Iñaki Williams Arthuer (born 15 June 1994) is a professional footballer who plays as a forward for and captains La Liga club Athletic Bilbao.
Developed at Athletic Bilbao's academy, he has made over 500 first-team appearances for the club, including a La Liga record of 251 consecutive matches. He scored the winning goal of the 2020–21 Supercopa de España, and also won the 2023–24 Copa del Rey.