Bethania was a Calvinistic Methodist chapel in Aberdare, Rhondda Cynon Taf, Wales, which seated 550 people.

[1] Located near the centre of Aberdare, it had a somewhat concealed entrance and was approached up a long flight of steps.

The cause is said to have begun with the holding of a Sunday School at the Black Lion hotel, immediately in front of where the chapel was built.

[4] Bethania's membership declined rapidly after the Second World War, although the opening of Ysgol Gynradd Gymraeg Aberdâr [cy] briefly revived the Sunday School, allowing the then minister to address the children in Welsh for the first time or many years.

In 1965 a service was held at Bethania to mark the centenary of the Welsh colony in Patagonia.