Organizations
- Ealing Community Transport, a social enterprise in England
- Eau Claire Transit, the transit in Eau Claire, Wisconsin
- (Empresa Brasileira de Correios e Telégrafos) Correios, the Brazilian postal service and postal administration
- (Esquerra Català dels Treballadors) Catalan Workers' Left, a Catalan leftwing nationalist group
- European Centre for Theoretical Studies in Nuclear Physics and Related Areas, in Trento, Italy
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