Blair Inskip Swannell (20 August 1875 – 25 April 1915) was an English-born international rugby union forward who played club rugby for Northampton, and internationally for the British Isles and later Australia. He was invited to tour with the British Isles on their 1899 tour of Australia and then their 1904 tour of Australia and New Zealand. He played a total of seven Test matches on these tours, and scored one Test try – against Australia during the 1904 tour. After settling in Australia, Swannell played a single game for his new home when they faced New Zealand. He was viewed as a violent player, and this made his unpopular with other players. Former Australian captain Herbert Moran said of him that "... his conception of rugby was one of trained violence".