TCDD may refer to:
- Turkish State Railways (Türkiye Cumhuriyeti Devlet Demiryolları), the national railway carrier of Turkey
- TCDD Taşımacılık, a Turkish transport company responsible for railway operations
- 2,3,7,8-Tetrachlorodibenzodioxin, a type of dioxin
This disambiguation page lists articles associated with the title TCDD.
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