Lev Aleksandrovich Ilyin (Russian: Лев Александрович Ильин; 1880, Tambov Governorate, Russian Empire – 1942) was a Russian architect.
Between 1925-1938 Lev Ilyin was the main architect of Leningrad (now Saint Petersburg), and an author of the overall map of Leningrad and material in the sphere of town-planning.