OPP say two people are dead following a two-vehicle collision in Muskoka Lakes township near Bracebridge.
It happened sometime before 4:30 p.m. on Saturday. Police say the accident happened on Peninsula Road.
Officials say the driver and passenger of one vehicle, 49 year-old David Lash and 76 year-old Anthony Lash, both from Toronto, were pronounced dead on scene.
A 13-year-old girl was airlifted to a hospital in Toronto, being treated for non-life threatening injuries.
The driver of the other vehicle also suffered minor injuries.
Officers are still investigating the cause of the crash.