Commissioners of Supply were local administrative bodies in Scotland from 1667 to 1930. Originally established in each sheriffdom to collect tax, they later took on much of the responsibility for the local government of the counties of Scotland. In 1890 they ceded most of their duties to the county councils created by the Local Government (Scotland) Act 1889. They were finally abolished in 1930.
The Parliament of Scotland passed legislation creating Commissioners of Supply for each of the shires or sheriffdoms in 1667. The act specified that the commissioners for each sheriffdom should consist partly of ex officio members: all privy councillors and senators of the College of Justice "within the severall respective shyres wher any part of ther lands and estates doeth ly", and partly of nominated members: a number of named prominent landowners in each shire. The commissioners had the duty of ensuring the collection of "cess" or land tax to supply the financial needs of the sovereign. A total of 72,000 pounds was to be raised monthly throughout Scotland, with each sheriffdom responsible for a set sum. This ranged from 33,183 pounds and 8 shillings in Midlothian to 352 pounds, 7 shillings and 3 pence in Clackmannanshire. The royal burghs lying within each sheriffdom were not subject to the commissioners, the cess being collected by the burgh magistrates.
In 1686 the commissioners took on their first local government functions. In that year an act was passed providing that the repair of highways and bridges should be the responsibility of "the several shires and burghs... within their respective bounds". The sheriff of each shire was given the power to compel the commissioners of supply and justices of the peace to convene and agree funding and allocation of labour for road repairs.
The commissioners continued to exist following the passing of the Act of Union in 1707. From 1718 they became responsible, along with justices of the peace, for county roads and bridges, and in 1832 they were charged with raising "rogue money" for the keeping of the peace.