The Worst Witch is a fantasy drama children's television series. Based on novel series of the same name published in 1974 by Jill Murphy, the series follows Mildred Hubble (Bella Ramsey and Lydia Page) and her friends Maud Spellbody (Meibh Campbell and Megan Hughes) and Enid Nightshade (Tamara Smart) and rivals Ethel Hallow (Jenny Richardson), Drusilla Paddock (Tallulah Milligan) and Felicity Foxglove's (Dagny Rollins) adventures and education at Cackle's Academy under caring headmistress Miss Cackle (Clare Higgins) and strict deputy headmistress Miss Hardbroom (Raquel Cassidy). It is the fifth adaptation of The Worst Witch series after the 1986 television film, the 1998 television series, the 2001 television spin-off and the 2005 television spin-off.

The series was an international co-production between CBBC, ZDF and Netflix. The series was made available to stream internationally on Netflix on 22 July 2017. It was available to members in the UK, Ireland and Germany after its premiere on CBBC and ZDF. The series premiered on CBBC on 11 January 2017. A second series began airing from 8 January 2018. The second series premiered on Netflix Australia on 27 July 2018. The third series began airing on 7 January 2019. The fourth series began airing on 27 January 2020. Netflix released the fourth series on 1 October 2020.