Oleksandr Serhiyovich Horyainov (; born 29 June 1975) is a retired Ukrainian professional football goalkeeper and manager.
In 1996 he debuted for the Ukraine youth team. However it was not until 2010 when Horyainov finally debuted for the senior team. That day he became the oldest debutant for the senior team, surpassing the record set by Oleksandr Horshkov.