SD18, SD-18 or SD 18 may refer to:
- SD18 (ship type) - a type of cargo ship
- British NVC community SD18 - one of the 16 sand-dune communities in the British National Vegetation Classification system
- Former state highways in South Dakota#Highway 18
- EMD SD18 - an American-built diesel locomotive
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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