The El Cajon Police Department (ECPD) is the primary law enforcement agency of El Cajon, California.

It was founded in 1912.

The current police chief is Michael Moulton, who took over for the retiring Chief Jeff Davis on Sept. 13, 2019.

It is a member of the San Diego County–Imperial County Regional Communications System.

The department's Forensic Science Laboratory is accredited by The American Society of Crime Laboratory Directors/Laboratory Accreditation Board (ASCLD/LAB).