Jansen Panettiere (born September 25, 1994 in Palisades, New York), younger brother of Hayden Panettiere, is an American voice and film actor.

Jansen and his sister Hayden co-starred in the Disney Channel Original Movie Tiger Cruise. He played the voice of Truman X in The X's, but the show has recently been cancelled. He starred as Lucas Malloy in the made-for-television Nickelodeon film The Last Day Of Summer, which first showed July 20th on Nickelodeon. It was released on DVD on August 28th 2007. His next film, The Perfect Game, will be released in theaters on August 8th 2008. The in-production film, directed by William Dear, will be about how a group of baseball players become the first non-U.S. team to win the Little League World Series, which was based on a true story. He enjoys spending his spare time with his cousin, Colin Panettiere.[citation needed]