4A or IV-A may refer to:
4A, Ararat International Airlines' IATA airline designator 4A, a series of Toyota A engine produced by Toyota Motor Corporation (1982-2002) 4A Centre for Contemporary Asian Art, Sydney, Australia 4A Engine, a video game engine developed by 4A Games 4A Games, a video game development company in Ukraine Associated Actors and Artistes of America, also known as 4As, federation of American trade unions Calabarzon or Region IV-A, a Region in the Philippines Pixel 4a, an Android smartphone Vermont Route 4A, a highway in Vermont, U.S. Zeolite 4A, a sodium-type molecular sieve
See also 4A/OP, a radiative transfer model for the infrared Long March 4A, a Chinese rocket Stalag IV-A, a German prisoner of war camp TI-99/4A, a 1981 home computer AAAA (disambiguation) A4 (disambiguation) Iva (disambiguation)