Gabriel Syveton (21 February 1864 – 8 December 1904) was a French historian and politician.
He was one of the founding members of the patriotic and anti-Dreyfus Ligue de la patrie française.
He was elected as deputy for the Seine in 1902.
He was involved in scandal when he exposed the existence of a card file compiled from Freemason reports on public officials.
It listed practicing Catholics, who should be passed over for promotion.
He died, apparently from suicide, the day before being required to appear in court after physically attacking the Minister of War in the Chamber of Deputies.