The Church of the Blessed Virgin Mary's Immaculate Conception (Azerbaijani: Müqəddəs Bakirə Məryəmin kosteli; Polish: Kościół Niepokalanego Poczęcia Najświętszej Maryi Panny, Russian: Храм Непорочного Зачатия Пресвятой Девы Марии) was a Roman Catholic church built in 1912 by Polish architect Józef Płoszko in Baku, Imperial Russia (modern Azerbaijan).

The allocated plot was later transferred to the Orthodox community, where they built Alexander Nevsky Cathedral of Baku in 1898.

Its pastor, Stepan Demurov, was arrested on the night of 13–14 November 1937 on suspicion of espionage in Baku and was sentenced to death on 11 February 1938.

The Baku Church of the Blessed Virgin Mary was built in the pseudo-Polish Gothic revival style.

It was distinguished from French and English Gothic by the absence of special splendor and richness of decorative forms.

The silhouette of the church with faceted, open-type towers, according to architecture historian Shamil Fatullayev, was well-defined.

The facade was complemented by a portal and a rose window, which, as Fatullayev notes, was "appropriately included in the overall composition.