OMB

OMB may stand for:

• Marine Modeling and Analysis Branch, formerly Ocean Modeling Branch, a U.S. weather and environment agency
• Office of Management and Budget, a group that oversees the activities of federal agencies in the United States
• Olympiade Mathématique Belge, the Belgian Mathematical Olympiad, a mathematical competition
• OMB, a graphic design studio founded by Oscar Mariné Brandi
• Ontario Municipal Board, a tribunal involved in municipal and planning matters in the province of Ontario, Canada
• OpenMicroBlogging, the standard that allows for micro-blogging services to interoperate
• Oregon Marching Band, the marching band for the University of Oregon in Eugene, Oregon
• Oregon Medical Board, governs the practice of medicine in Oregon
• omb, ISO code for the East Ambae language of Vanuatu