191st may refer to:
Military units 191st (Southern Alberta) Battalion, CEF, a unit in the Canadian Expeditionary Force during the First World War 191st (Hertfordshire and Essex Yeomanry) Field Regiment, Royal Artillery, a British unit of World War II 191st Air Refueling Squadron, a unit of the Utah Air National Guard 191st Airlift Group, an airlift unit located at Selfridge ANGB, Michigan 191st Infantry Brigade (United States), formed as part of the United States Army Reserve's 96th Division 191st Ohio Infantry Regiment (or 191st OVI), an infantry regiment in the Union Army during the American Civil War
Other uses 191st Street station, a station on the IRT Broadway – Seventh Avenue Line of the New York City Subway
See also 191 (number) AD 191, the year 191 (CXCI) of the Julian calendar 191 BC
July 10, 191st day of the year in a standard year