Thomas Innes Pitt, 1st Earl of Londonderry (c. 1688 – 12 September 1729) was a British Army officer, speculator[1] and Whig politician who sat in the House of Commons from 1713 to 1728.

[2] In the 1713 general election Pitt was returned as a Whig Member of Parliament for Wilton, in Wiltshire, a rotten borough owned by his father.

Seven years later the earldom was also revived when he was created Viscount Gallen-Ridgeway and Earl of Londonderry, again in the Peerage of Ireland.

[6] Lady Frances inherited the estate of Cudworth in Yorkshire, and in December 1732, having survived her first husband Thomas Pitt, remarried to Robert Graham, of South Warnborough, Hampshire.

By his wife, Pitt had two sons and one daughter:[7] He died on 12 September 1729, aged 41, at St. Kitts, Leeward Islands, after a year's service as Governor, and was buried in the family vault at Blandford, Dorset.