Nikola Tkalčić (born 3 December 1989) is a Croatian football defender who plays for Swedish club Sylvia.

[1] He started his senior career in 2008 with NK Varteks, which changed its name to Varaždin during his tenure, before folding in 2015 (no relation to his current club).

[3] During his first senior season he was loaned out to their fourth-tier feeder team Sloboda Varaždin, which emerged as champions of their league, before returning to Varteks to play in the top-tier Prva HNL.

[5] Tkalčić moved to the Swedish team IFK Norrköping on the last day of the 2011 summer transfer window, missing all but two of the remaining matches of the 2011 season, the first and the last.

[15] Tkalčić was capped once for the Croatia U19 team in a 16.4.2008 friendly with Hungary U19, coming in the 59th minute of the 1–0 away win for Ivan Tomečak.