Émile Joseph Demangel (20 June 1882 – 11 October 1968) was a French amateur track cyclist who competed in several sprint events at the 1906 Intercalated Games and 1908 Summer Olympics.
In 1906 he finished fourth in the 5,000 m and 333? m time trial events.
At the 1908 Games he served as the flag bearer for the French delegation, won a silver medal in the 660 yards sprint, and placed fifth in the 1,980 yards team pursuit.
The same year he set a world record in the paced 500 metre time trial and won a bronze medal in the sprint at the world championships.
A street in Xertigny, where he died in 1968, is named for him.