Colo High School is a government-funded co-educational comprehensive secondary day school, located on the Bells Line of Road in North Richmond, on the north-western outskirts of Sydney, New South Wales, Australia.

Colo High School was established in 1978 in demountable buildings at North Richmond.

Sam Weller, the school's first Deputy Principal, suggested using the school building plan as a basis for the logo.

David Stone, founding Mathematics teacher, drew up the design which was accepted as the school badge.

The shape also represents the Tree Of Knowledge, and its three sections, Students, Staff and the Community.