Ivan Mesík (born 1 June 2001) is a Slovak professional footballer who plays as a centre-back for Eredivisie club Heracles Almelo.

Mesík made his Fortuna Liga debut for Spartak against Nitra on 18 May 2019 playing the full 90 minutes of a 1–0 away win that was sealed by a goal by David Depetris.

He scored his first league goal against Nitra, in the third round, on 4 August 2019, in a 2–0 home win, after a corner by Marko Tešija.

[3] He also made appearances in the pre-season Czechoslovak Supercup, against Slavia Prague, as a late replacement for Jozef Menich,[4] as well as unsuccessful Europa League qualifying campaign, against both Radnik Bijeljina and Lokomotiv Plovdiv.

[8] On 5 June 2024, Mesík joined Eredivisie club Heracles Almelo on a four-year contract.