Tomáš Klobučník (born 21 June 1990 in Topoľčany) is a Slovak swimmer, who specializes in breaststroke events.

[3] Klobucnik is also a resident athlete for J&T Sport Team Bratislava, and is coached and trained by Gabriel Baran.

[1] Klobucnik qualified for the men's 200 m breaststroke at the 2012 Summer Olympics in London, by breaking a long-course Slovak record, eclipsing the FINA B-cut time of 2:13.10 at the European Championships in Debrecen, Hungary.

[4][5][6] He challenged seven other swimmers in the second heat, including four-time OIympian Jakob Jóhann Sveinsson of Iceland.

Klobucnik failed to advance into the semifinals, as he placed twenty-third overall in the preliminaries.