The National Institute for Discovery Science (NIDSci) was a privately financed research organization based in Las Vegas, Nevada, USA, and operated from 1995 to 2004.

It was founded in 1995 by real-estate developer Robert Bigelow, who set it up to research and advance serious study of various fringe science and paranormal topics, most notably ufology.

The National Institute for Discovery Science, known also as NIDS, was founded by Robert Bigelow serving as a way to channel funds into the scientific study of paranormal phenomena.

The NIDS performed research in the area of cattle mutilation and black triangle reports.

[1] The NIDSci bought Skinwalker Ranch after journalist George Knapp first wrote about it in 1996, and Deputy Administrator Colm Kelleher led the investigation for a number of years.