The numbered roads in Kawartha Lakes account for 907.3 kilometres (563.8 mi) of roads in the Canadian province of Ontario. These roads include King's Highways that are signed and maintained by the province, as well as the city roads under the jurisdiction of the city. The third type of existing roadway in the single-tier municipality of Kawartha Lakes is locally maintained roads also called concession roads and sidelines, which are beyond the scope of this article. A fourth category of roads, secondary highways, have not existed within the region since 1998.
The 49 numbered highways provide year-round access to the mostly rural municipality. The longest of these roads is Highway 35, which stretches 86.7 kilometres (53.9 mi) across the municipality from the south to the north. The shortest numbered road is Kawartha Lakes Road 3, Hartley Road, a causeway just less than a kilometre long crossing Mitchell Lake.
Before 1998, several additional King's Highways and secondary highways were located in what was then known as Victoria County. These were transferred to the county in 1998. All county roads, including the former provincial highways, were renamed when Victoria County was abolished in 2001 and replaced with the City of Kawartha Lakes.
There are 168.0 kilometres (104.4 mi) of provincially maintained highways, termed "provincial highways" or "King's Highways" (a term adopted in 1930).
As in the rest of Ontario, the provincially maintained highways in Kawartha Lakes are designated with a shield-shaped sign topped with a crown. The highway number is in the centre, with the word ONTARIO below. These signs are known as shields, but may be referred to as reassurance markers.Highway 7, which is part of the Trans-Canada Highway, is also marked with a green maple leaf shield. Highways 7 and 35 together measure 140.0 km (87.0 mi) and account for 82.3% of the length of highways. The remaining 30.2 km (18.8 mi) comprises Highway 115, a controlled-access freeway in the southern corner of the city; Highway 7A, an alternate route to Highway 7 around the Lindsay area; and Highway 7B, a business route through Lindsay.