Campsite 423 is a paddle-in backcountry site on Buzzard Lake within Kawartha Highlands Provincial Park in Ontario. Access is by canoe or kayak only, and the site accommodates up to nine people.

The site is widely regarded as one of the nicest on the lake, featuring open rocky areas ideal for sitting, good sightlines to the sky, and excellent morning sun exposure. It is a spacious site suitable for a family-sized group.

A private cottage is situated nearby on the lake, a remnant of land use predating the park. Snapping turtles have been spotted in the area. Being a popular and well-used site, firewood can be scarce, so visitors should plan accordingly.

Reservations are made through Ontario Parks.