Matic Sirnik (born January 28, 1991, in Ljubljana, SR Slovenia, SFR Yugoslavia) is a Slovenian basketball player, 2.00 m tall.
Sirnik began his career playing with the KK Janče and Union Olimpija as a junior.
Sirnik debuted in the UPC Telemach League in the 2007-08 season with Union Olimpija.
He won the Slovenian championship and Cup with Union Olimpija that year.
He made his Euroleague debut on January 8, 2009, against Fenerbahce Ulker.