Ruga may refer to:

• Ruga (anatomy), an anatomical fold
• Ruga, Nepal
• Ruga language, an extinct Sino-Tibetan language that was spoken in Meghalaya, India
• Ruga-Ruga, irregular troops in Eastern Africa, often deployed by western colonial forces
• Rugila, 5th-century Hunnic ruler
• Spurius Carvilius Ruga, 3rd-century Roman grammarian who invented the letter g