An adjustable tray table assembly for a vehicle seat including a bi-fold tray table, an adjustment assembly for adjusting the tray table in the fore/aft and lateral directions, a support arm for supporting the tray table and slidably receiving the adjustment assembly, and an attachment arm interconnected with the support arm for attaching the tray table assembly to the vehicle seat. The adjustment assembly includes a guide bracket that slides both within an elongated opening of the support arm and along at least one guide attached to the tray table to provide the adjustability.