Sergei Ulagay (October 31, 1876 – April 29, 1944) was a White Army general in the Russian Civil War of 1917–1922.

He was a recipient (1917) of the Order of St. George.

General Ulagay allegedly took part in Ahmet Zogu's coup in Albania in December 1924.

[1] He died in Marseille, France.

He is buried at Sainte-Geneviève-des-Bois Russian Cemetery south of Paris.