The abbreviation QOS could refer to one of several things: Quality of service (QoS), a measure of the reliability of a computer network or telephone service Quantum of Solace, a number of works related to James Bond. Quarterdeck Office Systems, a software company that's now part of Symantec Queen of the South F.C., a Scottish football club Queensland Ornithological Society, a state birding organisation in Australia… (More on Qos)