Alexander Gahon Gesmundo (born November 6, 1956) is serving as the chief justice of the Philippines since April 5, 2021.

Gesmundo is the fourth chief justice appointed by President Rodrigo Duterte[2] and the third Atenean to assume the post of the high tribunal.

[5] He was on seconded appointment as commissioner of the Presidential Commission on Good Government from July 17, 1998 to February 15, 2001.

[5] After 20 years with the OSG, he was then appointed as an associate justice of the Sandiganbayan on October 15, 2005, later as chairperson of its seventh division and co-chairperson of the Committee on Rules.

On August 14, 2017, Gesmundo became the 178th Supreme Court magistrate, assuming the post vacated by Justice Jose C. Mendoza who reached mandatory retirement age.