Associação de Pesquisa OVNI (APO) is a Portuguese organisation focused on the investigation and discussion of unidentified flying objects and related phenomena. Its website brings together reports of sightings, historical cases, articles and research across subjects including abductions, extraterrestrial encounters, UFOs, aerial phenomena and mysteries of the ancient world. Visitors can browse accounts from Portugal and other countries, explore press clippings and links to UFO-related resources, and contribute through a sighting report and questionnaire.

The site also features information about APO’s activities, events, interviews, astronomy and research, alongside book suggestions and a community mural. Its extensive archive covers topics such as crop circles, Marian apparitions, cattle mutilations, intraterrestrial phenomena and unidentified submerged objects, reflecting a broad interest in unexplained events and claims. APO serves as an information and participation hub for people curious about UFO reports and related subjects, offering a place to read collected material, follow investigations and share observations