A mechanism for selecting and actuating functions of a timepiece movement comprising a winding stem (1) terminated at one of the ends thereof by a crown, the winding stem (1) being displaceable in rotation and in axial translation, is arranged to occupy three distinct axial positions, namely a first winding position, a second position of selecting one among n functions in response to a rotation of the winding stem (1) about the axis thereof, and a third position of actuating a function kinematically linked to the winding crown. The mechanism further comprises a cam wheel (7) which, when the selection mechanism is in the second position thereof, is kinematically linked to the winding stem (1), the cam wheel (7) including a guide member (8) on which n rest positions are arranged, each corresponding to a function.