The Bad Seed is a five-part New Zealand television crime drama series, based on the best selling novels The Night Book and Soon by Charlotte Grimshaw, that broadcast across five consecutive nights on TVNZ 1 from 14 April 2019. Starring Matt Minto and Dean O'Gorman in the leading roles, The Bad Seed follows the Lampton family, whose quiet suburban lifestyle is rocked by the murder of one of their neighbours, wealthy businessman's wife Julia Stevens. Also featured amongst the cast are Madeleine Sami, Jodie Hillock, Xavier Horan and Chelsie Preston Crayford.

Casting for the series was announced in April 2018, with filming commencing shortly after. The series' screenplay was co-written by Sarah-Kate Lynch, Joss King and Michael Beran, with Helena Brooks, Caroline Bell-Booth and Mike Smith serving as directors. Outside of New Zealand, the series premiered in the United Kingdom on Alibi on 14 May 2019, with episodes airing weekly at 9:00pm on Tuesdays.