Ontario Highway 41

King's Highway 41, commonly referred to as Highway 41, is a provincially maintained highway in the Canadian province of Ontario. The 159.6-kilometre (99.2 mi) highway travels in a predominantly north–south direction across eastern Ontario, from Highway 7 in Kaladar to Highway 148 in Pembroke. The majority of this distance crosses through a rugged forested region known as Mazinaw Country. However, the route enters the agricultural Ottawa Valley near Dacre. A significant portion of Highway 41 follows the historic Addington Colonization Road, built in 1854.

Highway 41 was first assumed in 1935, though ironically the initial route is no longer part of the highway. It was extended north to meet the eastern terminus of Highway 60 at Golden Lake in 1937. The following year, a southern discontinuous section of the highway was established north from Picton in Prince Edward County. A series of changes in 1957 extended Highway 60 east to Renfrew and Highway 41 north to Pembroke; this established a concurrency of the two highways through Eganville, which remains to this day.

At its greatest length, Highway 41 travelled from Highway 2 in Napanee north to Highway 17 and Highway 62 in Pembroke, a distance of 234.5 km (145.7 mi), including the discontinuous southern section. The Prince Edward County section was renumbered as Highway 49 in 1965 in anticipation of the building of the Quinte Skyway, while the original section, between Highway 2 and Highway 7, was transferred to Lennox and Addington County in 1998, and is now County Road 41.