K20 may refer to:

Fairchild K-20, an aerial camera used during World War II , an M-class submarine of the Royal Navy K-20 (Kansas highway) K-20: Legend of the Mask, a 2008 Japanese film K20, a model of Honda K engine K20 camouflage, a Vietnamese camouflage pattern K20 Center, an American research institute Kaman K-20, an American helicopter Qiantu K20, a Chinese subcompact hatchback Redmi K20, a Chinese smartphone