Richard Southby (1623 – 7 January 1704) was an English politician who sat in the House of Commons in 1659 and from 1679 to 1689.
Southby was the son of John Southby of Carswell Manor in the parish of Buckland in Berkshire (now Oxfordshire) and his wife, Elizabeth daughter and heiress of William Wiseman of Steventon in Berkshire (now Oxfordshire). His father was MP for Berkshire. Southby matriculated at Lincoln College, Oxford on 14 May 1641 aged 17 and entered Gray's Inn on 4 Nov 1646.
- W R Williams Parliamentary History of the County of Gloucester
- Willis, Browne (1750). Notitia Parliamentaria, Part II: A Series or Lists of the Representatives in the several Parliaments held from the Reformation 1541, to the Restoration 1660 ... London. pp. 229–239.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "B" (part 2)