Robert King, 1st Baron Kingsborough, known as Sir Robert King, Bt, between 1740 and 1748, was an Irish landowner and politician.
King was the elder son of Sir Henry King, 3rd Baronet, by Isabella Wingfield, daughter of Edward Wingfield and sister of Richard Wingfield, 1st Viscount Powerscourt.
He succeeded his father in the baronetcy in 1740. In 1744 he was returned to the Irish Parliament for Boyle, a seat he held until 1748, when, aged only 24, he was raised to the Irish peerage as Baron Kingsborough. He was also Custos Rotulorum of Roscommon.