The club was created on September 3, 1949 through the merger of VfR Ohligs , Ohligser FC 06 and VfL Ohligs 12 . The latter was founded on August 21, 1912 as BV Adler Ohligs and was merged with TV 88 Ohligs from 1921 to 1922 to form TBV Ohligs . In 1945 the BV Adler merged with the VfL Ohligs to form VfL Ohligs 12. The most successful predecessor club was the VfR Ohligs, which belonged to the first-class Gauliga Niederrhein in the 1940/41 season . The Ohligser FC rose in 1948 to the then second-class Lower Rhine regional league .
The new club was included in the newly created II. West Division. There the team did not get beyond placements in the lower half of the table. In the 1951/52 season there was a 4-1 victory over Borussia Munich-Gladbach and the best result was achieved with twelfth place. Since the two squadrons of the II. Division were merged into one, Union had to descend.
The 1952/53 season was curious. The Ohligser were declared provisional relay champions and took part in the Lower Rhine Championship, where Union was last. After a few game ratings, the Ohligser slipped back to fourth place. Two years later, the team was runner-up behind Marathon Remscheid , only to miss the newly created Niederrhein Association League in 1956 . The association league promotion in 1963 was followed by direct relegation. In 1965 Union was passed through to the district league.
After the direct resurgence in 1969, he was promoted to the Lower Rhine Upper House. The team reached third place right in the promotion season. In 1973 the Solingen team secured the Lower Rhine Championship with one point ahead of VfB 06/08 Remscheid . In the promotion round to Regionalliga West, the Ohligser under player-coach Horst Stockhausen were only third behind Rot-Weiß Lüdenscheid and SC Viktoria Köln .
But since the regional league clubs Rot-Weiss Essen and Fortuna Köln were promoted to the Bundesliga and only one western club, Rot-Weiß Oberhausen, was relegated to the regional league, Union Ohligs managed to climb. In the regional league season 1973/74 the team reached 15th place. In April 1974 Union Ohligs renamed itself to OSC Solingen after a donation from the city of Solingen and merged on July 24, 1974 with VfL Solingen-Wald to form SG Union Solingen .