DEQ may refer to:
- Delivered Ex Quay, an Incoterm
- Department of Environmental Quality, any of various U.S. state agencies:
- Arkansas Department of Environmental Quality
- Idaho Department of Environmental Quality
- Louisiana Department of Environmental Quality
- Michigan Department of Environmental Quality
- Montana Department of Environmental Quality
- Oklahoma Department of Environmental Quality
- Oregon Department of Environmental Quality
- Utah Department of Environmental Quality
- J. Lynn Helms Sevier County Airport, De Queen, Arkansas, United States
- Deqing Moganshan Airport, in Zhejiang, China
- Double-ended queue
- Deq (tattoo), traditional Kurdish tattoos