Ann A. Scott Timmer (born September 12, 1960) is an American lawyer who has served as the chief justice of the Arizona Supreme Court since 2024.

Timmer attended the University of Arizona and graduated with a Bachelor of Arts degree in 1982.

[1] Timmer graduated from Arizona State University College of Law in 1985.

She focused on commercial and employment litigation, and tried capital murder cases both as a defense attorney and as a special prosecutor.

[6] Timmer's sister, Laurie Roberts, is a columnist for the Arizona Republic.