Undivided co-ownership is a legal situation in which several people hold rights of the same kind, in equal or unequal shares, in the same property, without the share of each of these co-owners being physically identifiable.

Undivided co-ownership between several co-owners arises, for example, if a single property is purchased by several people. The distribution of ownership rights, i.e. the share that each person holds in the property, is based on their financial contribution. The co-owners must take the most important decisions unanimously.

A situation of undivided co-ownership between several co-owners may also arise through the opening of a succession whereby several heirs become co-owners of a property before the final division of the estate.