GEIPAN (an acronym in French for Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non-identifiés, or Unidentified Aerospace Phenomenon Research and Information Group) (/ɡaɪˈpɑːn/) is a unit of the French space agency CNES based in Toulouse, whose brief is to investigate unidentified aerospace phenomena (UAP)[1] and make its findings available to the public.

GEPAN was renamed to SEPRA (Service d'Expertise des Phénomènes de Rentrée Atmosphérique, Atmospheric Re-entry Phenomena Expertise Department) in 1988,[2] and then to Service d'Expertise des Phénomènes Rares Aérospatiaux ("rare aerospace phenomena expertise department") in 2000.

[2] The French Gendarmerie was instructed to channel data from reports of UFO sightings to SEPRA, which therefore was in a position to draw on a large database of such events.

In cases where physical traces appeared to be present, SEPRA could call on the technical resources of CNES to perform a thorough scientific investigation.

The same year, French skeptics criticized the quality of their investigative work, arguing the sightings were too quickly filed as unidentified.