Roswell is an American science fiction television series that presents a timeline where the Roswell UFO exists, and aliens are hiding in plain sight as a trio of high school-aged teenagers. Developed, produced, and co-written by Jason Katims, the series debuted on October 6, 1999 on the WB, and later shifted to UPN for the third season. The final episode aired on May 14, 2002. Sixty-one episodes in total were broadcast over the show's three seasons. In the United Kingdom, the show aired as both Roswell High and Roswell.

The series is based on the Roswell High young adult book series, written by Melinda Metz and edited by Laura J. Burns, who later became staff writers for the television series.

A reimagining of the series, titled Roswell, New Mexico was ordered to series on May 11, 2018, and premiered on January 15, 2019, on The CW.