Conductor
The term conductor may refer to:

 Conductor (music), the person responsible for directing a musical performance
 Conductor (physics), a medium that conducts electricity, heat, or sound
 Plasma conductor, a conductor of plasma
 Positronic conductor, a conductor of positrons
 Voice-transit conductor, a type of sound conductor
 Conductor (rail), the person responsible for directing passengers on a train
 Moon shuttle conductor
 Test conductor, a title held by a Starfleet officer