KMCZ may refer to:

• Martin County Airport (ICAO code KMCZ)
• KMCZ (FM), a defunct radio station (107.1 FM) formerly licensed to serve Cameron, Louisiana, United States

• Hadji Ilbeg
• Hadjinasios
• Hadj Mohamed Dahou
• Hadj Mohammed Mesfewi
• Hadjé Halimé
• Hadlai
• Hadland, Sarah
• Hadlee, Richard
• Hadleigh Ford
• Hadleuski
• Hadley-Apennine (Moon)
• Hadley Belle Miller
• Hadley Caliman (album)
• Hadley, Charles
• Hadley, David
• Hadley Falls Dam
• Hadley, George
• Hadley Hinds
• Hadley, James
• Hadley, John
• Hadley-Ludwick House
• Hadley (Martian crater)
• Hadley, Missouri
• Hadley, Pennsylvania
• Hadley, Peter