Richard Rigby PC (February 1722 – 8 April 1788), was an English civil servant and politician who sat in the British House of Commons for 43 years from 1745 to 1788.

Richard Rigby's father also had the same name, and was significant in the history of Jamaica, serving as its secretary, the provost marshal, and a member of the Royal Assembly in the late 17th and early 18th century.

In December 1755 he became a junior minister as one of the Lords of Trade and in 1757, he retained a seat in the Irish House of Commons for Old Leighlin, which he held until 1761.

In 1762 Rigby was seriously considered for promotion to Secretary at War, but he preferred to remain in lucrative sinecures rather than to accept more substantive office, and instead was made in 1765 joint Vice-Treasurer of Ireland.

Rigby spent much of his fortune reinvesting in the family seats of Mistley and Manningtree, employing the top architects and landscape artists of the day to build a port and a spa.