William Carew Hazlitt, known professionally as W. Carew Hazlitt, was an English lawyer, bibliographer, editor and writer. He was the son of the barrister and registrar William Hazlitt, a grandson of the essayist and critic William Hazlitt, and a great-grandson of the Unitarian minister and author William Hazlitt. William Carew Hazlitt was educated at the Merchant Taylors' School and was called to the bar of the Inner Temple in 1861.