Hidden (Welsh: Craith) is a Welsh television drama serial, created by Mark Andrew and Ed Talfan. It was initially broadcast in Welsh on the Welsh-language channel S4C under its Welsh name Craith. The bilingual version of the series, under the English name Hidden, was broadcast on BBC One Wales and BBC Four. The Welsh-language versions of the first two series aired on S4C in 2018 and 2019, respectively, with the third and final series beginning on 10 October 2021. The English-language version of the third and final series aired in April 2022.