1. The Forever War (1974)
2. Forever Peace (1997)
3. Forever Free (1999)
1. Worlds: A Novel of the Near Future (1981)
2. Worlds Apart (1983)
3. Worlds Enough and Time (1992)
1. Marsbound (2008)
2. Starbound (2010)
3. Earthbound (forthcoming)
Mindbridge (1976)
Tool of the Trade (1987)
The Long Habit of Living (1989) (aka Buying Time)
The Hemingway Hoax (1990)
The Coming (2000)
Guardian (2002)
Camouflage (2004)
Old Twentieth (2005)
The Accidental Time Machine (2007)
All My Sins Remembered (1977)
Infinite Dreams (1978)
Dealing in Futures (1985)