Kain is a masculine given name. Notable people with the name include:
Kain Adom (born 2007), English footballer
Kain Colter (born 1990), American football player
Kain Kong, American bass player from The Lookouts
Kain Massin, Australian writer
Kain Medrano (born 2001), American football player
Kain O'Keeffe (born 1987), Australian actor
Kain Tapper (1930–2004), Finnish sculptor
Kain Taylor (born 1967), Australian footballer
Fictional characters:
Kain (Legacy of Kain) from the Legacy of Kain video game series
Kain Highwind in the Square Co., Ltd. game Final Fantasy IV
Kain Phalanx from Shadow Skill
Kain Pathos Crow, a dog-headed biochemist featured in several articles and stories produced for the SCP Foundation. Created by a retired administrator for the SCP Foundation website of the same username.