Runoff, run-off or RUNOFF may refer to:
- Runoff (hydrology), the flow of water over land
- Channel runoff, the confined flow of water
- Surface runoff, the unconfined flow of water over land
- Runoff model (reservoir), a mathematical model involving rainfall and runoff
- Runoff curve number, an empirical parameter used in hydrology
- RUNOFF, the first computer text-formatting program
- Runoff or run-off, another name for bleed, printing that lies beyond the edges to which a printed sheet is trimmed
- Runoff or run-off, a stock market term
- Runoff voting system, also known as the two-round system, a voting system where a second round of voting is used to elect one of the two candidates receiving the most votes in the first round
- Instant-runoff voting, an extension or variation of runoff voting where a second round can be rendered unnecessary by voters ranking candidates in order of preference
- Run-off area, a racetrack safety feature
- Runoff (2014 film) directed by Kimberly Levin