Precursor or Precursors may refer to:
- A word meaning predecessor
- Gehrlein Precursor, a glider
- Precursor (chemistry), a compound that participates in the chemical reaction that produces another compound
- Precursor (physics), a phenomenon of wave propagation in dispersive media
- Earthquake precursor, a diagnostic phenomenon that can occur before an earthquake
- Precursor (bird), a hypothesized genus of fossil birds that was actually composed of fossilized parts of unrelated animals
- The Precursors (video game), a video game from Kiev-based developer Deep Shadows
- LNWR Whale Precursor Class, type of passenger locomotive developed for the London and North Western Railway
- Precursors Halo (series), An extremely advanced race that preceded and were destroyed by, by The Forerunners
- Precursor, a novel set in the Foreigner universe by C. J. Cherryh
- Precursors, a fictional race (now extinct) of ancient beings in the board game Cosmic Encounter
- Precursors, a fictional alien race in the Star Control video game series
- Precursors, a fictional race of ancient beings in the video game Jak and Daxter: The Precursor Legacy
- Precursors, a fictional alien race in Galactic Civilizations II: Dread Lords video game
- Precursor, a Half-Life 2: Episode Two Modification
- Precursors, a fictional, extinct alien race that supposedly created humanity in the Assassin's Creed series
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