Paranormal Site Investigators
 United Kingdom charity Paranormal Site Investigators (PSI) is dedicated to advancing education research and heritage in the area of anomalous experience. The charity has a membership of around 1400. The charity patron is Peter Underwood.PSI publishes the Journal of Investigative Psychical Research free to subscribers since 2005; the journal is kept by the library of the Society for Psychical Research and the British Library.