Kalna or Ambika Kalna is a town in the Purba Bardhaman district of West Bengal, India. It is the headquarter of the Kalna subdivision, situated on the western bank of the Bhāgirathi river. The town is more popularly known as Ambika Kalna, named after the goddess Kali, Maa Ambika. It has numerous historical monuments, such as the Rajbari, and 108 Shiva temples. The city of Kalna is 60 kilometres (37 mi) from Bardhaman.

Purba Bardhaman district is in the Indian state of West Bengal. Its headquarters is in Bardhaman. It was formed on 7 April 2017 after the division of the previous Bardhaman district. Great revolutionary Rash Behari Bose was born in village Subaldaha in the district of Purba Bardhaman.