Tmolus may refer to:

• Tmolus (son of Ares), mythical Greek king of Lydia and husband to Omphale, known in Greek mythology as a mountain god, son of Ares
• Mount Tmolus, Greek mountain range named for the mythical figure
• Tmolus (father of Tantalus), mythical Greek king of Lydia and father of Tantalus
• Tmolus (butterfly), a genus of butterflies in the family Lycaenidae
• Tmolus (town) or Aureliopolis in Lydia, a city in the Roman province of Lydia situated on Mount Tmolus