Perthshire was a Scottish county constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1801 and of the Parliament of the United Kingdom from 1801 until 1885, representing a seat for one Member of Parliament (MP).

The British parliamentary constituency was created in 1708 following the Acts of Union, 1707 and replaced the former Parliament of Scotland shire constituency of Perthshire.

The constituency was created to cover the county of Perth, minus the burgh of Perth, which was a component of the Perth Burghs constituency. The Scottish Reform Act 1832 transferred from Perthshire to Clackmannanshire and Kinross-shire the parishes of Tulliallan, Culross and Muckhart and the Perthshire portions of the parishes of Logie and Fossaway.

The constituency elected one Member of Parliament (MP) by the first past the post system until the seat was abolished in 1885.^{[1] [2] [3] [4] [5]}

As a result of the Redistribution of Seats Act 1885, the Perthshire constituency was divided to create Eastern Perthshire and Western Perthshire in 1885.