Asenov () is a Bulgarian surname derived from the personal name Asen. Notable people with the surname include:
Borislav Asenov (born 1959), Bulgarian cyclist Dimitar Nikolov Asenov, known as Hadzhi Dimitar (1840–1868), Bulgarian revolutionary Krastyo Asenov (1877–1903), Bulgarian revolutionary, nephew of Dimitar Stefan Asenov (born 1972), Bulgarian modern pentathlete Yordan Asenov (1869–1936), Bulgarian revolutionary, brother of Krastyo Venka Asenova (1930–1986), Bulgarian women chess grandmaster
See also Asenov, Veliko Tarnovo, district in Bulgaria