Montclair Hospital Medical Center (MHMC) is a 102-bed acute care facility in Montclair, in the Pomona Valley of San Bernardino County, southern California.

MHMC is owned and operated by Prime Healthcare Services, Inc. (PHS), a hospital management company located in Ontario.

PHS was founded in 2001 by Prem Reddy, who is its chairman of the board.

MHMC was founded in 1973 as Doctors Hospital- Montclair and operated by National Medical Enterprises, a predecessor of Tenet Healthcare, for several years before being sold in early 1995.

[2] In 2006, AHMC divested MHMC to Prime Healthcare who operates the facility as Montclair Hospital Medical Center.