King's Highway 24, commonly referred to as Highway 24, is a highway in the Canadian province of Ontario that currently begins at Highway 3 in Simcoe, and ends at the southern city limits of Cambridge. Highway 24 runs in a north/south direction and has been in service since 1927. Before 1997, when many major highways were declassified, Highway 24 began south of Simcoe in Norfolk near Walshingham, and ended in Collingwood, as part of Hurontario Street.