QSR can refer to:
Quick service restaurants, also known as fast food restaurants,
Quasar - Quasi-Stellar Radio-source,
Salerno Costa d'Amalfi Airport, IATA airport code,
Quality System Regulation - USA FDA regulations requiring manufacturers to implement and follow quality systems,
QSR International - Melbourne based software developer specialising in Qualitative Research Software,
Q codes for Amateur_radio,
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