A combination lock (10, 338, 400, 550) with electronic override configured to mount to a standard three-hole locker prep on a door, the combination lock comprising: a locking element (32, 38, 352, 412, 580) translatable between an open position and a closed position; a rotatable drive shaft (118, 254, 306, 438, 574) operatively coupled to the locking element; a knob (40, 252, 352, 302, 408, 556) selectively rotatable between a first position in which the combination lock is in the closed position and a second position in which the combination lock is in the open position; a slider (106, 222, 268, 320, 446) operatively coupled to the knob; one or more rotatable selectors (48, 404, 552, 554, 558, 560) each having multiple indicia disposed thereon; wherein rotation of the one or more rotatable selectors each to a predetermined indicium is configured to shift the slider to operatively couple the slider to the rotatable drive shaft, thereby coupling the knob to the rotatable drive shaft, to shift the combination lock from a locked state to an unlocked state; wherein when the combination lock is in the unlocked state, rotation of the knob causes rotation of the rotatable drive shaft and translation of the locking element, and selectively places the combination lock in the closed position and the open position; a circuit board (108, 440) including a processor; a port (140, 414) in communication with the processor and configured to receive a credential; and an actuator (110, 172, 200, 280, 332, 454) in communication with the processor, wherein upon receipt of a predetermined credential by the processor, the processor is configured to instruct the actuator to shift the slider to operatively couple the slider to the rotatable drive shaft, thereby coupling the knob to the rotatable drive shaft, to shift the combination lock from the locked state to the unlocked state. a locking element (32, 38, 352, 412, 580) translatable between an open position and a closed position; a rotatable drive shaft (118, 254, 306, 438, 574) operatively coupled to the locking element; a knob (40, 252, 352, 302, 408, 556) selectively rotatable between a first position in which the combination lock is in the closed position and a second position in which the combination lock is in the open position; a slider (106, 222, 268, 320, 446) operatively coupled to the knob; one or more rotatable selectors (48, 404, 552, 554, 558, 560) each having multiple indicia disposed thereon; wherein rotation of the one or more rotatable selectors each to a predetermined indicium is configured to shift the slider to operatively couple the slider to the rotatable drive shaft, thereby coupling the knob to the rotatable drive shaft, to shift the combination lock from a locked state to an unlocked state; wherein when the combination lock is in the unlocked state, rotation of the knob causes rotation of the rotatable drive shaft and translation of the locking element, and selectively places the combination lock in the closed position and the open position; a circuit board (108, 440) including a processor; a port (140, 414) in communication with the processor and configured to receive a credential; and an actuator (110, 172, 200, 280, 332, 454) in communication with the processor, wherein upon receipt of a predetermined credential by the processor, the processor is configured to instruct the actuator to shift the slider to operatively couple the slider to the rotatable drive shaft, thereby coupling the knob to the rotatable drive shaft, to shift the combination lock from the locked state to the unlocked state.