AmerisourceBergen Corporation is an American drug wholesale company that was formed by the merger of Bergen Brunswig and AmeriSource in 2001. They provide drug distribution and consulting related to medical business operations and patient services. They also distribute a line of brand name and generic pharmaceuticals, over-the-counter (OTC) health care products and home health care supplies and equipment to health care providers throughout the United States, including acute care hospitals and health systems, independent and chain retail pharmacies, mail-order facilities, physicians, clinics and other alternate site facilities, as well as nursing and assisted living centers. They also provide pharmaceuticals and pharmacy services to long-term care, workers' compensation and specialty drug patients.

AmerisourceBergen handles about 20% of all of the pharmaceuticals sold and distributed throughout the United States and ranked 10th on the Fortune 500 list for 2020 with over $179 billion in annual revenue. In 2012, the firm was the largest by revenue based in Pennsylvania.

The company has announced its intention to change its name to Cencora, effective in mid-2023.