135th may refer to:
- 135th (2/1st South Western) Brigade, formation of the Territorial Force of the British Army
- 135th (Limerick) Regiment of Foot, infantry regiment of the British Army, created and promptly disbanded in 1796
- 135th (Middlesex) Battalion, CEF, unit in the Canadian Expeditionary Force during the First World War
- 135th Aero Squadron or 22d Tactical Drone Squadron, inactive United States Air Force unit
- 135th Airlift Group, airlift unit located at Warfield Air National Guard Base in Middle River, Maryland
- 135th Airlift Squadron, one of two flying units of the Maryland Air National Guard
- 135th Delaware General Assembly, meeting of the legislative branch of the Delaware states government
- 135th Georgia General Assembly succeeded the 134th and served as the precedent for the 136th General Assembly in 1981
- 135th Illinois Volunteer Infantry Regiment, infantry regiment that served in the Union Army during the American Civil War
- 135th Infantry Regiment (United States), infantry regiment in the Army National Guard
- 135th Kentucky Derby or 2009 Kentucky Derby
- 135th meridian east, line of longitude across the Arctic Ocean, Asia, the Pacific Ocean, Australasia, the Indian Ocean, the Southern Ocean and Antarctica
- 135th meridian west, line of longitude across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean and Antarctica
- 135th Ohio Infantry (or 135th OVI) was an infantry regiment in the Union Army during the American Civil War
- 135th Quartermaster Company or 87th Combat Sustainment Support Battalion (United States)
- 135th Street (IND Eighth Avenue Line), local station on the IND Eighth Avenue Line of the New York City Subway
- 135th Street (IRT Lenox Avenue Line), station on the IRT Lenox Avenue Line of the New York City Subway
- 135th Street (IRT Ninth Avenue Line), station on the demolished IRT Ninth Avenue Line
- 135th Street (Manhattan), New York
- 135th Sustainment Command (Expeditionary), subordinate unit of the 167th Theater Sustainment Command and the Alabama Army National Guard
- 2d Battalion, 135th Aviation Regiment (United States), Army helicopter battalion which deployed to Iraq
- Connecticut's 135th assembly district elects one member of the Connecticut House of Representatives
- Pennsylvania's 135th Representative District or Pennsylvania House of Representatives, District 135
See also
- 135 (number)
- AD 135, the year 135 (CXXXV) of the Julian calendar
- 135 BC