ECT

ECT may be an abbreviation for
* Environmental Compliance Technician, a specialist hired by companies to reduce their environmental damage and avoid fines.
* Electroconvulsive therapy, also known as electroshock therapy, a medical treatment.
* Emission Computed Tomography, see: Single Photon Emission Computed Tomography.
* Ealing Community Transport, a social enterprise in England.
* Eddy-current testing, a nondestructive testing technique for metal objects.
* Electrical capacitance tomography, an industrial process imaging technique.
* Catalan Workers' Left (Esquerra Català dels Treballadors), a Catalan leftwing nationalist group.
* Eau Claire Transit, the transit in Eau Claire, Wisconsin.
* ECN-capable transport, a transport layer capable of using Explicit Congestion Notification.
* Empresa Brasileira de Correios e Telégrafos, the Brazilian postal service
* Edge crush test, a standard test of the strength of cardboard boxes.
* Evangelicals and Catholics Together
* Evening Civil Twilight, from sunset to when the center of the Sun is more than 6° below the horizon.
* Electronic Card Transactions, a statistical series published by the New Zealand Government statistical agency, Statistics New Zealand, and measuring spending through cards processed electronically at the point of sale.
* Elementary cognitive task a simple task used in intelligence testing

It may also refer to:
* European Centre for Theoretical Studies in Nuclear Physics and Related Areas, in Trento, Italy.
* Europe Container Terminals, a container port company.
* Electronic control transmission.
* East Coast Terminal, a skatepark in Johnson City, New York.
* Engine Coolant Temperature (Automotive).
* Ecuador Time zone.
* European Central Time zone, a misnomer for Central European Time.
* Eastern Caribbean Time zone.
* European Credit Transfer, to guarantee academic recognition of studies abroad, enabling students to have access to regular courses alongside local students.

Or it can be a misspelling of:
* etc.