Mold or mould (see spelling differences) is used most to refer to certain organisms:

Mold or mould, a kind of fungus

Molding (decorative)

Mold, Flintshire, a town in Wales

Slime moulds, kinds of protist

Water mould, kinds of protist

Leaf mold or mould, composted soil or earth, particularly loose soil suitable for planting

mold or mould, a kind of a framework or shape used to make an object of complementary shape from a pliable or liquid raw material

Arthur Mold, a fast bowler for Lancashire in the 1890s

Mold is an album made by the supergroup Praxis in 1998

Bob Mould, a musician with alternative rock bands Hüsker Dü and Sugar, considered a godfather to the grunge movement of the 1990s