Banner Health is a nonprofit health system in the United States, based in Phoenix, Arizona. It operates 33 hospitals and several specialized facilities across 6 states. The health system is the largest employer in Arizona and one of the largest in the United States with over 55,000 employees.

The organization provides emergency and hospital care, hospice, long-term/home care, outpatient surgery, labs, rehabilitation services, pharmacies, and primary care. In 2024, it reports $14.1 billion in revenue for the previous year.

Banner Health was created in 1999 through a merger between Lutheran Health Systems, based in North Dakota, and Samaritan Health System, based in Phoenix, Arizona. In 2001, Banner sold its operations in Iowa, Kansas, Minnesota, New Mexico, North Dakota and South Dakota, and made its sole headquarters in Phoenix.

Banner also operates a Medicare Advantage insurance plan in the valley referred to as Banner Medicare Advantage and an AHCCCS (Medicaid) plan referred to as Banner University Family Care. Banner operates a joint venture with Aetna, Banner | Aetna, that provides employer-based insurance and marketplace insurance.

Banner Health has partnered with the University of Texas MD Anderson Cancer Center, one of the original three comprehensive cancer centers in the United States established by the National Cancer Act of 1971, and built a $90 million cancer center in Gilbert, Arizona.

In 1999, two nonprofit entities Samaritan Health System (dating back to 1911) and Lutheran Health Systems (history dating back to 1938) merged, forming Banner Health. At the time the entity operated in 14 states and had around 22,000 employees.

In 2007, Banner closed the former Mesa Lutheran hospital and later converted it to office space at a cost of around $100 million.

In 2006 Banner Health launched a telemedicine program. The health system determined the telemonitoring saved 34,000 ICU days and close to 2,000 lives in 2013 based on APACHE II predicted length of stay and mortality rates.