Sir Isaac Thornton (27 February 1615 – 1 May 1669) was an English lawyer and politician who sat in the House of Commons in 1660.
Thornton was the son of Sir Roger Thornton of Soane, Cambridgeshire. He matriculated from Corpus Christi, Cambridge at Easter 1631. He was admitted at Lincoln's Inn on 20 June 1632 and was called to the Bar in 1640.
- "Thornton, Isaac (THNN631I)". A Cambridge Alumni Database. University of Cambridge.
- History of Parliament Online - Thornton, Isaac
- Knights of England
- A History of the County of Cambridge and the Isle of Ely. 10. 2002. pp. 475–479.