ETT may refer to:

• Endotracheal tube
• Embedded training team, a team of U.S. soldiers embedded with the Afghani army to help train its soldiers
• Elementary Teachers of Toronto, a local of the Elementary Teachers Federation of Ontario (ETFO) union.
• Effect of the treatment on the treated (ETT or TOT)
• Exercise tolerance testing (also known as cardiac stress testing)
• Ergothioneine transporter (human gene symbol SLC22A4)
• Evacuated tube transport, a new concept of a transportation system that makes use of vacuum pumps.

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