225th

225th may refer to:


 * 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 Independent Infantry Brigade (Home), a British Army formation during World War II
 * 225th Street (IRT White Plains Road Line), a local station on the IRT White Plains Road Line of the New York City Subway
 * Marble Hill – 225th Street (IRT Broadway – Seventh Avenue Line), a local station on the New York City Subway