| RBO | Jim Riley, Steve Barnard, and Bob O'Connell 
| Others |
| RBO | Rack Builder Online Survey
| Others |
| RBO | Ragnarok Battle Offline
| Others |
| RBO | Rank Biased Overlap
| Others |
| RBO | Rated Beginners Open
| Others |
| RBO | Real Business Object
| Others |
| RBO | Real Estate By Owner
| Others |
| RBO | Rear Bumper Overlay
| Others |
| RBO | ReBate Offer
| Others |
| RBO | Red Blue Orange
| Others |
| RBO | Red Bluff Outlaws
| Others |
| RBO | Red Buttes Observatory
| Others |
| RBO | RedBox Organizer
| Others |
| RBO | Regional Branch Office
| Others |
| RBO | Regional Business Office
| Others |
| RBO | Regional Business Operation
| Others |
| RBO | Rent By Owner
| Others |
| RBO | Rental Bonds Online
| Others |
| RBO | Replication Business Object
| Others |
| RBO | Reproductive Biology of Orchids
| Others |
| RBO | Resident Beat Officer
| Others |
| RBO | Resolution By Objective
| Others |
| RBO | Retail Banking Officer
| Others |
| RBO | Reverse Boss Order
| Others |
| RBO | Reverse Byte Ordering
| Others |
| RBO | Revolution By Overthrow
| Others |
| RBO | Rib Burn Off
| Others |
| RBO | Rice Bran Oil
| Others |
| RBO | Rich Bobinski Orchestra
| Others |
| RBO | Right Back Outside
| Others |
| RBO | Ring Buffer Object
| Others |
| RBO | Risk Bearing Organization
| Others |
| RBO | River Basin Organization
| Others |
| RBO | River Bottom Outdoors
| Others |
| RBO | Rivers, Bays, and Oceans
| Others |
| RBO | Roanoke, Belmont, & Occidental Railroad
| Others |
| RBO | Robert Brownlee Observatory
| Others |
| RBO | Robore, Bolivia
| Others |
| RBO | Rock et Belles Oreilles
| Others |
| RBO | Rollin' Boulder Outfitters
| Others |
| RBO | Rota Burn Out
| Others |
| RBO | Rule Based Optimizer
| Others |
| RBO | Rule-Based Optimizer
| Others |
| RBO | Running for a Better Oakland
| Others |
| RBO | Russian Brotherhood Organization
| Others |
| RBO | Russian Brotherhood Organization of the United States of America
| Others |
| RBO | Ryan Brennen O'Connor, musician
| Others |