MA is an abbreviation and Ma may be either an abbreviation or a word, each of which may refer to:

in academia:

• Master of Arts (postgraduate) (MA), academic degree
• Master of Arts (Oxbridge and Dublin) (MA), degree given by universities of Oxford, Cambridge and Dublin to their bachelor's graduates
• Master of Arts (Scotland) (MA), academic degree in Scotland
• Marin Academy (MA), high school in San Rafael, California
• Minnehaha Academy (MA), private high school in Minneapolis, Minnesota
• Museums Association (MA), UK

in science and technology:

• .ma, the Internet country code top-level domain (ccTLD) for Morocco
• Mach number (Ma), a measure of speed compared to the speed of sound
• Megaannum (Ma), one million (1,000,000) years
• Mechanical advantage (MA), mechanical multiplier of input force
• Medical assistant (MA), a type of health care worker
• Methyl anthranilate (MA), a bird repellent
• Moving average model (MA(q)), statistics
• International Symposium on Mobile Agents (MA), a computer networking conference
• a set of decision problems (MA) that can be decided by an Arthur-Merlin protocol
• a type of interface (Ma) in an IP Multimedia Subsystem

in geography:

• Ma River, river in Asia, running through Vietnam and Laos
• Madagascar (MA), FIPS 10-4 country code
• Maranhão (BR-MA), part of the ISO 3166-2:BR geocode for the Brazilian state
• Massachusetts (MA), United States postal abbreviations for the state
• Meshwesh (Ma), an ancient Libyan (i.e., Berber) tribe from Cyrenaica
• Metropolitan area (MA), a qualifying term, e.g. "Tokyo MA"
• Morocco (MA), ISO 3166 country code

in myth and culture:

• Ma people, a Vietnamese ethnic group
• Ma (Lion King), a main character in the animated film Lion King 1½
• Ma (myth), in Sumerian mythology that from which the "primeval land" was formed
• Ma (surname), a common Chinese family name
• "MA15+", an Australian film and video game classification meaning "Not suitable for under 15s"
• Memory Alpha (MA), a Star Trek-oriented wiki
• Encyclopaedia Metallum: The Metal Archives (MA), a website devoted to heavy metal bands
• Maria (Mª or Ma.), according to Spanish naming customs

in other uses:

• Mother, "Ma" used as a synonym
• Ma (negative space), a word of Japanese origin used in art and design
• Marijuana Anonymous (MA), a group recovery program aimed at marijuana addiction
• Martial arts (MA), only used in combining forms such as MMA or MCMAP
• Malév Hungarian Airlines (MA), IATA airline designator
• MasterCard, NYSE stock symbol