William Lilly (11 May [O.S. 1 May] 1602 – 9 June 1681), was an English astrologer famed during his time. Lilly was particularly adept at interpreting the astrological charts drawn up for horary questions, as this was his specialty.

Lilly caused much controversy in 1652 for allegedly predicting the Great Fire of London some 14 years before it happened. For this reason many people believed that he might have started the fire, but there is no evidence to support these claims. He was tried for the offence in Parliament but was found to be innocent.

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