XSP may refer to:
- XSP (software), an ASP.NET server
- eXtensible Server Pages, a language in Apache Cocoon
- The IATA airport code of Seletar Airport
- Cross-site printing (XSP)
- eXtended Stochastic Probes, A language for State-Aware Performance Analysis
- Xi Sigma Pi, an honorary forestry fraternity for high scholastic achievement in graduate level studies.
The generic term "xSP" may also refer to many different types of service providers -- application, Internet, storage, and management-- to name just a few.