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Fiducial may refer to:

  • Fiduciary, in law, a person who holds a legal or ethical relationship of trust
  • Fiducial inference, in statistics, a form of interval estimation
  • "Fiducial line" or "fiducial edge" of an alidade, an instrument used to measure the angle to a distant object
  • Fiducial marker or fiducial, an object or marking placed in an image for use as a point of reference
  • Reference point (disambiguation), or origin of a frame of reference

In particle physics[edit]

  • Fiducial cross section, in particle physics experiments, a cross section in which a detector operates with high sensitivity
  • Fiducial volume, in low-background physics experiments, an inner volume of particle detector media in which background events are largely excluded