Gwanaksan (632 mSome sources give 629 m) is a small mountain in southern Seoul, South Korea. Portions lie in the Gwanak-gu and Geumcheon-gu districts of Seoul; other portions lie in the neighboring cities of Anyang and Gwacheon.

The name gwanak () means "hat-shaped peak," and refers to its gat-like profile. Thus Gwanaksan literally means "mountain of the hat-shaped peak." In older maps it was simply referred to as "Gwanak," since ak already contains the meaning of "mountain." Together with Songaksan in Kaesong, Gamaksan in Paju, Uaksan in Pocheon, and Hwaaksan in Gapyeong, Gwanaksan was long considered one of the five representative peaks of Gyeonggi-do (gyeonggi o-ak).

The main campus of Seoul National University is located to the northwest of the mountain, and the Gwacheon national government complex to the east. Also nearby is the Anyang Resort Area, a popular local tourist attraction. On the mountain itself lie numerous Buddist temples, including Wongaksa. Most of the mountain slope is protected land. The Seoul side was designated a city park in 1968.

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