Arbor or arbour may refer to:
- Arbor (garden), a landscape structure
- Arbor (tool) or mandrel
- Arbor, California
- Arbor, a counterweight-carrying device found in theater fly systems
- Arbor, the central post of a fishing reel to which fishing line is attached
- Arbor knot, a knot commonly used to attach fishing line to a fishing reel
- Arbor Drugs, a defunct Detroit, Michigan-based drug store chain