The District and Sessions Judge, Ram Lakhan Singh convicted the 15 accused for murdering of one Kari Yadav in Ramnagar Mahesh village under Srinagar police station area on March 17, 2000.
The court also imposed Rs 10,000 as fine on each.
According to prosecution, the convicted had hacked Yadav to death with a spade in the wake of land dispute.
The victim's wife Suryamani Devi had named the 15 in an FIR following the murder of her husband.