SPF

SPF may refer to:

In science

• Sun protection factor, a laboratory measure of the effectiveness of sunscreen
• Specific Pathogen Free, a term for laboratory animals known to be without pathogens
• S-phase fraction, a measure of proliferative activity in oncology
• Superplastic forming, a metalworking process for forming sheet metal
• Supernatant Protein Factor, cytosolic protein known also as SEC14L2, Tap-1 (Tocopherol Associated Protein 1)

In mathematics

• Formal spectrum of a ring, a construction in algebraic geometry

In computing and telecommunications

• Sender Policy Framework, an e-mail anti-forgery system
• Shortest Path First, another name for Dijkstra's algorithm
• Single point of failure in systems
• STEP Physical File, ISO 10303-21 data encoding standard
• Sunbelt Personal Firewall, a desktop personal firewall
• System Productivity Facility, an early version of the ISPF application framework (originally known as Structured Programming Facility)

In government and politics

• Security Policy Framework, an overarching security policy set by UK government
• Special Police Force
• Singapore Police Force
• South Pacific Forum
• Space Power Facility, an experimental vacuum chamber for NASA
• Special Purpose Forces, highly trained and advanced soldiers
• Socialist Party of Florida, an affiliate of the Socialist Party USA
• Servicio Penitenciario Federal, the Argentine federal administration in charge of prisons

In construction

• Spray polyurethane foam
• Spruce-pine-fir, mixed softwood timber

Other uses

• Summer Play Festival