Guy Newell Boothby (13 October 1867 – 26 February 1905) was an Australian novelist.

The Works of Guy Boothby, contains 21 books, including: Dr. Nikola: A Bid for Fortune Dr. Nikola Returns The Lust of Hate Dr. Nikola Experiment ‘Farewell Nikola’ Other works: The Beautiful White Devil A Cabinet Secret The Childerbridge Mystery A Crime of the Under-seas The Duchess of Wiltshire’s Diamonds

Guy Newell Boothby was born in Adelaide, South Australia, the son of Thomas Wilde Boothby, a Member of the South Australian House of Assembly. At six years of age he travelled with his mother to England and was educated at Lord Weymouth's Grammar School, Salisbury and at Christ's Hospital, London between 1874 and 1883.