MHA may refer to:

• Malaysian Highway Authority, a government agency under the Malaysian Ministry of Works
• Malta Handball Association, the governing body of handball in Malta
• Manitoba Hockey Association, an early Canadian ice hockey league
• Member of the House of Assembly, a legislative assembly member in parts of Australia and Canada
• Mandan, Hidatsa, and Arikara Nation, a Northern Plains Native American tribe
• Ministry of home affairs, a government department in some countries
• Mormon History Association, a nonprofit organization promoting research and publication
• Methodist Homes for the Aged, cares for older people and is part of MHA Care Group

• Mast Head Amplifier, an amplifier (LNA) mounted as close as practical to the antenna
• May–Hegglin anomaly, a genetic disorder affecting the blood platelets
• Microangiopathic hemolytic anemia, a type of anemia, more commonly abbreviated MAHA
• Maximum holding airspeed, aviation airspeed for holding patterns
• Minimum holding altitude, an aviation term, see holding

• Master of Health Administration, a degree awarded by many American, European and Australian universities
• Mental Health Act, stock short title used for legislation relating to mental health law
• Mueller–Hinton agar, an agar of beef infusion, peptone, and starch used primarily for antibiotic susceptibility testing
• My Hero Academia, a Japanese manga and anime series