Sir Peter Markham Scott (14 September 1909 – 29 August 1989) was a British ornithologist, conservationist, painter, naval officer, broadcaster and sportsman. The only child of Antarctic explorer Robert Falcon Scott, he took an interest in observing and shooting wildfowl at a young age and later took to their breeding.

He established the Wildfowl & Wetlands Trust in Slimbridge in 1946 and helped found the World Wide Fund for Nature, the logo of which he designed. He was a yachting enthusiast from an early age and took up gliding in mid-life. He was part of the UK team for the 1936 Summer Olympics and won a bronze medal in sailing a one-man dinghy. He was knighted in 1973 for his work in conservation of wild animals and was also a recipient of the WWF Gold Medal and the J. Paul Getty Wildlife Conservation Prize.

Scott was born in London at 174, Buckingham Palace Road, the only child of Antarctic explorer Robert Falcon Scott and his wife, Kathleen (née Edith Agnes Kathleen Bruce), a sculptor. He was only two years old when his father died. Robert Scott, in a last letter to his wife, advised her to "make the boy interested in natural history if you can; it is better than games." He was named after Sir Clements Markham, mentor of Scott's polar expeditions, and a godfather along with J. M. Barrie, creator of Peter Pan.

Kathleen Scott remarried in 1922. Her second husband, Hilton Young (later Lord Kennet), became stepfather to Peter. In 1923, Peter Scott's half-brother, Wayland Young, was born. Scott was educated at Oundle School and Trinity College, Cambridge, initially reading Natural Sciences but graduating in the History of Art in 1931. At Cambridge, he shared lodging with John Berry and the two shared many views.

As a student he was also an active member of the Cambridge University Cruising Club, sailing against Oxford in the 1929 and 1930 Varsity Matches. He studied art at the State Academy in Munich for a year followed by studies at the Royal Academy Schools, London. One of the few non-wildlife paintings that he produced during his career, Dinghies Racing on Lake Ontario, is held by the Cambridge University Cruising Club.

Like his mother, he displayed a strong artistic talent and he became known as a painter of wildlife, particularly birds; he had his first exhibition in London in 1933. His wealthy background allowed him to follow his interests in art, wildlife and many sports, including wildfowling, sailing, gliding and ice skating. He represented Great Britain and Northern Ireland at sailing at the 1936 Summer Olympics, winning a bronze medal in the O-Jolle monotype class. He also participated in the Prince of Wales Cup in 1938 during which he and his crew on the Thunder and Lightning dinghy designed a modified wearable harness (now known as a trapeze) that helped them win.

During the Second World War, Scott served in the Royal Navy Volunteer Reserve. As a sub-lieutenant, during the failed evacuation of the 51st Highland Division he was the British naval officer sent ashore at Saint-Valery-en-Caux in the early hours of 11 June 1940 to evacuate some of the wounded. This was the last evacuation of British troops from the port area of St Valery that was not disrupted by enemy fire.

Then he served in destroyers in the North Atlantic but later moved to commanding the First (and only) Squadron of Steam Gun Boats against German E-boats in the English Channel.