191st

191st may refer to:


 * 191st (Southern Alberta) Battalion, CEF, a unit in the Canadian Expeditionary Force during the First World War
 * 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 (or 191st OVI), an infantry regiment in the Union Army during the American Civil War
 * 191st Street (IRT Broadway – Seventh Avenue Line), a station on the IRT Broadway – Seventh Avenue Line of the New York City Subway