- Mafia
- Magnet schools
- Mahjong
- Mail fraud
- Malaria
- Managed care
- Management styles
- Manatees
- Marathons
- Mardi Gras
- Marines
- Marriage customs
- Mars
- Martial arts
- Mass transportation
- Massage
- Matchmaking
- Media violence
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- Meditation
- Megan's Law
- Mennonites
- Mental illness
- Meteorology
- Midwifery
- Migrant workers
- Minimum wage
- Mining
- Mold
- Montessori schools
- Mormonism
- Mountain climbing
- Movie-rating system
- Muhammad
- Multiple births (twins, triplets, etc.)
- Multiple sclerosis
- Music therapy
- Myspace
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