The Qasba Mosque (Bengali: কসবা মসজিদ, Arabic: مسجد القصبة) is an early 16th-century mosque and archaeological site located in Gournadi, in the Barisal District of Bangladesh.

The village of Qasba was an important center in the Sultanate of Bengal and was home to several influential Muslim families.

[2] The mosque was constructed in the early 16th century, during the reign of Alauddin Husain Shah.

The earlier Nine Dome Mosque built by Khan Jahan Ali in Khalifatabad is considered to be its inspiration due to the striking similarities.

In active use, the mosque is a protected monument by Bangladeshi Department of Archaeology.