District 3 can refer to:
Arts and entertainment District3 (formerly GMD3), a three-piece harmony boy band on the ninth UK series of The X Factor District 3 (The Hunger Games), a fictional district in the Hunger Games books and films
Places III District, Turku, in Finland District 3 (New York City Council), in the United States District 3, Düsseldorf, in Germany District 3, Grand Bassa County, in Liberia District 3, Ho Chi Minh City, in Vietnam District 3, Malta, an electoral district of Malta District 3, Malta, a police district of Malta District 3, Tehran, a district of the city of Tehran, Iran Wiedikon, also known as District 3, in Zürich, Switzerland
See also District 3 Innovation Centre, a startup incubator and innovation hub in Concordia University, Montreal, Canada District 13 (disambiguation) Sector 3 (disambiguation) 3rd district (disambiguation)