Helmut Dähne (also rendered as Daehne or Dahne, born 29 November 1944 in Altenmark, Germany) is a German former motorcycle racer, active not in Grand Prix races, for which the rather tall Dähne (190 cm) is not well suited, but in endurance racing with production machines, comparable to touring cars and rallying with automobiles.
From the 1970s to the 1990s, he was active on the longest circuits of motorcycle racing, the over 20 km long Nürburgring Nordschleife, and the over 60 km long Snaefell Mountain Course of the Isle of Man TT.