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
- Popular Front of India, a confederation of public-service organizations in India
- Port fuel injection (indirect injection), a type of fuel injection used in automobiles
- Practical Farmers of 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 purchase order that is not a demand for payment but gives information about a shipment
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