James Modyford Heywood (c1729 – 22 March 1798) was an English Member of Parliament for Fowey, plantation owner in Jamaica, and Lord of the Admiralty.

After a contest, Heywood was returned for Fowey on the Edgcumbe interest in 1768, although no vote by him is recorded before February 1774.

In 1770 Thomas Davenport wrote to the Duke of Portland, that "Heywood would have Administration support at the next election."

[7] Together, Catherine and James were the parents of one son and five daughters,[1] including: Heywood died on 22 March 1798 and was buried at St Botolph's, Shenleybury, Shenley.

[5] Accordingly, Maristow House was sold to Manasseh Masseh Lopes (the son of a rich plantation owner, whose family later gained the title of Baron Roborough),[17] reputedly for £100,000.