Franz Albert Seyn (Russian: Франц Альберт Александрович Зейн, Frants Albert Alexandrovich Zeyn; 27 July 1862 – summer 1918) was a Russian general who was Governor-General of Finland between 24 November 1909 and 16 March 1917.
Before he became Governor-General, Seyn had been a staff officer in the military district of Finland and an aide to the Governor-General. Seyn contributed to the Russification of Finland as he followed in the footsteps of his assassinated (1904) predecessor, Governor-General Nikolai Ivanovich Bobrikov. Finnish autonomy was further limited and in laws passed in 1908 and 1910 the Russian Duma, instead of the Finnish Diet, was given rights to make laws concerning the Grand Duchy of Finland.
After the February Revolution, the Russian Provisional Government arrested Seyn on 16 March 1917 and brought him to Petrograd where he apparently was killed the next year.