Nikola Vasilj (pronounced [nǐkola ʋǎsiʎ]; born 2 December 1995) is a Bosnian professional footballer who plays as a goalkeeper for Bundesliga club FC St. Pauli and the Bosnia and Herzegovina national team.

Vasilj started his professional career at Zrinjski Mostar, who loaned him to Igman Konjic in 2014 and to Branitelj in 2015.

Vasilj started playing football at a local club, before joining the youth academy of his hometown team Zrinjski Mostar in 2010.

[8] He made his official debut for the team on 25 July against Holstein Kiel and kept a clean sheet.

[13] In March 2021, he received his first senior call-up, for 2022 FIFA World Cup qualifiers against Finland and France and a friendly game against Costa Rica.