Martin Koscelník (born 2 March 1995) is a Slovak professional footballer who plays as a right-back for Czech First League club Slovácko, and the Slovakia national team.
Koscelník made his Slovak Super Liga debut for Zemplín Michalovce against AS Trenčín on 18 July 2015, only to be replaced in the second half by Martin Regáli.
[3] On 25 August 2020, Koscelník received his first call-up to the Slovak senior squad by coach Pavel Hapal for the Nations League matches against Czech Republic and Israel.
[4] The same year on 4 September, he debuted in a 2020–21 UEFA Nations League match against neighbours Czech Republic.
[5] On 7 September 2021, Koscelník scored his first international goal in a 2022 FIFA World Cup qualifier against Cyprus, ending in a 2–0 victory for the Slovaks.