- Full name Hermann Paul Müller
- Aka HP Muller
- Birth date November 21, 1909
- Birthplace Bielefeld, Germany
- Date of death December 30, 1975 (66 years 39 days)
- Place of death Ingolstadt, Germany
Like so many of the others who raced for the Silver Arrows, Hermann Muller started off on motorbikes where he was German sidecar champion in 1932 and 500cc champion four years later. In 1937 he was asked to join the Auto Union team as a reserve.
After a few races that year he was invited to become a works driver in 1938 but his season was blighted by a crash in practice ahead of the French Grand Prix. In 1939 he won in France and came second in Germany, and in the four races of a curtailed season he outscored Hermann Lang and was widely believed to have won the European Championship, only for the German authorities to award the title to his rival.
After a war spent in the Luftwaffe - a factory worker rather than anything more active - he returned to motorbike racing, becoming 250cc West German champion in 1947 and in 1955 won the 250cc World Championship with the NSU team at the age of 45. In 1956 he set world records with a NSU record bike at the Bonneville saltflats of Utah.
He worked for Auto Union and at DAF in Holland, finishing in the Auto Union press department in Ingolstadt where he died after a long illness in 1975.
Although he raced under the name Hermann Muller, his entire motorbike career was carried out under the name HP Muller