EXHIBIT 21 SUBSIDIARIES OF W&T OFFSHORE, INC. The subsidiaries of W&T Offshore, Inc. are listed below. Name State of Organization - ---- --------------------- Offshore Energy I LLC Delaware Offshore Energy II LLC Delaware Offshore Energy III LLC Delaware Gulf of Mexico Oil and Gas Properties LLC Delaware W&T Holdings, L.L.C.* Louisiana * W&T Offshore, Inc. has commenced the process of dissolving this subsidiary.