William Barber (2 May, 1807–31 August, 1879) was Chief Engraver of the United States Mint from 1869 until his death. He succeeded James B. Longacre in the position. Barber holds the rather dubious distinction of being one of only two Chief Engravers of the Mint in the 19th century not to have designed any major circulating coinage. (The other was William Kneass .)

Barber was succeeded as Chief Engraver by his son Charles.