Underwriters Laboratories (UL) is a global safety science company, the largest and oldest independent testing laboratory in the United States. Underwriters Laboratories tests the latest products and technologies for safety before they are marketed around the world. It tests 22 billion different products annually, ranging from consumer electronics, alarms and security equipment, to lasers, medical devices, and robotics.

Founded in 1894, Underwriters Laboratories offers its services in five strategic areas, from product safety, environment, life and health, university, and verification services.