Modjeska Canyon is an unincorporated community and census designated place (CDP) on the western slope of the Santa Ana Mountains in eastern Orange County, California. It is a suburban community of several hundred residents, with a small park and a volunteer fire station. The ZIP Code is 92676, and the community is inside area code 714.

Helena Modrzejewska, known professionally as Helena Modjeska, was a Polish actress who specialized in Shakespearean and tragic roles.