Captain David Peter Seely, 4th Baron Mottistone CBE KStJ (16 December 1920 – 24 November 2011) was a naval officer and British peer.
He was the eldest son of the 1st Baron Mottistone from his second marriage to Evelyn Izme Murray daughter of Montolieu Oliphant-Murray, 1st Viscount Elibank and 10th Lord Elibank, and half-brother to Henry John Alexander Seely, 2nd Baron Mottistone and Arthur Patrick William Seely, 3rd Baron Mottistone.
He served in the Royal Navy, ultimately reaching the rank of captain.
He was created a Commander of the Order of the British Empire in 1984 and made an Honorary Doctor of Literature by Bournemouth University in 1993.
He was succeeded by his eldest son Peter John Philip Seely, born 29 October 1949, who was a godson of Prince Philip, Duke of Edinburgh.