A hinge for leaves of furniture and the like, which comprises a fixed part which is shaped to be inserted in a seat provided within the thickness of an upper or lower wall of a piece of furniture and a moveable part which can be connected to a leaf of the piece of furniture, the fixed part and the moveable part being mutually connected so as to oscillate by way of an articulation system which comprises at least one articulation axis and a rocker, the hinge further comprising elastic elements for closing the hinge which are functionally connected to the at least one rocker, and a deceleration device which is adapted to decelerate at least part of the closing and/or opening motion of the hinge, the deceleration device being actuated by actuation elements which are entirely concealed within the fixed part of the hinge.