The 1969–70 Regionalliga was the seventh season of the Regionalliga, the second tier of the German football league system. The league operated in five regional divisions, Berlin, North, South, Southwest and West. The five league champions and all five runners-up, at the end of the season, entered a promotion play-off to determine the two clubs to move up to the Bundesliga for the next season. The two promotion spots went to the Regionalliga Süd champions Kickers Offenbach and Regionalliga West runners-up Arminia Bielefeld.
The 1969–70 season saw two new clubs in the league, Olympia Wilhelmshaven and SC Leu Braunschweig, both promoted from the Amateurliga, while no club had been relegated from the Bundesliga to the league.
The 1969–70 season saw two new clubs in the league, TuS Wannsee and Sportfreunde Neukölln, both promoted from the Amateurliga, while no club had been relegated from the Bundesliga to the league. For the following season the Regionalliga Berlin was reduced from 14 to 12 clubs.
The 1969–70 season saw three new clubs in the league, DJK Gütersloh, SSVg Velbert and SpVgg Erkenschwick, all promoted from the Amateurliga, while no club had been relegated from the Bundesliga to the league.
The 1969–70 season saw two new clubs in the league, ASV Landau and SC Friedrichsthal, both promoted from the Amateurliga, while no club had been relegated from the Bundesliga to the league.
The 1969–70 season saw four new clubs in the league, FSV Frankfurt and VfR Heilbronn, both promoted from the Amateurliga, while Kickers Offenbach and 1. FC Nürnberg had been relegated from the Bundesliga to the league.