Established in 2003, The Institute of Environmental Science & Meteorology, or IESM, is an academic unit of the College of Science in the University of the Philippines, Diliman.

Created by merging the Environmental Science Program (ESP) and the Department of Meteorology and Oceanography (DMO), IESM is envisioned as a leading center for environmental and atmospheric sciences in the Asia Pacific. The institute focuses on understanding natural phenomena that influence key decisions on sustainable development in the Philippines and the region.

IESM is dedicated to advancing the study of human impacts on the environment, predicting weather and climate patterns, and managing atmospheric and hydro-meteorological hazards. The institute now has 11 full-time faculty members, 4 professorial lecturers, and a growing number of Adjunct Professors. Since relocating to a new facility in 2014, IESM‘s research activities have significantly expanded

In December 2015, IESM was named a Center of Excellence for Environmental Science by the Commission on Higher Education. Additionally, in partnership with the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), IESM serves as a Regional Training Center for the World Meteorological Organization Region.