John Laurence Tann (born 1890) was an English rower who won the Wingfield Sculls, the amateur single sculling championship of the River Thames, in 1914.
Tann studied engineering at London University and entered the family safe business.
[1] He joined Thames Rowing Club and in 1914 won the Wingfield Sculls and the London Cup at the Metropolitan Regatta.
[3][4] Tann was the last member of the family to run the safe making company, and having no male heir, sold the business in 1965.
His grandson Tim Crooks was an Olympic rower who also won the Wingfield Sculls.