Abstract: A modular columbarium for storing funerary urns, comprising a plurality of individual containers able to be coupled together in a matrix arrangement, preferably in rows and columns. Said individual containers are each made up of a part made from injection-mouldable plastic material defined by a base and side walls, such that it defines an inner space provided to house at least one funerary urn, wherein each container includes removable closing means provided to close off the inner space from the outside, wherein the closing means include at least one inner door which isolates the inner space from the outside environment, the inner door having releasable locking means and a male-female coupling system for the joining thereof to the individual container.