William Anson Barclay[1][2] (born January 5, 1969)[3] is an American politician and attorney from the State of New York.

[5] After graduating from law school, he served as a clerk for Roger Miner, a judge of the United States Court of Appeals for the Second Circuit.

[7] Barclay was first elected to the State Assembly on November 5, 2002,[6] defeating Democrat E. Clyde Ohl by a margin of 21,848 to 14,594.

Barclay lost the election to Democratic Assemblyman Darrel Aubertine on February 27, 2008.

[17] On January 7, 2020, Barclay was unanimously elected to the post of Assembly Minority Leader by his Republican colleagues[5] following the resignation of Brian Kolb.