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

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

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