RQ

RQ may refer to:


 * RQ series, a reconnaissance unmanned aerial vehicle designator of the United States Defense Department
 * Kam Air (IATA designator RQ)
 * Puerto Rico (FIPS 10-4 country code RQ)
 * Reference Quarterly
 * Renaissance Quarterly, a scholarly journal published by the Renaissance Society of America
 * Respiratory quotient, used in calculations of basal metabolic rate
 * RuneQuest, a role-playing game
 * Research question, the formulation of which is often the first step in a research process