| மாபெரும் தெற்கு வழித்தடம் | |
| Grand Southern Trunk Road Chennai-Perambalur–Trichy-Dindigul-Theni Highway | |
 | |
| Location | |
|---|---|
| Country | India |
| State | Tamil Nadu |
| Highway system | |
| State Highways in Tamil Nadu | |
The Grand Southern Trunk Road (GST Road) is a historic major arterial road in the Indian state of Tamil Nadu, forming the principal southern land route from Chennai. Historically, the road connected Chennai with the interior and southern regions of the state, most notably Trichy, and played an important role in trade, administration, and transport during the colonial period.
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After the 2010 renumbering of national highways in India, the precise extent of the GST Road became less clearly defined, and the term is now primarily used to refer to the Chennai–Tindivanam stretch of National Highway 32. The road is also still commonly referred to as NH 45, its designation prior to the 2010 renumbering.
