Russell Donnithorne Walker (1842–1922) was an English cricketer, barrister, and cricket administrator. Born in Southgate, Middlesex, he was one of seven cricket-playing brothers who were influential in establishing the Middlesex County Cricket Club in 1864. The family's cricket ground at Southgate is still maintained by the Walker Trust.

Walker had a notable cricket career, playing as a right-handed batsman and a round arm slow right arm bowler.