William Darius Bishop (September 14, 1827 – February 4, 1904) was a U.S. Representative from Connecticut.
Born in Bloomfield, New Jersey, Bishop pursued preparatory studies. He graduated from Yale College in 1849. He studied law. He was admitted to the bar but did not practice, instead carrying on his father's railroad enterprises which involved the construction of the Naugatuck and the New York and New Haven Railroads in Connecticut and the railroad between Saratoga Springs and Whitehall in New York. He was a founder of the Eastern Railroad Association and its president until the time of his death.
Bishop was elected as a Democrat to the Thirty-fifth Congress (March 4, 1857-March 3, 1859). He served as chairman of the Committee on Manufactures (Thirty-fifth Congress). He was an unsuccessful candidate for reelection in 1858 to the Thirty-sixth Congress. He served as commissioner of patents from May 23, 1859, to January 1860. He served as vice president and president of the New York, New Haven & Hartford Railroad Co.. He served as a member of the State house of representatives in 1866 and 1871. He served in the State Senate in 1877 and 1878. He died in Bridgeport, Connecticut, February 4, 1904. He was interred at Mountain Grove Cemetery in Bridgeport.