The University of the Philippines Astronomical Society (UP Astrosoc) is a non-profit, non-political and non-partisan organization in the University of the Philippines, Diliman devoted to the study and promotion of astronomy to the students.

It was established in 1991 by 22 undergraduate students in the stairs near the UPPA tambayan, and later at the poolside. UP Astrosoc now resides at the PAGASA Astronomical Observatory inside UP Diliman.

On the average, the organization has an active membership of 25-30 undergraduate students coming from different colleges in the university. Aside from the usual social activities of a college organization, UP Astrosoc also partakes in several astronomy activities throughout the academic year. These include astronomy classes, observing sessions, public astronomy lectures and forums.

The emblem for the organization is a stylized telescope pointing towards the skies. This is in touch with the organization's motto, Ad Astra Per Aspera -To the stars through difficulties.