fall of the Soviet Union, the refit was not completed until 2002. It was upgraded to carry and test the RSM-56 Bulava SLBMs, which replaced the R-39 in the Russian Navy. Dmitry Donskoy was used as a weapons testing platform for the main tests of the new Bulava missile and served in that role from 2003 to 2010. After that, it was used for ceremonial events and assisting the sea trials of newer submarines, including those of the Borei class and Yasen class. Dmitry Donskoy finished its last known assignment in September 2022.

The submarine was decommissioned on 6 February 2023 and was left docked at Severodvinsk. Before that it had been the last remaining Typhoon-class submarine on active service, making it the largest active submarine in the world by displacement. After its decommissioning there was a lobbying effort by veterans' groups for the Russian government to preserve it as a museum. In March 2025 it was announced that plans are being made to convert Dmitry Donskoy into a museum ship and put it on display at the Peter the Great Central Naval Museum in Saint Petersburg.