TCDD may refer to any of the following:
- 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.
- Texas Council for Developmental Disabilities
This disambiguation page lists articles associated with the title TCDD.
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