Bohyeonsan or Bohyeon Mountain or Mount Bohyeon is located in North Gyeongsang Province, eastern South Korea. Its peak has an elevation of , and is near Yeongcheon.

The Bohyeon Mountain Starlight Festival takes place in summer and is centered in the Bohyunsan Optical Astronomy Observatory, which was established in 1996."Bohyunsan Optical Astronomy Observatory (BOAO)", Korea Astronomy and Space Science Institute, retrieved December 27, 2017.

This observatory houses the third-largest telescope in Korea, which is the country's largest optical instrument."Observing the unknown from Korea's peaks", Korea Joongang Daily (January 11, 2012). This 1.8-meter reflecting telescope was built near the peak. There is also a Bohyeon Mountain Science Museum, situated just below the observatory, run by the Yeongcheon City Government.

See also List of mountains of Korea Bohyeonsa, temple in Yeongcheon

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