A low-bulkiness hydraulic hinge for rotatably moving and controlling a closing element, such as a door, a shutter or the like, anchored to a stationary support structure, such as a wall or a frame, between an open position and a closed position, the hinge comprising: - a hinge body anchorable to one of the stationary support structure and the closing element, said hinge body internally comprising a working chamber with a front wall and a bottom wall faced thereto, said hinge body having a substantially plate-like shape to define a first plane ( π'); - a pivot defining a first longitudinal axis anchorable to the other of the stationary support structure and the closing element, said pivot and said hinge body being reciprocally coupled to each other to rotate around said first axis between the open position and the closed position of the closing element; - a slider slidably movable within said working chamber along a second axis between a position distal from said bottom wall and a position proximal thereto, said pivot and said slider being reciprocally coupled so that the rotation of the closing element around said first axis corresponds to the at least partial sliding of said slider along said axis, said slider including an axial blind hole; - hydraulic damping means acting on said slider to hydraulically damp the movement of the closing element during opening and/or closing movement, said hydraulic damping means including a working fluid entirely contained in a hydraulic circuit internal to said slider; - a separation element fixed on said hinge body and inserted within said axial blind hole to remain faced to the bottom wall thereto, the slider sliding along said second axis with respect to said fixed separation element; - a support rod defining said second axis having an end reciprocally connected to the bottom wall of said working chamber and the opposite end ( 17") inserted within said blind hole to reciprocally connect to said separation element; - counteracting elastic means encompassing said support rod to remain interposed between said bottom wall of said working chamber and said slider to act on the latter in such a manner to return it from the proximal position to the distal position; wherein said hydraulic circuit includes the blind hole of said slider, said separation element dividing the latter in at least one first and one second variable volume compartments ( 51', 51") fluidly communicating with each other and preferably adjacent, said at least one first and one second variable volume compartments ( 51', 51") being configured to have at the distal position of said slider respectively the maximum and the minimum volume; wherein said separation element comprises at least one passing-through opening to put in fluid communication said at least one first variable volume compartment and said at least one second variable volume compartment ( 51") and valve means including an obstructing element interacting with said opening to allow the controlled passage of the working fluid between said at least one first compartment and at least one second compartment ( 51', 51"). - a hinge body anchorable to one of the stationary support structure and the closing element, said hinge body internally comprising a working chamber with a front wall and a bottom wall faced thereto, said hinge body having a substantially plate-like shape to define a first plane ( π'); - a pivot defining a first longitudinal axis anchorable to the other of the stationary support structure and the closing element, said pivot and said hinge body being reciprocally coupled to each other to rotate around said first axis between the open position and the closed position of the closing element; - a slider slidably movable within said working chamber along a second axis between a position distal from said bottom wall and a position proximal thereto, said pivot and said slider being reciprocally coupled so that the rotation of the closing element around said first axis corresponds to the at least partial sliding of said slider along said axis, said slider including an axial blind hole; - hydraulic damping means acting on said slider to hydraulically damp the movement of the closing element during opening and/or closing movement, said hydraulic damping means including a working fluid entirely contained in a hydraulic circuit internal to said slider; - a separation element fixed on said hinge body and inserted within said axial blind hole to remain faced to the bottom wall thereto, the slider sliding along said second axis with respect to said fixed separation element; - a support rod defining said second axis having an end reciprocally connected to the bottom wall of said working chamber and the opposite end ( 17") inserted within said blind hole to reciprocally connect to said separation element; - counteracting elastic means encompassing said support rod to remain interposed between said bottom wall of said working chamber and said slider to act on the latter in such a manner to return it from the proximal position to the distal position;