Stadiums

Union have played at the Joseph Marien since 1919, tucked against the trees of the Parc Duden in Forest. Its Art Deco clubhouse façade dates from 1926 and is a protected heritage structure, which is why the ground cannot be meaningfully enlarged. A planned renovation was shelved and the club is instead pursuing a new stadium on the Bempt site, with the permit still in progress in 2026.

Because the ground falls short of UEFA requirements, Union's European home ties are staged at Anderlecht's Lotto Park, with the King Baudouin used in the past. League matches remain at the Joseph Marien.