Five men, three women and a child died in the accident, said police.
Superintendent of Police Somnath Gharge said that the accident occurred at around 4.45 AM near Repoli village. The victims, who were all relatives, were travelling in the van to Guhagar town in Ratnagiri district. The victims were residents of Hedvi village in Guhagar.
The truck was going towards Mumbai, he said.
After being alerted, police rushed to the spot and began the rescue operation.
The bodies have been sent to a government hospital for post-mortem.