Guy Newell Boothby (13 October 1867 – 26 February 1905) was a prolific Australian novelist and writer, noted for sensational fiction in variety magazines around the end of the nineteenth century. He lived mainly in England. He is best known for such works as the Dr Nikola series, about an occultist criminal mastermind who is a Victorian forerunner to Fu Manchu, and Pharos, the Egyptian, a tale of Gothic Egypt, mummies' curses and supernatural revenge. Rudyard Kipling was his friend and mentor, and his books were remembered with affection by George Orwell.
Boothby was born in Adelaide to a prominent family in the recently established British colony of South Australia. His father was Thomas Wilde Boothby, who for a time was a member of the South Australian Legislative Assembly, three of his uncles were senior colonial administrators, and his grandfather was Benjamin Boothby (1803–1868), controversial judge of the Supreme Court of South Australia from 1853 to 1867. When Boothby was aged approximately seven his English-born mother, whom he held in great regard, separated from his father and returned with her children to England. There he received a traditional English grammar school education at Salisbury, Lord Weymouth's Grammar (now Warminster School) and Christ's Hospital, London.
Following this, Boothby returned alone to South Australia at sixteen, where, in his turn, he entered the colonial administration as private secretary to the mayor of Adelaide, Lewis Cohen, but was "not contented" with the work. Despite Boothby’s family tradition of colonial service, his natural inclinations ran more to the creative than to the administrative and he was not satisfied with his limited role as a provincial colonial servant. In 1890, aged 23, Boothby wrote the libretto for a comic opera, Sylvia, which was published and produced at Adelaide in December 1890, and in 1891 his second show, The Jonquil: an Opera, appeared. He also wrote and performed in an operetta, Dimple's Lovers, for Adelaide's Garrick Club theatre group. The music in each case was written by Cecil James Sharp. His first literary ventures were directed at the theatre, but his ambition was not appeased by the lukewarm response his melodramas received in Adelaide. Hence when severe economic collapse hit most of the Australian colonies in the early 1890s, he followed the well-beaten path to London in December 1891.