OPP say there were ten traffic and water-related deaths over the Labour Day weekend.
Two motorcyclists were amoung the four people killed in separate collisions and one person died in an off-road vehicle crash.
Two were killed in boating accidents and three people drowned in OPP-patrolled waters.
The long weekend is also when OPP conduct their distracted driving campaign.
They say they issued a total of 651 distracted driving charges.
Overall, officers laid 10,403 charges throughout the province.
The most common charges were for speeding and stunt driving.