427th

427th may refer to:
 * 427th Aircraft Sustainment Group, inactive United States Air Force unit
 * 427th Air Refueling Squadron, inactive United States Air Force unit
 * 427th Bombardment Squadron, active United States Air Force unit
 * 427th (Durham) Coast Regiment, Royal Artillery
 * 427th (East Lancashire) Field Company, Royal Engineers
 * 427th Maryland General Assembly, convened in a regular session on January 13, 2010
 * 427th Reconnaissance Squadron, active United States Air Force unit
 * 427th Special Operations Squadron (427th SOS), direct reporting unit of the Air Force Special Operations Command