Tracer

Tracer may refer to:
 * 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
 * Flow tracer, any fluid property used to track fluid motion:
 * Dye tracer
 * In the ocean, salinity, potential temperature, and the concentration of many different chemical compounds
 * Tracer ammunition, special bullets that burn brightly to enable the shooter to follow the bullets' trajectories
 * Mercury Tracer, an automobile
 * Tracer (DC Comics), a DC Comics character
 * Tracer (Marvel Comics), a Marvel Comics supervillain
 * TRACER (magazine), a music magazine based out of Cincinnati, Ohio.

See also: Trace, Tracing, Tracer use in the oil industry, traser

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