A single-pin hinge for doors and/or panels of furniture or furnishing items suitable for being positioned between a bottom and a door of a piece of furniture, said hinge being connectable with a fixed part thereof within a recessed seat of the bottom of the furniture and with a movable part thereof, to said door, at least in correspondence with an edge of said door, wherein said fixed part of the hinge comprises a box-like element (15, 16) containing - at least partially a shaped supporting arm of a rotation pin, wherein said rotation pin is the point around which the articulation of the hinge takes place and around which said door is caused to rotate with respect to the bottom, - a shaped connecting rod, at least partially protruding from said box-like element (15,16) and provided with a rototranslation movement, said connecting rod at a first end carrying a pin sliding inside a guiding slot of a plate held in said box-like element (15,16) and at a second end being rotatably connected by means of a plug to an L-shaped joint arranged in correspondence with the edge of said door, - a depth-adjustment block and a horizontal- or side-adjustment block arranged in correspondence with respective holes (33,34) and above said shaped arm; said movable part of the hinge comprises an L-shaped joint arranged in correspondence with the edge of said door a spring also being provided, connected at one end to said plate and at the other end to a slide which can be moved with respect to said plate by means of said sliding pin within a guiding slot and integral with said shaped connecting rod. said fixed part of the hinge comprises a box-like element (15, 16) containing - at least partially a shaped supporting arm of a rotation pin, wherein said rotation pin is the point around which the articulation of the hinge takes place and around which said door is caused to rotate with respect to the bottom, - a shaped connecting rod, at least partially protruding from said box-like element (15,16) and provided with a rototranslation movement, said connecting rod at a first end carrying a pin sliding inside a guiding slot of a plate held in said box-like element (15,16) and at a second end being rotatably connected by means of a plug to an L-shaped joint arranged in correspondence with the edge of said door, - a depth-adjustment block and a horizontal- or side-adjustment block arranged in correspondence with respective holes (33,34) and above said shaped arm; - at least partially a shaped supporting arm of a rotation pin, wherein said rotation pin is the point around which the articulation of the hinge takes place and around which said door is caused to rotate with respect to the bottom, - a shaped connecting rod, at least partially protruding from said box-like element (15,16) and provided with a rototranslation movement, said connecting rod at a first end carrying a pin sliding inside a guiding slot of a plate held in said box-like element (15,16) and at a second end being rotatably connected by means of a plug to an L-shaped joint arranged in correspondence with the edge of said door, - a depth-adjustment block and a horizontal- or side-adjustment block arranged in correspondence with respective holes (33,34) and above said shaped arm; said movable part of the hinge comprises an L-shaped joint arranged in correspondence with the edge of said door a spring also being provided, connected at one end to said plate and at the other end to a slide which can be moved with respect to said plate by means of said sliding pin within a guiding slot and integral with said shaped connecting rod.