William Jay

• William Jay (minister), English nonconformist minister
• William Jay (architect), English architect who also worked in America, son of the minister
• William Jay (jurist), American reformer, jurist, and the son of Founding Father and first U.S. Supreme Court Chief Justice John Jay
• William Jay (colonel), colonel in the US Army and vice president of the New York Herald
• Bill Jay, English photographer and writer who also lived in America