The Märcani Mosque (pronounced [mærʑæˈni]; Tatar: (әл-)Мәрҗани мәчете; formerly Äfände, i.e. Seigniorial, The First Cathedral Mosque, The Yunısovs' Mosque), also spelled al-Marjani, Mardjani and Mardzhani (Russian: Мечеть (аль-)Марджани́) is a mosque in Kazan, Russia, built in 1766-1770 by Catherine the Great's authority and on the city's population's donations.

The mosque was built in traditions of the Tatar medieval architecture combined with provincial baroque style, and it represents a typical Tatar mosque.

In 1887 merchants W. Ğizzätullin and M. Wälişin added the tracery balcony to the minaret.

The mosque is currently named after Tatar scholar Şihabetdin Märcani who worked there as imam in the mid 19th century.

This article about a mosque building or other Islamic place of worship in Russia is a stub.