William Hayward Jr. (1787 – October 19, 1836) was an American politician.
He studied law, was admitted to the bar in 1809, and commenced practice in Easton.
He served as a member of the Maryland House of Delegates from 1818 to 1820, and was elected as a Crawford Republican to the Eighteenth Congress from the seventh congressional district of Maryland.
Afterwards, he continued the practice of law in Easton until his death there.
He is interred in the family burial ground on his estate, Shipshead.