Gregor Braun (German pronunciation: [ˈɡʁeːɡoːɐ̯ ˈbʁaʊ̯n] ; born 31 December 1955) is a retired track cyclist and road bicycle racer from Germany, who was a professional rider from 1977 to 1989 and who became a multiple Olympic Gold medaillist and track world champion. his profession was a locksmith.

He represented West Germany at the 1976 Summer Olympics in Montreal, Canada, where he won the gold medal in both the men's individual pursuit and in the team pursuit with Peter Vonhof, Hans Lutz and Günther Schumacher, corroborating their win a year before, also as amateurs, with capturing the gold in the men's team pursuit in the 1975 world championships in Montreal. The West German Olympic track team for 1976 was managed by former track champion Gustav Kilian. In 1977 Braun turned professional, riding mostly on the road and proving himself a capable rider on the road by winning, inter alia, the Giro di Sardegna (1983, 1980), the 14th stage of the 1983 Giro d'Italia, Kuurne–Brussels–Kuurne (1982), the Tre Valli Varesine (1981), Milano–Vignola (1981), the Deutschland Tour (1980), the Tour d'Indre-et-Loire (1979), the then Rund um den Henninger-Turm, three national road championships (1983, 1980, 1978) and ending on the podium in the 1982 Paris–Roubaix, the 1982 Amstel Gold Race and the 1978 Tour of Flanders.

On the track as a professional, Braun became world champion in the (then) 5k pursuit in the 1977 world championships and the 1978 track world championships and won bronze in this discipline in 1985. Furthermore, he won the 1979 European championships madison (with Patrick Sercu). Additionally, Braun started in 44 (mostly German) six-day races, 4 to 6 per season, resulting in 11 wins, with Patrick Sercu (4 wins), René Pijnen (4×), Dietrich Thurau (2×) and Gert Frank (1×) and proving himself very well able to win these races when coupled with a top six-days rider.