The 2015–16 season was Oud-Heverlee Leuven's 14th competitive season in professional football and the team's fourth season in the Belgian Pro League. Following a loss on the final day of the regular season at home against Club Brugge, OH Leuven dropped into 16th place and was relegated as Westerlo beat Waasland-Beveren. OH Leuven also had a mediocre cup run, struggling past Belgian Second Division team Lommel United before falling 1-0 to Mouscron-Péruwelz.

Following the promotion from the Belgian Second Division on 26 May 2015 by virtue of winning the play-offs, only few players were deemed capable of competing at the highest level. The squad consisted of many decent players, but at least ten new players would need to be signed and only former Belgian international goalkeeper Logan Bailly and young wingback Dion Cools were often named as having sufficient skills. Both players would leave OH Leuven throughout the summer however, as Bailly was signed as a back-up for Craig Gordon by Scottish giants Celtic, while 19-year-old Cools was signed by Club Brugge because of his great potential. Other departures included fan favorite Kenny Thompson and striker on loan Giuseppe Rossini who had both announced their departure before the promotion was achieved while secondary striker Ibrahim Somé and young goalkeeper Senne Vits also left the team soon after the promotion as they were signed by WS Brussels and Standard Liège respectively. The contracts of Abdul-Yakuni Iddi, David Wijns and Ben Yagan were not renewed and the players released, while youngster Simon Bracke was loaned to Second Division team ASV Geel and defender Matthias Trenson was given a free transfer to Belgian Third Division team Hasselt.

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