TEF is an acronym for:
- Tracheoesophageal fistula, a medical condition.
- The Elias Fund, A nonprofit organization.
- Test d'évaluation du français, a test of fluency in French for non-native speakers.
- Thermic effect of food, an increment of energy expenditure.
- Total enclosure fetishism, a form of sexual fetishism.
- Tennessee Ernie Ford
- The Endless Forest, an online game.
- Transferência Eletrônica de Fundos, electronic transfers of payment used in Brazil
- Toxic equivalent factor for dioxins and dioxin-like compounds
- The stock symbol for Telefónica
- TEF, an acoustical measurements and instrumentation product by Gold Line, standing for Time Energy and Frequency
- Tout est foutu, a French rearguard metaphysics newspaper.
- Le tef, un culture céréalière en Éthiopie