Masjid Al-Nilin, Islamic mosque in Omdurman, Sudan.

Masjid Al-Nilin is a mosque on the western bank of the Nile in Omdurman, Sudan, featuring a tall minaret and a design that brings together modern construction and traditional Islamic forms. The building sits close to the point where the Blue Nile and the White Nile meet.

The mosque's design began as a graduation thesis by Gamer Eldawla Eltahir at the University of Khartoum in the mid-1970s. President Jaafar Nimeiry selected the project for construction, and the mosque was inaugurated on 2 September 1984. It was the first building in Sudan made with aluminium sections and without load-bearing columns, the roof meeting the ground directly like a shell.

The mosque serves as a central gathering place where the local Muslim community comes together for prayer and religious observance. It plays an important role in the spiritual life of Omdurman residents and draws visitors from surrounding neighborhoods.

The mosque is open to visitors during the day, though access for non-Muslims may be limited during prayer times. Modest clothing is expected, and women should cover their hair before entering.

The name Al-Nilin means "the two Niles" in Arabic and refers directly to the location of the building between the two rivers. On a clear day, visitors standing near the mosque can see the point where the two rivers meet and where their waters visibly differ in color.