E1M1: Hangar -- by John Romero
E1M2: Nuclear Plant -- by John Romero
E1M3: Toxin Refinery -- by John Romero
E1M4: Command Control -- by John Romero and Tom Hall
E1M5: Phobos Lab -- by John Romero
E1M6: Central Processing -- by John Romero
E1M7: Computer Station -- by John Romero
E1M8: Phobos Anomaly -- by Sandy Petersen and Tom Hall
E1M9: Military Base (Secret level) -- by John Romero
E1M10: Sewers (Secret level; Xbox only) -- by John Romero
E2M1: Deimos Anomaly -- by Sandy Petersen and Tom Hall
E2M2: Containment Area -- by Sandy Petersen and Tom Hall
E2M3: Refinery -- by Sandy Petersen and Tom Hall
E2M4: Deimos Lab -- by Sandy Petersen and Tom Hall
E2M5: Command Center -- by Sandy Petersen
E2M6: Halls of the Damned -- by Sandy Petersen
E2M7: Spawning Vats -- by Sandy Petersen and Tom Hall
E2M8: Tower of Babel -- by Sandy Petersen
E2M9: Fortress of Mystery (Secret level) -- by Sandy Petersen
(many of E2 levels were first started by Tom Hall and finished by S. Petersen)
E3M1: Hell Keep -- by Sandy Petersen
E3M2: Slough of Despair -- by Sandy Petersen
E3M3: Pandemonium -- by Sandy Petersen and Tom Hall
E3M4: House of Pain -- by Sandy Petersen
E3M5: Unholy Cathedral -- by Sandy Petersen
E3M6: Mt. Erebus -- by Sandy Petersen
E3M7: Limbo -- by Sandy Petersen and Tom Hall
E3M8: Dis -- by Sandy Petersen
E3M9: Warrens (Secret level) -- by Sandy Petersen
(two of E3 levels were started by Tom Hall and finished by S. Petersen)
Ultimate Doom:
E4M1: Hell Beneath -- American McGee
E4M2: Perfect Hatred -- John Romero
E4M3: Sever The Wicked -- Shawn Green
E4M4: Unruly Evil -- American McGee
E4M5: They Will Repent -- Tim Willits and Theresa Chasar
E4M6: Against Thee Wickedly -- John Romero
E4M7: And Hell Followed -- John Anderson
E4M8: Unto The Cruel -- Shawn Green
E4M9: Fear -- Tim Willits