IDK

IDK is a three-letter initialism or abbreviation which may refer to:

Music

 * IDK (rapper), British-American rapper
 * "IDK" (song), a 2020 song by Lil Tecca
 * "IDK", a 2021 song by Gin Lee
 * "IDK Y", a 2022 song by Joel Deleōn

Other Uses

 * Abbreviation for I Don't Know
 * Indulkana Airport (IATA: IDK), in Indulkana, South Australia, Australia; see List of airports by IATA airport code: I
 * Internationale der Kriegsdienstgegner/innen, the German section of War Resisters' International