William Rea may refer to:

• William Rea (ironmaster) who lived in Monmouth (now in Wales) in the early 18th century
• William Rea (politician), Member of the Queensland Legislative Assembly, Australia
• William Rea (musician) (1827–1903), English organist and pianist
• William Rea (real estate magnate) (1912–2006) of Pittsburgh, Pennsylvania
• William Rea (athlete) (born 1952), Austrian-American long jumper
• William J. Rea (1920-2005), U.S. federal judge

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