Gustav Mendonça Wikheim (born 18 March 1993) is a Norwegian footballer who plays for Djurgårdens IF as a winger.

Wikheim made his debut for Strømsgodset on 10 April 2011 against Odd,[2] in a match his club won 2–0.

[3] He gradually played more and more for Strømsgodset, and got his major breakthrough in the 2014 season, when he featured in 27 of the 30 league matches for the club.

On 17 December 2015, Wikheim signed a contract lasting until June 2019 with Belgian club KAA Gent, in a €1.6 million deal.

[4][5] In the dying hours of the summer 2016 transfer deadline, Wikheim was presented in FC Midtjylland on a one-year loan with a buy-out option included from KAA Gent.