John R. Lopez IV (born 1968)[1] is an American lawyer who has served as the vice chief justice of the Arizona Supreme Court since 2024.

Lopez received his bachelor's degree in political science and Middle Eastern studies from the University of Texas at Austin in 1992.

After law school Lopez clerked for Justice Charles Jones of the Arizona Supreme Court.

[3] On November 28, 2016, Governor Doug Ducey announced the appointment of Lopez to the Arizona Supreme Court to a newly created seat.

[4] In April 2024, Lopez authored a 4-2 decision in Planned Parenthood Arizona v. Mayes finding that the state's "territorial-era law outlawing abortion except to save the life of the mother is enforceable.