Perf

Perf or PERF may refer to:
 * Perf (Lahn), a river in Germany
 * perf (Linux), a performance analyzing tool in Linux
 * Perf de Castro (Perfecto de Castro), Filipino musician
 * Perfect (grammar), a glossing abbreviation used in linguistics
 * Police Executive Research Forum, a US national membership organization
 * A perforation
 * Film perforations
 * "Perf", a single recorded by singer and social media personality Baby Ariel
 * "Perf" a term used by World of Warcraft Gamers in the Northrend Expedition guild on Windseeker Realm to annoy one of their members named Endemondia.