GTI

GTI may refer to:

"motor vehicles":
* Grand Tourer Injection, an automobile model variant with fuel injection, often a "hot hatch":
**Citroën AX GTI
**Maserati 3500 GTI
**Nissan Almera GTi
**Peugeot 106 GTI
**Peugeot 205 GTI
**Peugeot 206 GTI
**Peugeot 207 GTI
**Peugeot 306 GTi
**Proton Satria GTi
**SEAT Ibiza GTI
**Suzuki Swift GTi
**Volkswagen Golf GTI
**Volkswagen Polo GTI
* GTi Engineering, a former British racing team which was later known as "Richard Lloyd Racing".

"other":
* Grounded Theory Institute, a non-profit web based organization aimed at being a resource to grounded theory researchers all over the world
* GT Interactive, a video game publisher and distributor
* Groupe Technologie Innovation, A B2B company
* Guilford Transportation Industries, the former name of Pan Am Systems, a privately held transportation holding company
* Gateway Terminal of India
* In neuropharmacology (see glutamate, glycine, neurotransmission)
**Glutamate transport inhibitor
**Glycine transport inhibitor