Barry Watson is an open water swimmer from Great Britain who was inducted in the International Marathon Swimming Hall of Fame in 1973 as an Honour Swimmer. Watson set a world record in the English Channel in 1964 in 9 hours 35 minutes. He also swam the English Channel in 15 hours 21 minutes in 1968, in 13 hours 56 minutes in 1969, and in 15 hours 14 minutes in 1970.
He was also the British Long Distance Swimming Association champion in Windermere in 1963 and 1964, the 1967 British Long Distance Swimming Association Loch Lomond champion, the British Long Distance Swimming Association 2-way Lake Windermere champion in 1966, 1967 and 1968, and the British Long Distance Swimming Association champion from Fleetwood to Morecambe in 1963, 1965, 1966 and 1967. He swam Windermere more than 20 times.