Henry Loftus, 1st Earl of Ely KP, PC (Ire) (18 November 1709 – 8 May 1783), styled The Honourable from 1751 to 1769 and known as Henry Loftus, 4th Viscount Loftus from 1769 to 1771, was an Anglo-Irish peer and politician.
He was the younger son of Nicholas Loftus, 1st Viscount Loftus and Anne Ponsonby, daughter of William Ponsonby, 1st Viscount Duncannon. His elder brother was Nicholas Hume-Loftus, 1st Earl of Ely of the first creation.
He served as High Sheriff of Wexford in 1744 and between 1747 and 1768 represented Bannow in the Irish House of Commons. Subsequently Loftus sat for Wexford County until 1769, when he succeeded his nephew Nicholas Hume-Loftus, 2nd Earl of Ely, as Viscount Loftus. Loftus was created Earl of Ely (second creaton) in 1771 and was appointed a Knight Founder of the Order of St Patrick on 11 March 1783.
He married firstly in 1745 Frances Monroe, daughter of Henry Monroe of Roe's Hall, County Down. She was a leader of Dublin society who wielded some political influence, and was considered to be a much stronger character than her rather ineffectual husband, whom she dominated completely. She died in 1774.
There is a portrait of the couple, with Lady Ely's nieces, Dorothea (Dolly) and Frances Monroe, the daughters of her brother Henry, by the celebrated Swiss painter Angelica Kauffman, who visited Ireland in 1771. Dolly Monroe was considered to be one of the greatest beauties of the age, whose admirers included Henry Grattan and Oliver Goldsmith. She married the politician William Richardson, and died in 1793 sister Frances married Henry Read.