Oswald Constantine John Phipps, 4th Marquess of Normanby (29 July 1912 – 30 January 1994), styled Earl of Mulgrave until 1932, was a British peer and philanthropist for blind people.

The only son of Constantine Phipps, 3rd Marquess of Normanby and his wife Gertrude Stansfeld Foster, he was educated at Lambrook preparatory school,[1] Eton College and Christ Church, Oxford.

He briefly served in the same post for the Lord President of the Council, Frederick Marquis, 1st Earl of Woolton, in 1945.

As well as being a member of St Dunstan's council, he was also chairman of the National Library for the Blind from 1946 until his death and its president from 1977 to 1988.

Lady Normanby set up the Captain Cook Memorial Museum in Whitby and served as a magistrate on the local bench.