109

109 may refer to:

• 109 (number), the natural number following 108 and preceding 110
• AD 109, a year of the Julian calendar, in the second century AD
• 109 BC, a year of the pre-Julian Roman calendar
• 109 (department store), a department store in Shibuya, Tokyo, Japan
• Route 109 (MBTA), a bus route in Massachusetts, US
• Messerschmitt Bf 109, a German World War II fighter plane
• M109 howitzer, an American self-propelled howitzer
• 109 Felicitas, a main-belt asteroid

See also

• 10/9 (disambiguation)
• Meitnerium, synthetic chemical element with atomic number 109