Airth is a coastal parish, which lies in Falkirk Council Area, some 3 miles (6 km) south of Alloa in Clackmannanshire and 5 miles (8 km) north of Falkirk in Falkirk.
It is located in the old county of Stirlingshire, which disappeared following the Local Government (Scotland) Act 1974.
The parish has an area of 22.4 sq. km (8.6 sq. miles). Airth has Grangemouth, Larbert and St Ninians as its neighbouring parishes.