Sir Thomas Lee, 3rd Baronet (1687–1749), of Hartwell, near Aylesbury, Buckinghamshire, was an English politician who sat in the House of Commons almost continuously from 1710 to 1741. Lee was the eldest son of Sir Thomas Lee, 2nd Baronet, MP and the brother of George, John and William. He succeeded his father in 1702, inheriting the family seat at Hartwell, near Aylesbury, Buckinghamshire. Lee married in 1720, Elizabeth Sandys, the daughter and heiress of Thomas Sandys of London and had two sons and a daughter. He was succeeded by his second son William.