A floatable electrical connector assembly comprises a fixed housing (10) defining a front receiving frame (112) having an edge section (113). A movable housing (20) is discretely and movably attached to the fixed housing (10) in an up-to-down direction and adapted to be rested on the edge section of the receiving frame. One of the movable housing and the fixed housing defines a mating bar (217) while the other one of the movable housing and the fixed housing has a receiving slot (119) defining an enclosed boundary for receipt of the mating bar so as to permit the movable housing stably movable relative to the fixed housing in the up-to-down direction.