PBO may refer to:

Government

• Parliamentary Budget Office, in the federal government of Australia
• Parliamentary Budget Officer, a Canadian civil servant
• Projected benefit obligation, a specially defined pension obligation under US-GAAP

Sciences

• Lead(II) oxide (PbO)
• Zylon, or Polybenzobisoxazole, a polymer
• Piperonyl butoxide, a pesticide synergist

Places

• Peterborough railway station (National Rail code: PBO)
• Paraburdoo Airport, Paraburdoo, Australia (IATA airport code: PBO)
• Pine Bluff Observatory, an astronomical observatory in Wisconsin, USA
• Plate Boundary Observatory, a geodetic observatory in the western United States
• Portland Bird Observatory, a wildlife observatory on the Isle of Portland, in Dorset, UK

Programming

• Pixel buffer objects, used for asynchronous pixel transfer operations in OpenGL

People

• Push Button Objects, a producer of experimental hip-hop
• President Barack Obama, former president of the United States

Video games

• Packed Bohemia Object, a data file used in the war games developed by Bohemia Interactive Studio

Computing

• Precision Boost Overdrive, a technology by AMD for processor overclocking

Other uses

• Pinoy Box Office, a Filipino cable channel
• Public Benefit Organization, a type of charity or non-profit organization
• Paperback original, a book originally published as paperback
• Pin Bones Out, a type of fish fillet
• Philharmonia Baroque Orchestra