Richard Milles (c. 1735 – 14 September 1820) was an English landowner, horticulturalist and Tory politician who sat in the House of Commons from 1761 to 1780.
Milles was the son of Christopher Milles of Nackington, and his wife Mary Warner, daughter of Richard Warner of North Elmham Norfolk. He was educated at Westminster School and at St John's College, Cambridge. He entered Lincoln's Inn in 1753. He was a country gentleman with large estates. Before 1761, he went on the Grand Tour of Europe.
He was noted as a botanist and planted an orchard at his garden at North Elmham.
Milles was elected Member of Parliament (MP) for Canterbury in 1761 and won that and two subsequent election by a comforatble majority, holding the seat to 1780, when he did not stand.
Milles married on 9 October 1765, Mary Elizabeth Tanner, daughter of the Rev. Thomas Tanner, DD, Prebendary of Canterbury. Together, they had their only daughter in 1767
Her portrait was painted by both Joshua Reynolds and Thomas Gainsborough.