The Riverside County Transportation Commission (RCTC) is the County Transportation Commission for Riverside County, California, United States. It is an association of local governments in the county, with policy makers consisting of mayors, councilmembers, and county supervisors, and is the funding agency for the county's transit systems, which include Corona Cruiser, Riverside Transit Agency, SunLine Transit Agency, Pass Transit Agency and Palo Verde Valley Transit Agency. It also provides funds for city transit in Corona and Riverside^{[citation needed]} and is one of Metrolink's five governing agencies. It is additionally the planning agency for the Coachella Valley–San Gorgonio Pass Rail Corridor Service.

RCTC is also a member of Southern California Association of Governments.

Since 2021, RCTC has been the managing agency for the Western Riverside County Regional Conservation Authority