John Thomas Riedl (January 16, 1962 – July 15, 2013) was an American computer scientist and the McKnight Distinguished Professor at the University of Minnesota.

During his time as a professor he advised 16 Ph.D. students who went on to take faculty positions and work at technology companies like Google, PARC, Intel, eBay, and the Wikimedia Foundation.

He was also the faculty advisor for a long-running project in which twelve undergraduates each year would hone their entrepreneurial and software-development skills by taking charge of the development and maintenance of Chipmark, an online bookmark-sharing service.

In 1996, he co-founded Net Perceptions[9] to commercialize recommender systems research, which had "an enormous impact on e-commerce and information portals.

[5] He received numerous awards for his conference publications including best papers at CSCW, IUI, and WikiSym.