- DTAG stands for Deutsche Telekom AG
- DTAG stands for Dollar Thrifty Automotive Group, Inc.
- DTAG stands for Destination Tag (Sprint)
- DTAG stands for Defense Trade Advisory Group
- DTAG stands for Dietrich Treuhand AG (German: Dietrich Trust AG; Switzerland)
- DTAG stands for Development Training Advisory Group (UK)
- DTAG stands for Design e Tecnologia das Artes Gráficas (Design and Graphic Art’s Technology, Portugal)
- DTAG stands for Dental Technology Action Group (New Zealand)
- DTAG stands for Dutch Tactical Assault Group
DTAG