Master control room (MCR) is the technical hub of a broadcast operation common among most over-the-air television stations and television networks. MCR is distinct from a SCR in television studios where the activities such as switching from camera to camera are coordinated.

MCR is the final point before a signal is transmitted over-the-air for terrestrial television or cablecast, satellite provider for broadcast, or sent on to a cable television operator. Television’s MCRs include sets of video monitors, satellite receivers, videotape machines, video servers, transmission equipment, and computer broadcast automation equipment for recording and playback of television programming.

MCR is generally staffed with one or two master control operators by 24 x7 to ensure continuous operation. Master control staffs are responsible for monitoring the quality and accuracy of the on-air product, ensuring the transmission meets government regulations, troubleshooting equipment malfunctions, and preparing programming for playout. Regulations include both technical ones (such as those against over-modulation and dead air), as well as content ones (such as indecency and station ID).

Many television networks and radio networks or station groups have consolidated facilities and now operate multiple stations from one regional master control or centralcasting center.