Félix Lucien Roger Debax (28 September 1864 – 25 August 1914) was a French army officer and Olympic fencer. Born in Toulouse, Debax entered the army as an officer-candidate at the age of 18. After service with the infantry (where he was promoted to the rank of captain), he became attached to the army gymnastics school in 1889. He was transferred back to the infantry for two years from 1893, before returning to the ecole. Debax remained a gymnastics teacher until 1901 during which time he competed as a fencer at the 1900 Summer Olympics in Paris.