PFI

PFI may stand for:
 * Pay for inclusion (paid inclusion), charge by a search engine to include a Web site in its index
 * Pellet Fuels Institute, trade association of the wood pellet fuel industry
 * Percy FitzPatrick Institute of African Ornithology
 * Performance Freediving International, a freediving organization
 * Popular Front of India, an Islamist organisation in India
 * Port fuel injection (indirect injection), a type of fuel injection used in automobiles
 * Practical Farmers of Iowa, an agriculture NGO in Iowa
 * Pre-flight inspection, of an aircraft
 * Private finance initiative, a way of funding public sector projects with private capital
 * The Prize Fighter Inferno, a musical project of Coheed and Cambria frontman Claudio Sanchez
 * Pro forma invoice, a billing document that is not a demand for payment but gives information about a shipment
 * PFI Convention (Convention on the protection of the European Communities' financial interests), a multilateral EU treaty on fraud
 * Perspektivnyi Frontovoy Istrebitel ("Perspective Frontline Fighter"), Soviet military aircraft; see Post-PFI Soviet/Russian aircraft projects
 * PFIs, or Pharmaceutical Formulation Intermediates, a pharmaceutical term
 * Press Freedom Index