Dashmina (Bengali: দশমিনা) is an upazila of Patuakhali District in the Division of Barisal, Bangladesh.

North Border of both Bahrampur and Bashbaria union ends up with starting of Baufal upazila.

Rono Gopaldi and Betagi Shankipur union is situated on the north western part of Dashmina Sadar and finally the Alipura union covers the southern part of this historic Upazila which ends up with starting of Galachipa upazila.

According to the 2011 Census of Bangladesh, Dashmina Upazila had 28,490 households and a population of 123,388.

Dashmina has a literacy rate (age 7 and over) of 48.7%, compared to the national average of 51.8%, and a sex ratio of 1048 females per 1000 males.