The Faculty of Sciences (Spanish: Facultad de Ciencias) at the National Autonomous University of Mexico (UNAM) is the entity where natural and exact science-based majors are taught.

Due to the increasing number of students, the Faculty had to construct new buildings, conveniently located among the research science institutes of Mathematics, Biology and Physics.

The newer part of the complex consists of two buildings, one called Amoxcalli, which holds the Faculty's library and the Computing Center.

The newest one is called Tlahuizcalpan which hosts various labs and research premises, as well as classrooms.

In recent years, an interdisciplinary extension of the Faculty was inaugurated in the port of Sisal, Yucatán, devoted to the research of coastal ecosystems and their species.