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William Oughtred
Wenceslas Hollar - William Oughtred.jpg
William Oughtred (1574-1660). Engraving by Wenceslaus Hollar.
Born (1574-03-05)5 March 1574
Died 30 June 1660(1660-06-30) (aged 86)
Albury, Surrey, England
Nationality English
Education Eton College
Alma mater King's College, Cambridge
Known for Slide rule
multiplication "×" sign
Scientific career
Fields Mathematician
Institutions King's College, Cambridge
Notable students John Wallis
Christopher Wren
Richard Delamain
Seth Ward

William Oughtred 5 March 1574 – 30 June 1660) was an English mathematician and Anglican clergyman.

John Napier invented logarithms and Edmund Gunter created the logarithmic scales. Oughtred was the first to use two such scales. He slid one next to another to do direct multiplication and division. He is credited with inventing the slide rule in about 1622.

He also introduced the "×" multiplication sign and the abbreviations "sin" and "cos" for the sine and cosine functions.

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