Timbuk may refer to:

• Timbuk Tu; see Timbuktu, a town in Mali in West Africa
• Timbuk 3; see Timbuk3, American post-punk band
  • Greetings from Timbuk 3, a 1986 Timbuk3 album
• Timbuk: The Last Runaway Slave; see List of In Living Color sketches

• Lieutenant john kavanaugh
• Lieutenant John William Finn
• Lieutenant Junior Grade (Star Trek)
• Lieutenant junior grade (Star Trek)
• Lieutenant Jérôme Collet
• Lieutenant Karl "Helo" Agathon
• Lieutenant Kije
• Lieutenant Kije (Prokofiev)
• Lieutenant La Forge
• Lieutenant Leslie
• Lieutenant Marimow
• Lieutenant Martin Castillo
• Lieutenant Mary Sue
• Lieutenant Max Gain
• Lieutenant M'Ress
• Lieutenant Murnau
• Lieutenant Nately
• Lieutenant Nog
• Lieutenant of the Admiralty
• Lieutenant Omar Bradley
• Lieutenant Philip J. Corso
• Lieutenant Phineas T. Pinkham
• Lieutenant Pigeon
• Lieutenant Pinkham
• Lieutenant Randall "Randy" Disher