ISP may refer to:

In business:

• Internet Service Provider, an organization that offers users access to the Internet and related services
• Integrated Service Provider, a for-hire firm that performs a variety of logistics service activities
• Institute of Sales Promotion, a UK organisation
• ISP Sports, a marketing company which operates several college sports radio broadcast networks

In computer science:

• ISP Formal Verification Tool, an "In-situ Partial Order" verification tool for MPI (Message Passing Interface) programs
• In-System Programming, a way to configure programmable logic devices while they are installed in a larger system

In education:

• Instituto Superior Politécnico, a university in São Tomé and Príncipe
• Integrated science program, an honors program at Northwestern University
• Yale Information Society Project at Yale Law School
• Information Systems Professional, an information technology title and post-nominal
• International School of Paris, a private school in Paris, France

In law enforcement:

• Illinois State Police, law enforcement agencies across Illinois
• Indiana State Police, law enforcement agency of Indiana
• Iowa State Police, law enforcement agency of Iowa

In physics:

• Invariant set postulate, the only postulate joining fractal cosmology with quantum mechanics
• Specific impulse, represented by I_sp, a term used to describe rocket thrust

Other uses:

• Islip/Long Island MacArthur Airport, IATA Airport Code ISP
• Islip railway station, England, Network Rail station code ISP
• Independent Socialist Party, in several countries
• Invisibl Skratch Piklz, a group of turntable artists in the early 1990s
• Independent study project

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