Kaloyan Toshkov Ivanov (born March 18, 1986) is a Bulgarian professional basketball player who currently plays for Trabzonspor of the Turkish Basketball League. Ivanov plays as power forward.
On July 20, 2010 he signed a two-year deal with Spanish Cajasol team. On May 25, 2011 Koloyan opted out of contract with the team. In August 2011 he signed a two-year contract with Lucentum Alicante.
On January 26, 2015, he signed with Trabzonspor of the Turkish Basketball League.
He is Dejan Ivanov's twin brother.