Allen Joseph Bard (December 18, 1933 – February 11, 2024) was an American chemist. He was the Hackerman-Welch Regents Chair Professor and director of the Center for Electrochemistry at the University of Texas at Austin. Bard developed innovations such as the scanning electrochemical microscope, his co-discovery of electrochemiluminescence, his key contributions to photoelectrochemistry of semiconductor electrodes, and co-authoring a seminal textbook.