"The best way to define a psychological thriller is to say it's the type of story that explores the inner workings of one's mind, will generally feel dark in tone, and will usually be suspenseful and/or twist-filled. Defining a supernatural movie is a good deal simpler, as supernatural films will often combine fantasy and horror, and will revolve around ghosts, spirits, or other extraordinary phenomena. It thereby stands to reason that a supernatural psychological thriller film will simply do all of that all at once, and ideally, will provide an exceedingly scary viewing experience in the process. The following movies are some of the greatest of all time to blend classic supernatural horror tropes with oftentimes grittier or more relatable psychological themes, and given they can disturb and unnerve on multiple levels, they're not all for the faint of heart. Nonetheless, those feeling brave might want to check some of the following titles out if they haven't already." - collider.com