Abstract: A modular support for an oversized queen mattress includes a pair of modules each having a box spring unit with the box spring units sized to have a width equal to one-half that of a conventional unitary queen mattress and a length equal to that of the conventional queen mattress. Each module also has a platform fixed to its top surface. The platforms are sized to collectively support, when in abutting relation, an oversized queen mattress placed atop the abutting modules. The box spring units, when butted together along their respective confronting inside longitudinal edges and positioned within the rectangular opening of a conventional queen size bed frame, support the oversized queen mattress in a conventional size queen bed frame.