Bamna is a census town within the jurisdiction of the Usthi police station in the Magrahat I CD block in the Diamond Harbour subdivision of the South 24 Parganas district in the Indian state of West Bengal.

In the eastern portion of the subdivision (shown in the map alongside) there are 24 census towns.

Bamna is located at 22°13′07″N 88°20′32″E / 22.2185°N 88.3422°E / 22.2185; 88.3422 Usthi, Ghola Noapara, Barijpur and Uttar Kusum form a cluster of census towns in the Magrahat I CD block.

This is as per the map of the Magrahat I CD block on page 445 in the District Census Handbook for the South 24 Parganas.

This article about a location in the South 24 Parganas district of West Bengal is a stub.