Kim Yoon-seo (; born March 28, 1986), birth name Kim Ga-eun, is a South Korean actress.
Kim made her acting debut in 2009, and has played supporting roles in television dramas such as Glass Mask (2012), You Are the Best! (2013) and 4 Legendary Witches (2014).
In October 2022, Kim signed with new agency SBD Entertainment.