A multi-tool (or multitool) is any one of a range of portable, versatile hand tools that combines several individual functions in a single unit.

The smallest are credit-card or key sized units designed for carrying in a wallet or on a keyring, but others are designed to be carried in a trouser pocket or belt-mounted pouch.

The idea of incorporating several tools in one small portable unit is very old, dating back at least as far as Middle Roman times. Many of these were based around eating.