Captain David Peter Seely, 4th Baron Mottistone CBE KStJ (16 December 1920 – 24 November 2011) was a naval officer and British peer. Seely was born in 1920. 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 was a grandson of Sir Charles Seely, 1st Baronet. He was baptised with Winston Churchill and the then Duke of Cornwall (subsequently Edward VIII, and then later Duke of Windsor) as his godparents.