Robert Ridgeway, 4th Earl of Londonderry (died 7 March 1714) was an Anglo-Irish peer.
His father was the grandson of he former Cicely MacWilliam and Thomas Ridgeway, 1st Earl of Londonderry.
His maternal grandparents were Sir Peter Temple, 2nd Baronet, MP for Buckingham, and the former Christiana Leveson.
Together, they were the parents of:[3] Lord Londonderry of Tor Mohun in Devon died on 7 March 1714.
[5] His daughter, Lady Frances, inherited the estate of Cudworth in Yorkshire and, in 1726, his son-in-law Thomas Pitt was created Earl of Londonderry in the title's second creation.