St. Mary Medical Center (SMMC) is a hospital in Long Beach, California, US.

In December 1983, the emergency department at SMMC was designated as a level I trauma center for adults.

Hegarty, pastor at St. Anthony's, to care for the sick and poor in Long Beach, by purchasing what is now St. Mary Medical Center from Dr. T.O.

The new hospital opened in 1937 and was financed by a Public Works Administration loan.

[5] Catholic Healthcare West (now Dignity Health) acquired St. Mary Medical Center from the Sisters of Charity of the Incarnate Word in 1996.