K1A may refer to:

Haplogroup L-M20, also called haplogroup K1a GSR Class K1a, a type of a steam locomotive K1A, an variant of Daewoo Precision Industries K1 K1A, a postal code assigned to Government of Canada; see List of postal codes of Canada: K Line K1A, in Chengdu BRT Haplogroup K1a, a branch of subclade K1 in Haplogroup K (mtDNA)

See also KIA (disambiguation)