AdventHealth Shawnee Mission, is a 504-bed hospital in Merriam in Johnson County, Kansas. In addition to the hospital itself it has a free-standing outpatient surgery, a community health education building, five physician office buildings and an associate child care center. The hospital is owned by AdventHealth, a hospital network headquartered in Altamonte Springs, Florida.

In 1955, Shawnee Mission Hospital was founded when local leaders, medical professionals from the Johnson County Medical Society, and members of the New Haven Seventh-day Adventist Church in Overland Park, Kansas, came together to address the developing population's healthcare needs in Johnson County. In 1961, the 102-bed nursing care facility, Pleasantview Health and Vocation Institute opened. This facility formed the foundation of the modern hospital. In May 1962, Shawnee Mission Hospital opened with 65 acute care beds along Interstate 35. In 1966, an additional 70 acute-care beds, as well as more space for expanded diagnostic and therapeutic services were added.

In 1971, Shawnee Mission Hospital was renamed Shawnee Mission Medical Center. In 1972, ownership of the hospital was transferred to the Seventh-day Adventist Church, and it was placed under the direction of the Central (now Mid-America) Union Conference. The bed count at the time was 241, and due to the urgent need for acute care, these beds were converted to acute care beds in January 1975. By 1982, the total number of acute care beds had risen to 383. New maternity, cardiac care, women's services, and outpatient facilities were added in 1991 and 1992. In 1996, Shawnee Mission Medical Center became affiliated with Saint Luke's Health System.

On November 1, 2002, Shawnee Mission Medical Center split from Saint Luke's and became a part of the Altamonte Springs, Florida-based Adventist Health System.

In 2008, construction workers began the construction of a $114 million patient tower that added 265,000-square-feet, it included a new emergency department, cardiac care unit (CCU), intensive care unit (ICU), surgery floor, and main entrance. The emergency room was tripled in size and capacity, and four operating rooms were added. In 2009, the patient tower opened and the last two floors were completed in 2011 for $20 million.

In early December 2011, construction workers began the construction on a 90,000-square-foot birthing center to replace the older birth center on the hospital campus. On February 27, 2013, there was a grand opening of the new Shawnee Mission Birth Center, which tripled the size of the previous birth center. It opened to patients the next day. A 24-bed Level III Neonatal Intensive Care Unit (NICU) with private, single-family rooms was included in the expansion.

On March 12, 2014, Shawnee Mission Medical Center announced that their network of facilities would adopt the name of Shawnee Mission Health. Shawnee Mission Outpatient Pavilion in Lenexa, Kansas, officially became Shawnee Mission Health Prairie Star.

On March 22, 2016, the foundation of Shawnee Mission Health started a philanthropy campaign to raise $15 million for the B.E. Smith Family Center. Doug and Nan Smith were the first to give a grant for the construction of the new family center. On June 7, 2017, a grant of $1 million was donated by the Hall Family Foundation for the new family center. In March 26, 2018, construction workers started construction of the 62,000-square-foot B. E. Smith Family Center on the hospital campus. On August 6, 2018, there was a topping out ceremony for the family center. On April 30, 2019, it was opened to house its Britain Development programs for children with developmental disabilities and Early Learning programs for children of employees at AdventHealth Shawnee Mission. The building is the first in the world to have the Variety KC Compass harness system.

On February 1, 2017, Shawnee Mission Health opened its outpatient pavilion Shawnee Mission Health-Overland Park on the south side of Overland Park, Kansas. Later on October 7, 2021, AdventHealth South Overland Park opened on the site.

In early November 2017, Shawnee Mission Health became the 17th member of MD Anderson Cancer Network. It became the first in Kansas. On January 2, 2019, Shawnee Mission Health rebranded to AdventHealth Shawnee Mission.

On January 1, 2021, the United States government passed a law requiring all hospitals to have their chargemaster on its website. By late August, AdventHealth Shawnee Mission had failed to comply with the new law. It was not until July 28, 2023, that the hospital was in full compliance with the law.

In early 2022, AdventHealth Shawnee Mission began a two phase renovation project to update the original patient tower. The renovations cost over $30 million to renovate patient rooms, employee area, exteriors, waiting areas and lobby elevators. Renovations are expected to be completed in November.

On May 5, 2022, AdventHealth Shawnee Mission announced their plans for a new three-story, 71,000-square-foot cancer center to replace their current cancer center which opened in a medical office building in January 2014. They planned to demolish a two-story parking garage on campus for the new building. And planned for a new parking lot with 229 spaces. In late May, the Merriam City Council approved the plans for the new cancer center by the hospital. The new AdventHealth Cancer Center Shawnee Mission will cost $76.5 million to build and it will double the number of patients being treated. On July 18, demolition of the two-story parking garage began and the official groundbreaking of the cancer center was in October. On June 12, 2023, the AdventHealth Cancer Center Shawnee Mission was halfway completed and will be finished in spring of 2024.

In late November 2017, Shawnee Mission Medical Center received the HIMSS Analytics Stage 7 Award for its electronic health record.

• List of Seventh-day Adventist hospitals

• Official website
• AdventHealth Shawnee Mission Montgomery Advertiser
• AdventHealth Shawnee Mission HospitalCompare
• AdventHealth Shawnee Mission (Shawnee Mission, KS USA Today
• Case Study - AdventHealth Shawnee Mission World Centric
• Ross Chastain Delivers Speedy Bears to Kids at AdventHealth Shawnee Mission Speedway Digest
• AdventHealth holds annual LIV Conference and inspires Kansas Citians to LIV with Purpose Johnson County Post
• AdventHealth builds Sensory Garden at B.E. Smith Family Center Johnson County Post
• Gov. Kelly tours B.E. Smith Family Center in Merriam, which stayed open through pandemic Johnson County Post