Grangemouth is a burgh in the region of Falkirk, Scotland, on the Firth of Forth. It is currently known for its large petrochemical plant. Population 18,500.

Grangemouth was founded by Sir Lawrence Dundas in 1777 and was built in conjunction with the eastern extent of the Forth and Clyde Canal. It became prominant due to the canal traffic that passed through. This was helped further by the high tarrifs at the port of Leith.

Twinned with La Porte, Indiana