PFO
Appearance
PFO may refer to:
- Patent foramen ovale - a blood-flow pathway between a human heart's atriums, normally naturally closed after birth
- Personal Freedom Outreach - an Evangelical organization opposing cults
- Pittsburgh Film Office
- IATA code for Paphos International Airport
- Pathfinder Roleplaying Game - online version
- Persistent Felony Offender - a defendant accused under a three-strikes law
- Hong Kong's Public Finance Ordinance.