Reimund Dietzen sometimes written Raimund Dietzen (born 29 May 1959 in Trier, Rhineland-Palatinate) is a retired road and cyclo-cross cyclist from Germany, who was a professional rider from 1982 to 1990.
Dietzen was a successful amateur winning the German cyclo-cross championship in 1980 and 1981 as well as winning in road races.
He turned professional with the Swiss team Puch in 1982.
He won the cyclo-cross race the Grand Prix Jean Bausch-Pierre Kellner that year.
The following year he joined a Spanish cycling team Teka with whom he would stay with for the rest of his career.
In his first year with his new team he won the Volta a la Comunitat Valenciana.
The following year he became the champion of Germany in the road race and cyclo-cross as well his first stage victory in the Vuelta a EspaƱa.
He won the stage to the Lagos de Covadonga which is a very steep climb and a prestigious stage to win.
He would finish that year's edition of the Vuelta third overall.
The following year he was again cyclo-cross champion as well as the winner of the Vuelta a Cantabria.
In 1986 he was again German road champion and won a second stage in the 1986 Vuelta a EspaƱa.
In 1987 he wore the leader's jersey in the 1987 Vuelta a EspaƱa for five days before losing it to Herrera and then finishing the race second overall to Luis Herrera of Colombia.
Dietzen finished the 1988 Vuelta a EspaƱa second overall, this time to Sean Kelly of Ireland.
In the 1989 Vuelta a EspaƱa, Dietzen won a stage but several days later he crashed.
He had ridden into a tunnel which was not illuminated and crashed, suffering career-ending injuries.
He was only 30 years of age when the following year he stopped as a professional after not recovering.
Seventeen years later, the Supreme Court of Spain ordered the organisers of the Vuelta a EspaƱa to pay damages to Dietzen.
Dietzen obtained nearly all of his success in Spanish races with wins in Vuelta a La Rioja, Vuelta a Castilla y LeĆ³n and the Setmana Catalana de Ciclisme.
From 2003, Dietzen was a directeur sportif with the now-defunct Team Gerolsteiner.