Gandalara (with Vicki Ann Heydron)

• The Steel of Raithskar (1981)
  
• The Glass of Dyskornis (1982)
  
• The Bronze of Eddarta (1983)
  
• 4. The Well of Darkness (1983)
  
• The Search for Ka (1984)
  
• Return to Eddarta (1985)
  
• The River Wall (1986)
  
  Lord Darcy

• Too Many Magicians (1966)
  
• Murder and Magic (1979)
  
• Lord Darcy Investigates (1981)
  

• The Shrouded Planet (1957) (writing as Robert Randall)
  
• The Dawning Light (1959) (writing as Robert Randall) (with Robert Silverberg)
  
• Pagan Passions (1959)
  
• That Sweet Little Old Lady (1959) (writing as Mark Phillips)
  aka Brain Twister
  
• The Impossibles (1963) (writing as Mark Phillips)
  
• Supermind (1963) (writing as Mark Phillips)
  
• Takeoff (1980)
  
• Earth Invader (1982)
  
• Takeoff, Too (Starblaze Editions) (1987)
  
• Starship Death
  
• The Gandalara Cycle I
  

• Best of Randall Garrett
  
• The Gandalara Cycle (with Vicki Ann Heydron)