This is a list of topics studied in the field of Ufology.
- Alien abduction
- Ancient astronaut theories
- Aura
- Close encounter
- Crop circle
- Extraterrestrial hypothesis (ETH)
- Identified flying object (IFO)
- Interdimensional hypothesis
- Interplanetary Phenomenon Unit (IPU)
- Military flying saucers
- Missing time
- Psychosocial Hypothesis
- Unidentified flying object (UFO)
- Unidentified submerged object (USO)
- Xenoarchaeology
- Zoo hypothesis
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