QA Quality Assurance

QAZ Quick Access Zone

QD Quiet down

QED Quid Erat Demonstrandum
QED Quite Easily Done
QED Quod Erat Demonstrandum

QFE Quick Fix Engineering

QFT Quantum Field Theory
QFT Quoted for truth

QMWIH Quick my wife is home

QOS Quality of service

QOTW Questions of the Week

QPG Quid Pro Quo

QPSA Que pasa

QQ Quick Question

QS Quit Scrolling

QST Calling All stations ham radio

QT Cutie

QUALGO Quasi Autonomous Local Government organization

QUANGO Quasi Autonomous Non-Governmental Organization

QVGA Quarter Video Graphic Array