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HBOHome Box Office (premium movie channel on USA cable systems)
HBOHyperbaric Oxygen
HBOHyperbaric Oxygenation
HBOHollywood Bowl Orchestra (California)
HBOHipparchus Binary Object
HBOHome Box Office
HBOHoger Beroeps Onderwijs
HBOHoney Bunches of Oats (cereal)
HBOHistorische Bildungsforschung Online (German history of education research website)
HBOHelp A Brother Out
HBOHealthy Birth Outcomes ( various organizations)
HBOHumboldt, Nebraska (airport code)
HBOHorrible Body Odor
HBOHandled By Officer (police communications)
HBOHand Baggage Only
HBOHamilton Basketball Association (Recreation League in Canadian City)
HBOHigh Band Operator
HBOHuff, Barrington and Owens