Martingale can refer to:
- Martingale (probability theory), a stochastic process in which the conditional expectation of the next value, given the current and preceding values, is the current value
- Martingale (tack) for horses
- Martingale (collar) for dogs and other animals
- Martingale (betting system)
- Martingale (rigging)
- In the sport of fencing, a martingale is a strap attached to the sword handle to prevent a sword from being dropped if disarmed.
- In the theatrical lighting industry, martingale is an obsolete term for a twofer, or occasionally a threefer.