Kwon Un-sil (born September 17, 1983 in Hamhung, South Hamgyong) is an athlete from North Korea who competes in archery.

At the 2008 Summer Olympics in Beijing Kwon finished her ranking round with a total of 656 points.

This gave her the 5th seed for the final competition bracket in which she faced Najmeh Abtin in the first round, beating the archer from Iran with 106–96.

In the second round she was too strong for Pranitha Vardhineni with 106-99 and via Aida Román (105-100) she achieved her place in the quarter-final.

In the semi-final Kwon was unable to beat first seed Park Sung-hyun who won the match 109–106.