Oiler may refer to:
- Replenishment oiler, a type of nautical ship
- Slang for diesel engine
- Oiler (occupation), an occupation
- Any person who works in the oilpatch from a derrickhand to a toolpush
- The Oiler, an unnamed character in The Open Boat by Stephen Crane
- Oiler (Transformers), a fictional Transformers character
- Oil can
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