Ryszard Henryk Riedel (September 7, 1956 in Chorzów - July 30, 1994 in Chorzów) – lead singer of the blues-rock band Dżem (Polish for 'jam'), one of the most charismatic artists in the history of Polish rock. He is considered one of the most influential Polish vocalists ever, and has been known to influence artists today with his rough stage presence.

Riedel's direct cause of death was cardiac insufficiency due to long time opiate drugs abuse (especially 'compote', the Polish heroin) Riedel's life story, including his drug abuse and band, can be seen in the Polish movie Destined for Blues (Skazany na bluesa). He is treated as a legend by many people.