Alfredo Mahar Francisco Amante Lagmay (born October 4, 1966) is a Filipino geologist.

He is executive director of Project NOAH (Nationwide Operational Assessment of Hazards) and a professor at the National Institute of Geological Sciences of the University of the Philippines Diliman.

[5] Upon returning to the university as a professor, his research interest focused on volcanic behavior and implications for human activities.

[7] Lagmay has published detailed analyses of major disasters in the Philippines such as the Guinsaugon landslide; Mayon eruptions; typhoons Ondoy, Sendong, Pablo, and Yolanda; and storm surges.

[1] In 2013, Lagmay was awarded the Outstanding Filipino for Geology and Earth Science,[2] and was awarded as "WikiPinoy of the Year" by WikiPilipinas in 2014 for “empowering the public with open information and insight into the significant issues affecting the country today.”[7] Lagmay was awarded the Plinius Medal by the European Geosciences Union on 15 April 2015, in Vienna, Austria, for his "outstanding interdisciplinary natural-hazard research and natural-disaster engagement in the Philippines, particularly with respect to volcanic hazards, earthquakes, typhoons, landslides and floods.