PTR

PTR can refer to:


 * Particle transfer roller, for cleaning motion picture film
 * Peak-to-trough ratio, a parameter in pharmacokinetics
 * Petir LRT station (LRT station abbreviation), Singapore
 * PetroChina (NYSE: PTR)
 * Photothermal Ratio, light/temperature ratio for a plant
 * Physical transmission right in the electricity market
 * Physikalisch-Technische Reichsanstalt, later Physikalisch-Technische Bundesanstalt, a German research institute
 * Pitrilysin, an enzyme
 * Planar ternary ring in algebra
 * Pool Test Reactor, Canada
 * Proton-transfer-reaction mass spectrometry, used in chemical analysis
 * PTR rifle, made by PTR Industries, Inc., US
 * A type of DNS record in computer networking
 * Pointer in computer programming (e.g. the PTR keyword in x86 assembly language)
 * Palanivel Thiagarajan, an Indian politician
 * Puerto Rico, ITU country code
 * Public Test Realm, a server in Overwatch where updates are tested by developers for player feedback