MQD or mqd can refer to:

Macquarie Dictionary, a dictionary of Australian English Madang, a dialect of the Mainstream Kenyah language, spoken in Indonesia and Malaysia, by ISO 639 code Manganoquadratite, a mineral; see List of mineral codes Maquinchao Airport, an airport in Maquinchao, Argentina, by IATA code Medallion Qualification Dollars, a type of frequent flier point offered in the SkyMiles program, run by American airline Delta Air Lines Mirdad Muafi railway station, a train station in Pakistan Major questions doctrine, a principle of interpretation in United States law