KMJC may mean:
KMJC 620 in Mount Shasta, California previously KECR AM 910 El Cajon, California now KMXG FM 96.1 Clinton, Iowa, formerly KMJC-FM starting 1989 November 24 or 1990 May 14 now KKLC FM 107.9 in Mount Shasta, California, former KMJC-FM starting 1995 November 1 Koninklijke Marine Jachtclub (Royal Navy Yacht Club) of the Royal Netherlands Navy