National Highway 183A, also known as NH 183A, is a National Highway in the Indian state of Kerala that runs from Chavara Titanium Junction, Kollam, to Vandiperiyar via Adoor and Pathanamthitta.

The road was declared a National Highway (NH) on 4 March 2014.

It conforms to NH standards for a two-lane traffic highway from Adoor to Plapally.

The section past Plapally is only 4 meters wide and passes through forest and wildlife areas.

Currently the stretch between Angamoozhy Forest Checkpost and Vallakadavu Forest Checkpost is entry restricted and the forest department allows only 30[4] private vehicles per day on the route and vehicles entering through Kochandi Check post has to leave only through Vallakkadavu Check post before 6 pm.