Boo! is a British computer-animated children's television series that was broadcast in the United Kingdom on the CBeebies channel, and originally on BBC Two. It features several cartoon characters who play a game similar to hide and seek in a variety of settings. The commentary is performed by adult male and female narrators and a chorus of children. It was produced by the independent production company Tell-Tale Productions, which was also responsible for Tweenies, while Universal Pictures co-funded the production and handled worldwide distribution and consumer product rights. From 2007 to 2012, reruns of the show were broadcast in the USA on Qubo.

The series aired for a total of 104 episodes and one Christmas special was nominated for the British Academy Children's Award for Pre-School Animation in 2003.

At the end of the programme, a song is sung, usually about matching characters or objects to their shapes or colours.

The visual style of Boo! is very distinctive, using 3D CGI with rounded shapes and cel-shading. The music and songs are generally in an early-70s funk/R&B idiom.