FC Seoul Reserves are the reserve team of FC Seoul. Reserve team is member of the R League (Reserve League).
FC Seoul Academy is the youth system of FC Seoul. The academy consists of U-18 Team, U-15 Team, U-12 Team and Future of FC Seoul. The Future of Seoul U-12, U-15, and U-18 are considered to be a part of the academy, while the rest are for young players playing as a hobby. U-18 Team is a member of the K League Junior (Youth League).