Johnny Test is an American/Canadian animated television series created by Scott Fellows. It premiered on Kids' WB, on The WB Television Network, on September 17, 2005 and concluded its run on December25, 2014 (January 2, 2015 in other countries) with 6 seasons. Despite the merger of the UPN (CBS Corporation) and that programming block's parent channel into The CW Television Network,

The show still continued to air on Kids' WB, on The CW, with its second and third seasons, through October 28, 2006, to March 1, 2008. The series currently aired in the United States on Cartoon Network startingon January 7, 2008, and in Canada on Teletoon, on September 8, 2006. The series aired on Cartoon Network in over 75 countries in 19 languages. It also aired on other channels that vary by country. The show was produced by Warner Bros. Animation for the first season, then from the second season by Teletoon. and later seasons by Cookie Jar Entertainment. Starting from season 6, the show is produced by DHX Media.

On May 2, 2020, Johnny Test: The Lost Web Series premiered on YouTube. However, the first episode was privated 2 days later.

In January 2020, WildBrain announced that their Vancouver studio was hiring for a new Johnny Test project separate from the web-shorts. On May 6, 2020, WildBrain confirmed the series had been picked up by Netflix for two more seasons and a 66-minute interactive special set for release in 2021, with Fellows returning as showrunner and executive producer. The first of which was released on July 16.