Name	Known for
Sian Reese-Williams DCI Cadi John DCI Cadi John See fewer	Cysylltiad (Connection) (2021)
Sion Alun Davies DS Owen Vaughan (as Siôn Alun Davies) DS Owen Vaughan (as Siôn Alun Davies) See fewer	Hidden (2018)
Sion Ifan Siôn Thomas Siôn Thomas See fewer	Y Goleudy (2022)
Justin Melluish Glyn Thomas Glyn Thomas See fewer	Hidden (2018)
Rhodri Evan Father McEwan Father McEwan See fewer	Cowbois Ac Injans (2006)
Victoria Pugh DSI Susan Lynn DSI Susan Lynn See fewer	Torchwood (2006)
Mali Tudno Jones Rachel West Rachel West See fewer	35 Diwrnod (2014)
Megan Llyn Bethan John (as Megan Llyn Parri) Bethan John (as Megan Llyn Parri) See fewer	Hidden (2018)
William Thomas Dafydd Dafydd See fewer	Torchwood (2006)
Rhian Blythe Siwan Williams Siwan Williams See fewer	Gwaith/Cartref (2011)
Lewsyn Blaidd Watts Guto Williams Guto Williams See fewer	Hidden (2018)
Gwen Ellis Mair Williams Mair Williams See fewer	Hedd Wyn (1992)
Sarah Tempest Alys Mitchell Alys Mitchell See fewer	Hidden (2018)
Gwawr Loader PC Gwawr Daniels PC Gwawr Daniels See fewer	Hidden (2018)
Garmon Rhys PC Ryan Davies PC Ryan Davies See fewer	Hidden (2018)
Lara Catrin Lea Pryce Lea Pryce See fewer	Itopia (2022)
Dritan Kastrati Piotr Korecki Piotr Korecki See fewer	MobLand (2025)
Samuel Morgan-Davies Marc Marc See fewer	Hidden (2018)
Carwyn Jones Alun Alun See fewer	Stad (2022)
Dafydd Emyr Man at Bar Man at Bar See fewer	The Machine (I) (2013)
Cara Chase Gwennie Thomas Gwennie Thomas See fewer	Ayran Papers (2025)
Llyr Ifans Building Manager (as Llyr Evans) Building Manager (as Llyr Evans) See fewer	Twin Town (1997)
Kevin Harvey Assistant Chief Constable Assistant Chief Constable See fewer	Treason (2022)
Michelle Butterly Detective Chief Superintendent Detective Chief Superintendent See fewer	The Echo (1998)
Lily Beau Conway Nurse Nurse See fewer	The Light in the Hall (2022)
Steph Parry Housing Officer Housing Officer See fewer	Malpractice (2023)
Oliver Jones Ifan Williams Ifan Williams See fewer	Hidden (2018)