- (Australian) Imaginary king of the Australian aboriginal people.
- 1902: An' supposen Ole King Billy an' his ole black gin comes round at holiday time and squats on the verander — w:Henry Lawson, Henry Lawson, A Bush Publican's Lament, http://www.gutenberg.org/etext/7065
- Tasmanian aboriginal man w:William Lanne, William Lanne (c.1835-1869) believed to have been the last Tasmanian aboriginal man. (Reference: Bill Wannan, Australian Folklore, Lansdowne Press, 1970, reprint 1979 ISBN 0-7018-1309-1, entry for "King Billy", page 333.)
- One of various other specific aboriginal men referred to as King Billy at times. (Reference: Wannan above.)
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