Bettna is a locality situated in Flen Municipality,[3] Södermanland County, Sweden with 412 inhabitants in 2010.

The boundary goes a few hundred metres from the village entrance by national road 52.

The topography around the village is generally flat with occasional rolling hills and little elevation is covered when travelling to either of the three nearby municipal centres.

Its organ was approved by the Swedish king Gustaf III shortly before his assassination in 1792.

The Swedish post-impressionist painter Nils von Dardel was born in Bettna in 1888.