QRL is a three letter acronym that can stand for several things: Qingdao Red Lions F.C., a Chinese association football club Quantum Resistant Ledger, a blockchain solution utilizing Post-Quantum Cryptography (PQC) The Queen's Royal Lancers, an armoured regiment of the British Army Queensland Rugby League, the governing body of rugby league football in the Australian state of Queensland QRL, one of the Q codes used in radiocommunication, meaning "I am busy" A QR Code with a URL (web site address) encoded within it