William Jacob may refer to:

• William Jacob (MP, died 1851) (c. 1761–1851), English merchant, shipowner, scientist, and MP for Westbury, and for Rye
• William Jacob (Canterbury MP) (c. 1623–1692), English physician and politician
• William Stephen Jacob (1813–1862), English astronomer in India
• William Ungoed Jacob (1910-1990), Anglican priest and author
• William Jacob, Irish baker, namesake of the brand Jacob's
• William Mungo Jacob, known as Bill Jacob (born 1944), Anglican priest and author

• All pages with titles beginning with William Jacob
• All pages with titles containing William Jacob
• William Jacobs (disambiguation)

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