Tracer

Tracer may refer to:

Science

 * Flow tracer, any fluid property used to track fluid motion
 * Fluorescent tracer, a substance such as 2-NBDG containing a fluorophore that is used for tracking purposes
 * Histochemical tracer, a substance used for tracing purposes in histochemistry, the study of the composition of cells and tissues
 * Isotopic tracer, a substance with an isotope that has been enriched to a greater level than that found in nature
 * Radioactive tracer, a substance containing a radioisotope that is used for tracking purposes
 * TRACER (cosmic ray detector) (Transition Radiation Array for Cosmic Energetic Radiation), a balloon-borne cosmic ray detector
 * Tracers, a colloquialism for visual trailing, often experienced in connection with drug use
 * TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites), a pair of orbiters to study the origins of the solar wind and how it affects Earth

Military

 * Tracers, tracer ammunition, special bullets that burn brightly to enable the shooter to follow the bullets' trajectories
 * Tactical reconnaissance and counter-concealment-enabled radar (TRACER), a radar system developed by the United States Army
 * Grumman E-1 Tracer, a carrier-borne early warning aircraft used by the United States Navy in the 1960s
 * Tactical Reconnaissance Armoured Combat Equipment Requirement, a joint British–American scout vehicle

Music

 * Tracer (band), an Australian rock band
 * Tracer (album), a 2012 album by Teengirl Fantasy
 * "Tracers", song by Ash (band) from A-Z, Vol.1 2010
 * "Tracers", song by Miracle Fortress from Was I the Wave? 2011
 * "Tracers", song by Trans-Siberian Orchestra from Night Castle 2009

Films

 * Tracer (film), a 2016 Vietnamese film
 * Tracers (film), a 2015 American film

Video games

 * Tracer (game), a 1995 action-puzzle video game
 * Tracer, a 1976 Sega arcade video game
 * Tracer, leader of the Eliminators in The Warriors
 * Tracer (Overwatch), a player character from the video games Overwatch and Heroes of the Storm
 * Tracer Tong, a character from the video game series Deus Ex

Comics and comic strips

 * Tracer (DC Comics), a DC Comics character
 * Tracer (Marvel Comics), a Marvel Comics supervillain
 * Tracer Bullet, one of Calvin's alter egos in Calvin and Hobbes

Television

 * Tracer (TV series), a 2022 South Korean television series

Transportation

 * Mercury Tracer, an automobile
 * Tracer (bus), the bus system for Tracy, California
 * Yamaha Tracer 900
 * Yamaha Tracer 700
 * MonoTracer
 * Zerotracer
 * E-Tracer and X-Tracer by Peraves