MK3

MK3 may refer to:


 * Mortal Kombat 3, the third game in the Mortal Kombat series
 * Mario Kart: Super Circuit, the third game in the Mario Kart series, released in 2001 for the Game Boy Advance
 * MAP kinase kinase kinase (MK3)
 * MAPK-activated protein kinase 3 (MK3)
 * Mark III (disambiguation) and Mark 3