Lemp may refer to:
- Lemp family, brewers in St. Louis, Missouri, and places named after them:
- Lemp Mansion
- Lemp Neighborhood Arts Center
- Fritz-Julius Lemp (1913-1941), U-boat commander during World War II
- LEMP: Lightning Electromagnetic Pulse, see Electromagnetic_compatibility#Pulse_or_transient_interference
- A variation on the LAMP software bundle.