ECT

• École Canadienne de Tunis, a school in Tunis, Tunisia
• Emirates College of Technology, in Abu Dhabi

• Catalan Workers' Left ({{langx|ca|Esquerra Catalana dels Treballadors|link=no}}), a former political party in France
• Correios, the Brazilian postal service
• Energy Charter Treaty, for cross-border cooperation

• Ecarin clotting time
• Ectomesenchymal chondromyxoid tumor
• Electrochemotherapy
• Electroconvulsive therapy
• Elementary cognitive task
• Emission computed tomography
• Expectation confirmation theory

• Eternal conscious torment, a view of Hell in Christianity
• Evangelicals and Catholics Together, an ecumenical document

• ECN-capable transport, related to Internet explicit Congestion Notification
• Eddy-current testing
• Edge crush test
• Electrical capacitance tomography
• Elementary comparison testing
• European Centre of Technology

• Ealing Community Transport, UK
• East Chicago Transit, in Illinois, US
• Eastern Continental Trail, in eastern North America

• Ecuador Time (UTC−5), standard time zone
• ECT (TV programme), UK, 1985

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