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A.S. Blue or After School Blue (애프터 스쿨 푸른) was a sub-unit for the South Korean K-Pop girl group, After School, under Pledis Entertainment. The unit was decided by fan voting, and the lineup finalized on July 11th, 2011. A.S. Blue included 4 members: Jooyeon, Raina, Lizzy, and E-Young. They debuted on July 20th, 2011, with the single albums "Wonder Boy" and "Lady".
All members left After School and it is unclear if there are any future plans for the group or sub-unit.