Nikolai Viitak (14 November 1896 – 24 April 1942) was an Estonian politician and military figure.
He studied at St. Petersburg University and Riga Polytechnic Institute, participating as an officer in World War I and the Estonian War of Independence with the rank of captain (communication chief of the 1st Division).
In 1925, he graduated from Technische Universität Darmstadt, then worked as a civil engineer after returning home to Estonia.
His wife Helene was the daughter of Anton Teetsov, who was the Minister of Finance in Jaan Tõnisson's third cabinet.
[1] Following the Soviet occupation of Estonia in 1941, Viitak was arrested by the NKVD in 1941, and was sentenced to death and executed at the Sevurallag Sosva Prison Camp, in Sverdlovsk Oblast.