The Queen's Medical Center, originally named and still commonly referred to as Queen's Hospital, is the largest private non-profit hospital in Honolulu, Hawaii. The institution was founded in 1859 by Queen Emma and King Kamehameha IV, and is located in Downtown Honolulu.

Emma Kalanikaumakaʻamano Kaleleonālani Naʻea Rooke was queen of Hawaii as the wife of King Kamehameha IV from 1856 to his death in 1863. She was later a candidate for the throne but King Kalākaua was elected instead.