The passengers were returning to their native Khanderia Kachria village in Mandsaur district after visiting a temple in neighbouring Rajasthan when their vehicle toppled, Neemuch Superintendent of Police Manoj Kumar Singh told PTI.
The passengers were trapped under the tractor after it overturned, with 11 of them dying as a result.
Among the deceased are four children, six women and a man. Their identities are yet to be established, the SP said.
The injured persons have been referred to Neemuch district hospital, he said.