MSA可能指：
組織或企業
*馬來西亞-新加坡航空：新加坡航空及馬來西亞航空的前身。
*交通運輸部海事局（China Maritime Safety Administration）
*海上保安廳（舊稱Maritime Safety Agency，今稱Japan Coast Guard）
*, aka the Pakistan Coast Guard
*Masonic Service Association, a Freemasonry publishing resource
*, a society for the promotion of microscopy
*, a manufacturer of industrial safety clothing and equipment
*, an organization for the advancement of mineralogy
*Motion Sensing Alliance, an alliance for the development of motion sensing technology
*, the governing body for motorsport in the United Kingdom
*Mutual Security Agency, established by the US (1951), and distributed aid to Europe after the Marshall Plan
*, a society promoting the study of fungi
教育
學位
- Master of Accountancy, an accounting degree
- , a degree providing preparation for administrative positions
學校
- , an architecture school in Glasgow, Scotland
- , an architecture school in Manchester, England
- Maryland School of the Arts, a fictional dance school in the film Step Up
- , an evaluation and accreditation association
- , a school in Minnesota
- , a high school in Brookhaven, Mississippi
- , a summer program at the University of Missouri
- , a culinary arts institute in Istanbul, Turkey
- , a university in October City, Egypt
- , the student government association of Monash University, Melbourne, Australia
- , a group dedicated to Islamic societies on college campuses in Canada and the United States
科學及醫學
- 5-甲氧基水杨酸（5-Methoxysalicylic acid）：一种化合物，在MALDI质谱中用作基质。
- 甘露醇鹽瓊脂（Mannitol salt agar）：一種微生物培養基。
- , the analysis of the process of obtaining measurements
- 甲基磺酸（Methanesulfonic acid）
- , a period of African prehistory
- 多重序列比對（Multiple sequence alignment）是對三個以上的生物學序列，如蛋白質序列、DNA序列或RNA序列所作的序列比對。
- , a degenerative neurological disorder
- Multiscale approximation 或多解析度分析（multiresolution analysis）
- (linguistics)
- , a quality criterion for a correlation matrix as prequisition for factor analysis (statistics)
科技
- , the primary storage device for some data centres
- , a computer program used when sending email
- , a master agreement defining services to be delivered
- Microsoft Access：一種資料庫管理系統
- , a combination of Java ME extensions
- MSA，MIPS SIMD 架构
- , an agreement between multiple manufacturers to make products which are compatible across vendors
運輸
- MSA , a steam engine class of the Western Australian Government Railways
- 公路服務區（Motorway service area）
- , an airport at Muskrat Dam, Ontario, Canada (IATA code)
其他
- 馬來語（Malay language）
*, a licensing contract between local authorities in the United Kingdom and suppliers of geographic data
- , 2009 United States federal hate-crime legislation
*, an indoor arena in Indianapolis, Indiana demolished in 2001
*, a tax-deferred deposit account for medical expenses
*都会统计区, a geographical area associated with an urban area of 50,000 people or more, as defined by the United States Office of Management and Budget
*, a geographical area associated with an urban area of 10,000 to 49,999 people, as defined by the United States Office of Management and Budget
*, used for safely navigating aircraft over terrain or large structures
*現代標準阿拉伯語（Modern Standard Arabic）
*, an agreement reached between U.S. States and major tobacco companies
MSA Kyotei*, a Japanese abbreviation in reference to .
- Minesweeper Auxiliary
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