Grangemouth is a town in the Falkirk council area, Scotland. Historically part of the county of Stirlingshire, the town lies in the Forth Valley, on the banks of the Firth of Forth, 3 miles east of Falkirk, 5 miles west of Bo'ness and 13 miles south-east of Stirling. Grangemouth had a resident population of 17,906 according to the 2001 Census. Preliminary figures from the 2011 census reported the number as 17,373.
Grangemouth's original growth as a town relied mainly on its geographical location. Originally a bustling port, trade flowed through the town with the construction of the Forth and Clyde Canal in the 18th century. Nowadays, the economy of Grangemouth is focused primarily on the large petrochemical industry of the area which includes the oil refinery, owned by Ineos, one of the largest of its kind in Europe. The town is twinned with La Porte, Indiana.
Residents of the town are known as Portonians.