18th Brigade may refer to:
- 18th Infantry Brigade (United Kingdom)
- 18th Mounted Brigade (United Kingdom)
- Artillery Brigades
- 18th Aviation Brigade (United States)
- 18th Engineer Brigade (United States)
- 18th Fires Brigade (United States)
- 18th Military Police Brigade (United States)
- 18th (Croatian) Eastern Bosnian Brigade, an irregular formation of Yugoslav partisans which opposed German forces during World War II
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