See also: Appendix:Variations of "mo"
- Missouri, a state of the United States of America.
- Moderate Intellectual Disability, a disability often requiring special education services.
- (stock symbol) Altria Group
- modus operandi
- (banking) money order
- (military) medical officer (British army)
- (dentistry) Initialism of mesio occlusal.
- (chemistry) Initialism of molecular orbital.
- (Judaism) Modern Orthodox