Henry Thomas "Harry" Blackstaffe (28 July 1868 – 22 August 1951) was a British rower who competed in the 1908 Summer Olympics.

He was a long-standing member of Vesta Rowing Club in Putney and also a cross-country runner who represented South London Harriers in the National Championships.

As a single sculler, he won nine victories in the London Cup at the Metropolitan Regatta.

[2] At first, he had difficulty in having his entry accepted for Henley Royal Regatta but competed in the Diamond Challenge Sculls in 1905 when he lost to Frederick Septimus Kelly.

He was forty, and his opponent in the final Alexander McCulloch was exactly half his age, and he had won the Diamonds that year.