Nine members of two families were going to a temple in a private car when it collided with the truck at around 6 AM, police said.
"The victims were residents of Rajkot and were going to Ghoghaji Maharaj temple for darshan," Viramgam police sub-inspector J D Zala said.
"They were travelling in a car which collided with the speeding truck coming from opposite direction killing eight persons on the spot," he said.
The deceased were identified as Ashok Lalji, Kalu Gamara, Shailesh Gamara, Labuben Gamara, Pushpa Jetiya, Girish Jetiya, Kanekshwari Jetiya and Vibhaben Jetiya.
"A complaint has been lodged against the truck driver and further investigation is on," the SI added.