The cutting device (1) for cutting_shapes in leathers is suitable for mounting in machines for cutting leathers. The device (1) comprises a body (2) exhibiting a end portion (21), and a drum-shaped element (3) exhibiting an external peripheral surface (32). The element (3) is provided, along the said external peripheral surface (32), with a series of housings, and is rotatably mountable on the end portion (21) of the body (2) such that the external peripheral surface (32) thereof can rotate about an axis (C) which is perpendicular to the end portion (21). The device (1) has available a series of cutting tools (31), each of which is provided with a respective cutting edge, having different profiles from one another. Each of the cutting tools (31) is mountable in a corresponding housing of the series of such that the cutting edges thereof face in an external direction. The drum-shaped element (3) is rotatable about the axis (C) with respect to the end portion (21) of the body (2) such that a single cutting tool (31) at a time can be positionable facing the leather and the cutting edge thereof faces towards the leather in which a shape is to be cut.