Ronny Rieken (born 12 February 1968) is a German child murderer. In 1996 and 1998, he killed two girls in the area surrounding Cloppenburg, northern Germany. Rieken was the first German criminal to be caught as a result of mass DNA screening. In 1998, he was sentenced to life imprisonment, which he is serving at Justizvollzugsanstalt Celle.