Vadakadu is one of the largest villages in Alangudi, Tamil Nadu, India.

Mariamman Temple is a Hindu temple in the village.

The temple's annual festival falls in May as well as Sithirai.

People are mostly engaged in agriculture.

Vadakadu is located at 10°20′30″N 79°03′39″E / 10.341771°N 79.060879°E / 10.341771; 79.060879 Nearby villages are Pullanviduthi, Avanam