Rot-Weiß Oberhausen is a German association football club in Oberhausen, North Rhine-Westphalia. The club was formed as Oberhausener SV in December 1904 out of the merger of Emschertaler SV and the football enthusiasts of Oberhausener TV 1873. The new side entered into a union with Viktoria Styrum BV to create SpVgg 1904 Oberhausen-Styrum, but within six months a number of the club's members left to form 1. FC Mülheim-Styrum. The remaining club members carried on and in 1934 took on their current name.