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 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
- Mary Elizabeth Milles (1767–1818), later Lady Sondes married Hon. Lewis Thomas Watson, son of Lewis Watson, 1st Baron Sondes in 1785. Hon. Lewis Thomas Watson was descended collaterally from the Earls of Rockingham, and his mother had been a granddaughter of John Manners, 2nd Duke of Rutland, and a daughter of Henry Pelham, a former prime minister. The first of the couple's four sons was born in 1792, and in 1795, Lewis Watson succeeded his father as second Baron Sondes of Lees Court and of Rockingham Castle, Northamptonshire. He died in 1806. Three years later, Lady Sondes married Brigadier General Sir Henry Tucker Montresor. She died in Kent in 1818.
- Portrait of Richard Milles, National Gallery
- J. Brooke, Lewis Namier The House of Commons 1754–1790, Volume 3
- "Milles, Richard (FML753R)". A Cambridge Alumni Database. University of Cambridge.
- Journal of the Royal Horticultural Society 1937, p501–07
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "C" (part 2)
- Metropolitan Museum of Art Hon Mrs Lewis Thomas Watson
- Christies – Gainsborough Portrait of the Hon Mrs Watson
|Parliament of Great Britain|
|Member of Parliament for Canterbury
With: Thomas Best 1761–1768
William Lynch 1768–1774
Sir William Mayne, Bt 1774–1780