In business

• Manufacturing Execution Systems, the intermediary between a business system such as ERP and a manufacturer's plant floor control equipment
• Marconi Electronic Systems
  Marconi Electronic Systems
  Marconi Electronic Systems , or GEC-Marconi as it was until 1998, was the defence arm of The General Electric Company . It was demerged from GEC and acquired by British Aerospace on November 30, 1999 to form BAE Systems...
  
  , a defunct company of the United Kingdom
• Minimum efficient scale
  Minimum Efficient Scale
  Minimum efficient scale or efficient scale of production is a term used in industrial organization to denote the smallest output that a plant can produce such that its long run average costs are minimized.-Computing:...
  
  , term used in industrial organization to denote the smallest output that a plant (or firm) can produce such that its long run average costs are minimized

In education

• Modern Education Schools
  Modern Education Schools
  The Modern Education School is a private school in Katameya, a suburb of Cairo.The Modern Education Schools, established in 1997, is a co-educational school that is divided into three educational systems which serve grades from pre-kindergarten through high school.The school has an enrollment of...
  
  , an international language school located in Cairo, Egypt
• Muslim Educational Society
  Muslim Educational Society
  The Muslim Educational Society is an organisation established to aid education of Muslims in India, especially in the state of Kerala.-History:The MES was founded in 1964 at Kozhikode by Dr. P. K. Abdul Gafoor. Gafoor's son P. A...
  
  , an educational institution in Kerala state of India
• MES Pattambi
  MES Pattambi
  MES Pattambi is an English medium private high school in Pattambi, Kerala, India. It is a CBSE affiliated school that is run by the Muslim Educational Society. The school, that was established in 1978, is located on a site. The current Principal of the school is Asha Byju. Further it is an ISO...
  
  , a senior secondary school in Kerala; under the Muslim Educational Society Kerala

In computing

• Manufacturing Execution System
• MES-1 to MES-3 - Multilingual European Subsets of Unicode, two sets of glyphs ("characters") that satisfy the requirements of most of the Languages of Europe

In medicine and biology

• Musical ear syndrome
  Musical ear syndrome
  Musical ear syndrome describes a condition seen in people who have hearing loss and subsequently develop auditory hallucinations. It is comparable to Charles Bonnet syndrome and some have suggested this phenomenon could be included under this diagnosis.The occurrence of MES has been suggested to...
  
  
• Modern evolutionary synthesis
  Modern evolutionary synthesis
  The modern evolutionary synthesis is a union of ideas from several biological specialties which provides a widely accepted account of evolution...
  
  , the current paradigm in evolutionary biology
• MES (buffer)
  MES (buffer)
  MES is the common name for the compound 2-ethanesulfonic acid. Its chemical structure contains a morpholine ring. It has a molecular weight of 195.2 and the chemical formula is C6H13NO4S...
  
  , 2-(N-morpholino)ethanesulfonic acid as a buffering agent in biology and biochemistry

Other

• Marine Evacuation System
  Marine evacuation system
  A Marine Evacuation Systems is a lifesaving device found on many modern passenger ships consisting of an inflatable slide or chute where passenger can evacuate straight into waiting life rafts....
  
  , lifesaving apparatus fitted to ships
• Members Equity Stadium
  Members Equity Stadium
  Perth Oval, known by its sponsored name nib Stadium since July 2010, is a sports stadium in Perth, Western Australia. It has been the home of A-League club Perth Glory since 1996 and has housed the administrative facilities of the Western Australia Rugby League since 2003...
  
  , a football stadium in Perth, Western Australia
• A preposition (més) in the Catalan language
  Catalan language
  Catalan is a Romance language, the national and only official language of Andorra and a co-official language in the Spanish autonomous communities of Catalonia, the Balearic Islands and Valencian Community, where it is known as Valencian , as well as in the city of Alghero, on the Italian island...
  
   meaning 'more'
• Mark E. Smith
  Mark E. Smith
  Mark Edward Smith is the lead singer, lyricist, frontman, and only constant member of the English post-punk band The Fall.-Early life:...
  
  , musician in The Fall
• The ICAO airline identifier for Mesaba Airlines
  Mesaba Airlines
  Mesaba Airlines is an American regional airline based in Eagan, Minnesota. The airline operates under Mesaba Aviation, Inc. a wholly owned subsidiary of Pinnacle Airlines Corporation...
  
  
• MES
  Polonia International Airport
  Polonia International Airport is located in the city of Medan, Indonesia, about 5 km from the Central Business District. It is the first international airport in Medan, the other being the planned Kuala Namu International Airport...
  
  , IATA Code for Medan-Polonia International Airport serving Medan, Indonesia
• Minimum Efficient Scale
  Minimum Efficient Scale
  Minimum efficient scale or efficient scale of production is a term used in industrial organization to denote the smallest output that a plant can produce such that its long run average costs are minimized.-Computing:...
  
  , an economic concept to denote efficient firm size