Chaos;Child (stylized as ChäoS;Child) is a visual novel video game developed by 5pb. It is the fourth main entry in the Science Adventure series, and a thematic sequel to Chaos;Head (2008). It was released in Japan in 2014 for Xbox One, and later for PlayStation 3, PlayStation 4, PlayStation Vita, Microsoft Windows, iOS, Android, and Nintendo Switch. An English localization was released for the PlayStation 4 and PlayStation Vita by PQube in 2017, and for Windows by Spike Chunsoft in 2019.