Communication

• .oma, extension for files encrypted by OpenMG Audio for Sony's ATRAC3 format
• OMA, Open Mobile Alliance
  Open Mobile Alliance
  The Open Mobile Alliance is a standards body which develops open standards for the mobile phone industry.- Principles :Mission: To provide interoperable service enablers working across countries, operators and mobile terminals....
  
  , a standards body for the mobile phone industry
• OMA, Outlook Mobile Access, a mobile phone email program using Microsoft Exchange Server
  Microsoft Exchange Server
  Microsoft Exchange Server is the server side of a client–server, collaborative application product developed by Microsoft. It is part of the Microsoft Servers line of server products and is used by enterprises using Microsoft infrastructure products...
  
  
• OMA (time signal)
  OMA (time signal)
  OMA was the callsign of a Czech time signal station. The station was operated by the Astronomical Institute of Prague and the transmitters were located at RKS Liblice 1....
  
  , a former Czech longwave call sign
• OMA, Optical modulation amplitude, an optical communication term

Entertainment

• OMA, One Man Army, a California punk rock band formed in 1996
• Oma Desala, a character in the television series Stargate SG-1
• Oma Ichimura
  Oma Ichimura
  is a Japanese voice actor who works for Office CHK.-Notable voice roles:*Yukiko Hirohara in 11eyes*Poyomon in Digimon Adventure 02*Satomi Arimoto in Fruits Basket*Uribo in Himawari!*Sakuya in Izumo: Takeki Tsurugi no Senki...
  
   (born 1977), a Japanese voice actor
• The OMA Awards created by MTV
  MTV
  MTV, formerly an initialism of Music Television, is an American network based in New York City that launched on August 1, 1981. The original purpose of the channel was to play music videos guided by on-air hosts known as VJs....
  
   at the beginning of March.
• OMA, Only Men Aloud, young Welsh male voice choir.

Medicine

• OMA, Ontario Medical Association
  Ontario Medical Association
  The Ontario Medical Association is a professional organization for physicians in Ontario, Canada founded in 1880. It represents and, to a certain degree, governs approximately 24,000 physicians in Ontario. The association's main office is located at 150 Bloor St. West in Toronto. The current...
  
  , a professional organization for physicians in Ontario, Canada
• OMA, Opsoclonus Myoclonus Ataxia, a neurological disorder better known as Opsoclonus myoclonus syndrome
  Opsoclonus myoclonus syndrome
  Opsoclonus Myoclonus Syndrome is a rare neurological disorder of unknown causes which appears to be the result of an autoimmune process involving the nervous system. It is an extremely rare condition, affecting as few as 1 in 10,000,000 people per year. It affects 2 to 3% of children with...
  
  
• OMA, Optimising Management of Angina
  Optimising Management of Angina
  Coronary heart disease , predominantly due to myocardial infarction , is the number one cause of death in the United Kingdom . However, one of its most common initial manifestations, angina, remains as of yet understudied and its burden may be underappreciated...
  
  , cluster randomized controlled trial of a multi-faceted decision support and educational intervention within chest pain clinics

Engineering

• OMA, Operational Modal Analysis (also Output-Only Modal Analysis), is a branch of Experimental Modal Analysis (see Modal analysis
  Modal analysis
  Modal analysis is the study of the dynamic properties of structures under vibrational excitation.Modal analysis is the field of measuring and analysing the dynamic response of structures and or fluids when excited by an input...
  
   and Modal testing
  Modal testing
  Modal testing is a form of vibration testing of an object whereby the natural frequencies, modal masses, modal damping ratios and mode shapes of the object under test are determined.A modal test consists of an acquisition phase and an analysis phase...
  
  ), in which the modal identification is performed only through the outputs and under the assumption that the input is white noise.

Transportation

• OMA, IATA airport code for Eppley Airfield
  Eppley Airfield
  Eppley Airfield is a medium hub primary airport located three miles northeast of the central business district of Omaha, a city in Douglas County, Nebraska, United States. It is the largest airport in the state of Nebraska...
  
  , Omaha, Nebraska
• OMA, station code for Omaha (Amtrak station)
  Omaha (Amtrak station)
  The Omaha Amtrak station is a train station in Omaha, Nebraska, United States served by Amtrak, the national railroad passenger system. It is served daily by the California Zephyr....
  
  

Other uses

• OMA, Open Mashup Alliance
  Open Mashup Alliance
  The Open Mashup Alliance is a non-profit consortium that promotes the adoption of mashup solutions in the enterprise through the evolution of enterprise mashup standards like EMML. Enterprise mashup usage is expected to grow tenfold in the next five years...
  
  , an industry group for enterprise mashups
• OMA, Office for Metropolitan Architecture
  Office for Metropolitan Architecture
  OMA , is a Rotterdam based architecture firm of Dutch architect Rem Koolhaas.The firm was founded in 1975 by Rem Koolhaas and Elia Zenghelis with Madelon Vriesendorp and Zoe Zenghelis.-History:...
  
  , architecture firm found by Dutch architect Rem Koolhaas
• OMA, Orthologous MAtrix
  Orthologous MAtrix
  OMA is a database of orthologs extracted from available complete genomes.The orthology predictions of OMA are available in several forms:* OMA Pairs: for a given gene, a list of predicted orthologs in other species is provided....
  
  , a database of orthologous genes across multiple species
  Species
  In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...
  
  .
• Oklahoma Military Academy, now Rogers State University
  Rogers State University
  Rogers State University is a public, co-educational university located in Claremore, Oklahoma with branch campuses in Bartlesville, Oklahoma and Pryor Creek, Oklahoma. Since it began offering bachelor's degrees in 2000, it has outpaced the growth of all other public universities in Oklahoma...
  
   in Claremore, Oklahoma
• Grupo Aeroportuario Centro Norte, an airport operating company
• OMA, Oil-Mineral-Aggregates
• Oma, short form for the German word Großmama or Großmutter (grandmother, granny)