DLO
DLO can refer to:
- Defence Logistics Organisation, a department of the Ministry of Defence (MoD) that supplies the British Armed Forces.
- Dead letter office, a department of the United States Postal Service.
- The IATA location identifier for Delano Municipal Airport in Delano, CA.
- Dense linear ordering in mathematics.
- DayLight Opening, automotive industry term for glassed in areas of a vehicle's cabin