Lapp or LAPP may refer to:

• a now dated term for the Sami people
• Light art performance photography, a technique in photography emphasizing landscapes, scenery and objects with light. It's a symbiotic art between a performance with light and a shutter that's open for a long time
• The Laboratoire d'Annecy-le-Vieux de physique des particules, a French experimental physics laboratory located in Annecy-le-Vieux in the Savoie region of France
• A variation on the LAMP software stack

LAMP is an archetypal model of web service solution stacks, named as an acronym of the names of its original four open-source components: the Linux operating system, the Apache HTTP Server, the MySQL relational database management system (RDBMS), and the PHP programming language. The LAMP components are largely interchangeable and not limited to the original selection. As a solution stack, LAMP is suitable for building dynamic web sites and web applications.