OMB is a TLA which may stand for:

• observation manipulation bell
• Ocean Modeling Branch - former name of current Marine Modeling and Analysis Branch
• Office of Management and Budget
  • United States Office of Management and Budget
  • (many other govts have an office of this name also)
• Offshore Model Basin
• Old Man Bal from Xenogears
• Olympia Master Builders omb.org
• Olympiade Mathématique Belge
• Ontario Municipal Board
• Opportunity Microfinance Bank
• Oregon Marching Band
• Our Miss Brooks
• Oh my Buddha

OMB Electronic Systems S.A. has operations in Spain and Florida. omb.com

"OMB" or "Omb" may also appear as an abbreviation for ombudsman.