China 
Africa 
- Processed meat
- Processing delay
- Processivity
- Processor
- Processor affinity
- Processor design
- Processor register
- Processor sharing
- Prochiral
- Proctor compaction test
- Procurement
- Procyanidin
- Procymidone
- Prodigiosin
- Prodromal
- Prodrugs
- Produced water
- Producer gas
- Producer price index
- Product analysis
- Product category
- Product certification
- Product defect
- Product development
- Product differentiation
- Product inhibition
- Product layout
- Product lifecycle
- Product lifetime
- Product order
- Product requirements document
- Product rule
- Product topology
- Product-form solution
- Production
- Production blocking
- Production control
- Production engineering
- Production flow analysis
- Production fluid
- Production function
- Production leveling
- Production line
- Production orders
- Production rules
- Production set
- Production system
- Production tubing
- Productive capacity
- Productive efficiency
- Productivism
- Productivity
- Productivity model
- Productivity software
- Profibus
- Profile angle
- Profiling
- Profilograph
- Profilometer
- Profinet
- Profisafe
- Progenitor cells
- Progesterone
- Progesterone receptor
- Progestogen
- Proglacial lakes
- Prognosis
- Prognostics
- Progradation
- Program Evaluation and Review Technique
- Program analysis
- Program comprehension
- Program counter
- Program dependence graph
- Program evaluation
- Program transformation
- Programmable calculator
- Programmable thermostat
- Programmable-gain amplifier
- Programmed cell death
- Programmed cell death protein 1
- Programming by demonstration
- Programming language
- Programming model
- Programming paradigm
- Programming style
- Progress bars
- Progress indicators
- Progressing cavity pumps
- Progressive cavity pumps
- Progressive collapse
- Progressive disclosure
- Progressive disease
- Progressive meshes
- Progressive stamping
- Progressive supranuclear palsy
- Proinflammatory cytokines
- Proinsulin
- Project
- Project Tango
- Project appraisal
- Project complexity
- Project cost management
- Project delivery method
- Project finance
- Project manager
- Project portfolio management
- ProjectWise
- Projected coordinate system
- Projectile motion
- Projectiles
- Projection
- Projection matrix
- Projection method
- Projection onto convex sets
- Projection plane
- Projection pursuit
- Projection screen
- Projection-slice theorem
- Projective geometry
- Projective line
- Projective plane
- Projective space
- Projective transformation
- Projector
- Prokaryotes
- Prolactin
- Prolactinoma
- Prolapse
- Proliferative vitreoretinopathy
- Prolog
- Prolotherapy
- Prolyl hydroxylase
- Promela
- Promenades
- Promethazine
- Promethee
- Promethium-147
- Promiscuous mode
- Promoter
- Promoter activity
- Promoters
- Prompt neutrons
- Promyelocytes
- Pronase
- Pronation
- Pronator teres muscle
- Prone
- Prone position
- Prony brake