Frederick O'Brien (16 June 1869 – 9 January 1932) was an American author, journalist, hobo, peripatetic world traveler, and public administrator. He wrote three best-selling travel books about French Polynesia between 1919 and 1922: White Shadows in the South Seas, Mystic Isles of the South Seas, and Atolls of the Sun. A movie was made in 1928 of White Shadows in the South Seas.