Harry Schelwald Swarth (January 26, 1878 – October 22, 1935) was an American ornithologist.Swarth was born in Chicago, Illinois; during his childhood, he was interested in birds and natural history. He began collecting birds in 1894 and attended Baptist College, Los Angeles after grammar school. In 1891, his family moved to Los Angeles. In 1896, he joined the first extended natural history collecting expedition in Arizona.