GLP can refer to:
- Gateway location protocol
- German Longhaired Pointer
- Gibraltar Labour Party
- Gibraltar Liberal Party
- Gleichmäßigkeitsprüfung, German for regularity test, a series for street-legal cars held at Nürburgring
- Global Land Project
- Glucagon-like peptide-1 (GLP-1), a gut hormone involved in decreased feed intake and increased insulin secretion
- Glucagon-like peptide-2 (GLP-2), co-secreted with GLP-1, potentially linking intestinal growth and metabolism with nutrient intake
- Glycerol facilitator protein
- Good Laboratory Practice (See also GxP)
- Green Liberal Party, a Swiss political party.
- Guadeloupe (ISO 3166-1)