James Jardine FRSE FSAScot (1776–1858) was a Scottish civil engineer, mathematician and geologist. He was the first person to determine mean sea level.
He was born in Applegarth, Dumfriesshire, on 30 November 1776, the son of a farmer. He was educated at Dumfries Academy and Edinburgh University.
He built tunnels and bridges, including for the Innocent Railway, and built reservoirs including Glencorse, Threipmuir, Harlaw for Edinburgh, and Cobbinshaw for the Union Canal.
- Gazetteer for Scotland: James Jardine