Residents of Malhharpur village in Ghatampur were going to Muktapur Temple on a tractor when the vehicle suddenly overturned, said SP (Rural) A K Mishra.
All the 38 persons on the tractor, including women, children, were injured, he said.
The driver of the vehicle was also injured.
The SP said 10 of the injured are said to be in a serious condition and have been admitted to a hospital in the city.