Horrible Histories is a British children's television series based on the Terry Deary book series of the same name. It aims to provide entertainment while also informing its audience about history, thereby making a stereotypically boring topic fun. The series has become very successful, and many of its musical numbers have become viral hits. The show has spawned a gameshow spinoff, Gory Games, and a re-edit of the show, designed for an older audience and hosted by Stephen Fry was also released. Horrible Histories was featured at the 2011 Proms, and an award-winning spin-off game called Terrible Treasures has also been released.

Each episode features a mixture of sketches and cartoons from different historic and prehistoric eras, and commentaries from Rattus Rattus, the puppet rat host. Some sketches are pastiches of various forms of media. The series also includes quizzes and songs.

The first series was broadcast in 2009, the second series was broadcast in 2010, the third series was broadcast in 2011, the fourth series was broadcast in 2012, and the fifth and final series is currently being aired on CBBC in 2013. Some specials have also aired, including a Christmas special and a sports special.