General Robert Edward King, 1st Viscount Lorton (12 August 1773 – 20 November 1854), styled The Honourable from 1797 to 1800, was an Anglo-Irish peer and politician.

Born in London at his parents' town house, he was the third child and second son of Robert King, 2nd Earl of Kingston by his wife, the heiress Caroline Fitzgerald.

After a period of service in the army beginning 1792, Robert King achieved some notoriety when he was tried in April 1798 at the Cork Assizes for the murder of his illegitimate cousin (or maternal half-uncle) Colonel Henry Gerald FitzGerald, for seducing his sister.

[6] This scandal did not affect Robert King's career; he represented Jamestown in the Irish House of Commons from 1796 to 1798, and was subsequently a Member of Parliament for Boyle until the Act of Union in 1801.

Although successful in his chosen career, he appears to have made little mark in military history, compared to other Anglo-Irish noblemen such as Arthur Wellesley, 1st Duke of Wellington or Eyre Coote, or the earlier Lord Cornwallis.

His daughter, Frances, married Rt Hon Sir Thomas Stafford, 1st Baronet, a physician and member of the Irish Privy Council.