'Ossining' was a US series of special forces undertakings by the Office of Strategic Services' Maritime Unit, under the command of Lieutenant Richard Kelly of the US Navy, against road and railway targets on the north coast of the Adriatic Sea and the Istrian peninsula of German-occupied Italy (June 1944/April 1945).

Including Italian men of the previous Brigata 'San Marco' special forces unit of the Italian navy, 'Ossining' also involved intelligence gathering and transport tasks for the benefit of partisan, Allied subversion teams ands other special forces.