Thomas Fanshawe, 2nd Viscount Fanshawe (1632–1674) of Ware Park, Hertfordshire was an Irish peer and Member of Parliament. He was born to Thomas Fanshawe, 1st Viscount Fanshawe by his second wife Elizabeth Cockayne, the daughter of Sir William Cockayne, who served as the Lord Mayor of London in 1619.

Thomas Fanshawe, 1st Viscount Fanshawe KB was an English politician who sat in the House of Commons at various times between 1621 and 1661. He supported the Royalist cause in the English Civil War. Following the Restoration he was raised to the peerage.