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