Dennis the Menace and Gnasher (originally known as Dennis and Gnasher in its first series) is an animated television series which was aired on the CBBC Channel. Based on the original comic strips from The Beano, it features the adventures of the rebellious schoolboy Dennis the Menace and his dog Gnasher. The programme is aimed for ages 6–12 and commenced on 7 September 2009 and ended on 2 March 2010 after 52 episodes.

A second series was started at 3.45 pm on 8 July 2013 on the CBBC Channel. It was preceded by Dennis and Gnasher which aired in 1996 and a new series in 1998.