P3 can refer to many things

• position 3 in a race
• Intel 3rd generation processor design, or 386, i386, 80386
  • 386 DX
  • 386 SX
• Intel Pentium !!!, a 6th generation processor design
• Public Private Partnership, a way of funding public works projects through partnerships with private industry.
• Period 3 of the periodic table
• Radio stations in the Nordic countries
  • Denmark: DR P3
  • Norway: NRK P3
  • Sweden: SR P3

See also

• P2
• P4