Abstract: A modular cattle stall structure which is set into or affixed to the floor of a barn or similar building to define spaces for the cattle and provide separation between them. The modules are arranged in a linear array so that one module is between the space for two cattle and each module defines one boundary for the cattle on each side of it. Half modules are provided for the end stall and the unitary structure has no crevices or places to retain dirt so that maintenance of a sanitary condition is simplified.