Ivan Vasilyov, Bulgarian architect, designed the SS. Cyril and Methodius National Library (b. 1893)
Ivan Vasilyov (Bulgarian: Иван Васильов) was a Bulgarian architect, born in 1893, deceased in 1979.

Together with Dimitar Tsolov, they established one of the most successful Bulgarian architectural studios called Vasilyov-Tsolov. Many of the landmarks of Sofia are their works, most notably SS. Cyril and Methodius National Library (1940-1953), St Nedelya Church, Sofia (1929), Sofia University Library (1932), Bulgarian National Bank headquarters (1939) and The Ministry of Defence headquarters (1939-1945).

In 2010, in their honor, a commemorative plaque was affixed to the National Library.