An rear seat table assembly for a vehicle, the rear seat table assembly may include a rear seat table placed in front of a rear seat console, wherein the rear seat table includes an upper table and a lower table which may be selectively foldable around a table hinge portion pivotally connecting the upper table and the lower table, a locking unit arranged in the rear seat console and selectively lock the rear seat table to the rear seat console so as to maintain or release a locking state of the rear seat table, a rotation unit rotatably connecting the rear seat table and the rear seat console for allowing the rear seat table to be fixed after the rear seat table may be rotated upward centering around a rotation axis (axis X) which may be fixed to an upper side of the rear seat console, and a swiveling unit connected between the rotation unit and the rear seat table for allowing the rear seat table to swivel centering around a swiveling axis (axis Z).