William Watson McIntire (June 30, 1850 – March 30, 1912) was a U. S. Representative from Maryland's 4th congressional district.

He attended Hagerstown Academy and graduated from the University of Maryland School of Law in Baltimore.

He is generally credited with obtaining the first appropriation for a new Custom House in Baltimore and with defeating a bill to move the United States Naval Academy to a Northern city.

When General Peter Leary, Jr. died in 1911, he was strongly put forward to take his place on the Baltimore Sewerage Commission.

While still on the commission, he died on a boat in the Gunpowder River in Baltimore County, Maryland, having been stricken by apoplexy when fishing for pike alone.