Lethendy is a small parish, which lies in Perth and Kinross Council Area, some 3 miles (4 km) southwest of Blairgowrie and 12 miles (19 km) north of Perth in Perth and Kinross.
It is located in the old county of Perthshire, which disappeared following the Local Government (Scotland) Act 1974.
The parish has an area of 7 sq. km (2.7 sq. miles). Lethendy has 4 neighbouring parishes; namely Blairgowrie, Caputh, Clunie and Kinloch.