Security-Widefield is a census-designated place (CDP) comprising the unincorporated communities of Security and Widefield located in and governed by El Paso County, Colorado, United States. The CDP is a part of the Colorado Springs, CO Metropolitan Statistical Area. The population of the Security-Widefield CDP was 38,639 at the United States Census 2020. El Paso County governs the unincorporated communities. Both the Colorado Springs post office and the Fountain post office serve the area.

El Paso County is the most populous county located in the American state of Colorado. As of the 2020 Census, the population was 730,395, surpassing the City and County of Denver. The county seat is Colorado Springs, the second most populous city in Colorado. El Paso County is included in the Colorado Springs, Colorado, Metropolitan Statistical Area.