"One person died of burn injuries in the incident," Gurgaon Police Commissioner K K Sindhu told PTI.
In a statement, the company said the violence broke out in the evening when a worker beat up a supervisor on the shop floor.
However, the employees union said "objectionable remarks" by the supervisor against an employee triggered the violence.
"Work at the Manesar plant had to be stopped following the violence," the company said.
Labour unrest is not a new phenomenon in Manesar plant which mainly produces Swift. The factory had witnessed three such instances last year causing a total production loss of about 83,000 units.
"Workers at the plant today turned violent, attacking and injuring executives and managers in the office premises. At least 40 managers and executives are injured, and have been rushed to hospital. The attackers also set fire to property and damaged facilities," Maruti said. MORE
The Gorkha Janmukti Morcha (GJM) today opposed the proposed setting up of a police commissionerate in Siliguri sub-division of Darjeeling district.