A.S. Red or After School Red (애프터 스쿨 레드) is a sub-unit for the South Korean girl group After School, signed under Pledis Entertainment. The unit was decided by fan voting, and the line-up was finalized on July 11th, 2011. A.S. Red includes 4 members: Kahi (graduated), Jungah (graduated), UEE (graduated), and Nana who is currently the only member left.
A.S. Red debuted on July 20th, 2011 with their single album "RED". The sub-unit was created to be competitive towards A.S. Blue or After School Blue, both having different concepts.
In June 2012, Pledis Entertainment announced that Kahi would graduate from the group to pursue a solo career and to study acting.
On January 28th, 2016, Pledis Entertainment announced that Jungah would graduate from the group due to the expiration of her contract after seven years of activity.
On May 31st, 2017, Pledis Entertainment announced that UEE had graduated from the group due to the expiration of her contract after eight years of activity.