TGV inOui is the brand name of premium TGV train services operated by SNCF since 27 May 2017 on certain high speed rail services.

[1] SNCF is in the process of replacing 'classic' TGV services with the premium inOui and low-cost Ouigo brands in preparation for the future opening of France's high-speed rail infrastructure to competition.

The name 'inOui' was adopted because it resembles the French word inouï meaning “extraordinary” (or literally, “unheard of”).

[2] In 2017, TGV inOui trains were tested on the Paris – Bordeaux – Toulouse line.

Its aim is to replace existing TGV services with "plus de confort, de services et de connectivité" (English: "more comfort, services and connectivity").