Moss-troopers were bandits who operated in Scotland during and after the period of the English Commonwealth in the mid-17th century.
Many moss-troopers were disbanded or deserting soldiers from one of the Scottish armies of the Wars of the Three Kingdoms. They had kept their weapons and lived a life of banditry, attacking both civilians and Parliamentary soldiers for supplies during the Royalist rising of 1651 to 1654 when English Parliamentarian troops under George Monck occupied Scotland. Moss-troopers usually operated in small bands, either on the fringes of the Highlands or in the border regions. Many Highland lairds complained of moss-troopers' cattle-stealing and of how they incurred military reprisals against the Highlands as a whole.
Some moss-troopers may have had a national-political as well as an economic motivation, believing that they were resisting the Cromwellian occupation of Scotland - much as their Irish contemporaries, the "tories", in part resisted English occupation.