Reinhold Mack (aka Mack) is a German record producer and sound engineer, mostly known for his collaborations with rock bands Electric Light Orchestra and Queen. Most of this work took place at Giorgio Moroder's Musicland Studios in Munich, which became famous after Marc Bolan & T.Rex (with producer Tony Visconti) first discovered it for recordings in 1973. In 1981 the Queen album The Game brought Mack and the band a Grammy Award nomination for Producer of the Year (Non-Classical).
Mack's third son, John Frederick Mack, was named by Freddie Mercury and was a godson of both Mercury and Queen bassist John Deacon.
Mack is referenced in the lyrics of the Queen song "Dragon Attack" on their 1980 album The Game, which he produced with the band: "gonna use my stack/it's gotta be Mack".