Jules Henri Emmanuel Boileau, baron de Castelnau was a French alpinist and sportsman who took part in the first ascent of the Meije. After his career as an alpinist he competed as an amateur cyclist.
- Occupation
- sport cyclist, racing automobile driver, mountaineer, athletics competitor
- Citizenship
- France
- Born
- July 1, 1857
- Died
- March 23, 1923
