William Abbott Moseley (October 20, 1798 – November 19, 1873) was an American physician, lawyer and politician from New York.
In 1834 he was drawn into political life by being elected to the New York State Assembly (Erie Co.).
Believing his duties as Senator (and one of the Court of Appeals) somewhat incompatible with his professional employments, he relinquished his practice, which he did not again resume.
Declining a re-election, he made an extended tour in Europe, and the week after his return (in 1842) was nominated for Congress.
He spent the rest his life in Buffalo and abroad, and died at the Fifth Avenue Hotel, New York City, November 19, 1873.