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Precursor or Precursors may refer to:

• Precursor (bird), a hypothesized genus of fossil birds that was actually composed of fossilized parts of unrelated animals
• Precursor (chemistry), a compound that participates in the chemical reaction that produces another compound
• Precursor, a novel set in the Foreigner universe by C. J. Cherryh
• Precursor (Star Control), a fictional alien race in the video game Star Control
• Precursorism, a historiographic tendency in the history of science
• Precursors (video game), an unreleased video game from Kiev-based developer Deep Shadows
• Protein precursor, an inactive protein or peptide that can be turned into an active form

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