Xifengite (Fe5Si3) is a rare metallic iron silicide mineral.

It occurs as steel gray inclusions within other meteorite derived nickel iron mineral phases.

It was first described in 1984 and named for the eastern passageway, Xifengkou, of the Great Wall of China.

The type locality is the Yanshan meteorite of the Hebei Province, China.

The other known natural iron silicide minerals are gupeiite (Fe3Si), hapkeite (Fe2Si), linzhiite (FeSi2), luobusaite (Fe0.84Si2), naquite (FeSi), suessite ((Fe,Ni)3Si), and zangboite (TiFeSi2).