Dyma restr anghyflawn o gadeiryddion Cymdeithas yr Iaith:
- 1962-63 - Tedi Millward a John Davies (ysgrifenyddion)
- 1963-64 - John Daniel
- 1964-65 - John Daniel
- 1965-66 - Cynog Dafis
- 1966-67 - Emyr Llywelyn yn gyntaf, ac wedyn Gareth Miles
- 1967-68 - Gareth Miles
- 1968-69 - Dafydd Iwan
- 1969-70 - Dafydd Iwan
- 1970-71 - Dafydd Iwan
- 1971-72 - Gronw ab Islwyn
- 1972-73 - Gronw ab Islwyn
- 1973-74 - Emyr Hywel
- 1974-75 - Ffred Ffransis
- 1975-76 - Wynfford James
- 1976-77 - Wynfford James
- 1977-78 - Rhodri Williams
- 1978-79 - Rhodri Williams
- 1979-80 - Wayne Williams
- 1980-81 - Wayne Williams
- 1981-82 - Meri Huws
- 1982-83 - Angharad Tomos
- 1983-84 - Angharad Tomos
- 1984-85 - Karl Davies
- 1985-86 - Toni Schiavone
- 1986-87 - Toni Schiavone
- 1987-88 - Helen Prosser
- 1988-89 - Helen Prosser
- 1989-90 - Sian Howys
- 1990-91 - Alun Llwyd
- 1991-92 - Alun Llwyd
- 1992-93 - Alun Llwyd
- 1993-94 - Aled Davies
- 1994-95 - Rocet Arwel Jones
- 1995-96 - Rocet Arwel Jones
- 1996-97 - Gareth Kiff
- 1997-98 - Gareth Kiff
- 1998-99 - Branwen Niclas
- 1999-2000 -
- 2000-01 - Gwyn Siôn Ifan
- 2001-02 - Branwen Brian Evans ac Aled Davies (cyd-gadeiryddion)
- 2002-03 - Huw Lewis
- 2003-04 - Huw Lewis
- 2004-05 - Steffan Cravos
- 2005-06 - Steffan Cravos
- 2006-07 - Steffan Cravos
- 2007-08 - Hywel Griffiths
- 2008-09 - Menna Machreth
- 2009-10 - Menna Machreth
- 2010-11 - Bethan Williams
- 2011-12 - Bethan Williams
- 2012-13 - Bethan Williams
- 2013-14 - Robin Farrar
- 2014-15 - Jamie Bevan
- 2015-16 - Jamie Bevan
- 2016-17 - Heledd Gwyndaf
- 2017-18 - Heledd Gwyndaf
- 2018-19 - Osian Rhys
- 2019-20 - Bethan Ruth Roberts[1]
- 2020-21 - Mabli Siriol[2]
- 2021-22 - Mabli Siriol
- 2022-23 Robat Idris
- 2023 - Joseff Gnagbo
- ↑ Bethan Ruth Roberts yw cadeirydd newydd Cymdeithas yr Iaith , Golwg360, 16 Hydref 2019. Cyrchwyd ar 1 Tachwedd 2019.
- ↑ Mabli Siriol yw cadeirydd newydd Cymdeithas yr Iaith , Golwg360, 7 Tachwedd 2020.