MSLP may refer to:
- mean sea level pressure
- Cuscatlan International Airport (for which it is the ICAO airport code)
- the degree of Master of Speech-Language Pathology
- the Mississippi branch of the Libertarian Party (United States)
- MusclePharm
- Minority Student Leadership Program, a leadership development program of the American Speech-Language-Hearing Association
mSLP may refer to: