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:

• Mesh-enhanced Service Location Protocol