Lee Gi-kwang (Korean: 이기광; born March 30, 1990), known professionally as Gikwang or Kikwang, is a South Korean singer, songwriter and actor. He originally debuted as solo singer with the stage name AJ (Ace Junior), releasing his first mini album First Episode: A New Hero on April 4, 2009. In October 2009, he debuted as the main dancer, visual and a lead vocalist of boy group Beast, which was renamed Highlight in February 2017.

He began his acting career with a supporting role in the popular television sitcom High Kick Through the Roof (2009–10) and had supporting roles in dramas My Princess (2011), Me Too, Flower! (2011), Mrs. Cop (2015), Monster (2016), Circle (2017), and Lovely Horribly (2018), He also became an MC for various shows such as Hot Brothers and Inkigayo.