225th may refer to:
Military units 225th (Kootenay) Battalion, CEF, a unit in the Canadian Expeditionary Force during the First World War 225th Brigade Support Battalion, a United States Army unit based at Schofield Barracks, Hawaii 225th Combat Communications Squadron (225 CBCS) is an Air National Guard combat communications unit located at Gadsden, Alabama 225th Engineer Brigade (United States), a combat heavy engineer brigade of the Louisiana Army National Guard 225th Brigade (United Kingdom), a British Army infantry formation during World War II 225th (Parachute) Field Ambulance, a Royal Army Medical Corps unit of the British airborne forces during the Second World War
Other uses 225th Street station, a local station on the IRT White Plains Road Line of the New York City Subway Marble Hill–225th Street station, a local station on the IRT Broadway – Seventh Avenue Line of the New York City Subway
See also 225 (number) 225, the year 225 (CCXXV) of the Julian calendar