Aya Koyama (小山 亜矢, Koyama Aya, 8 March 1973 – 27 August 2018), better known by her stage name Aliya (亜利弥’), was a Japanese female mixed martial artist and a professional wrestler. She started her career as a pro wrestler in 1996 before starting to compete in mixed martial arts from 2001. Aya Koyama died on 27 August 2018 at the age of 45 due to cancer.