Ar Ebrill 11eg. 1864 agorwyd Ysgol Fritanaidd Bethel mewn adeilad sydd erbyn hyn wedi ei addasu yn ddau dy. Ar y diwrnod cyntaf roedd 71 o blant yn yr ysgol.

Yn Hydref 1881 fe agorwyd yr ysgol newydd, sef yn yr adeilad presenol, ac fe ychwanegwyd ystafelloedd at yr adeilad yn 1910-11 pan gauwyd yr ysgol am flwyddyn. Erbyn heddiw mae 184 o blant yn yr ysgol.

Heblaw am symyd adeilad bu dau newid a ddylanwadodd ar niferoedd plant yn yr ysgol. Yn gyntaf y plant dros 11 yn mynd i Ysgol Caernarfon yn dilyn adrefnu ysgolion y sir yn 1931 a derbyn plant meithrin yn 3 oed yn 1998.

On April 11th. 1864 Bethel British School was opened in a building which has been developed into two dwellings by now. On the day of opening there were 71 children on the register.

In October 1881 a new school was opened on the present site. The school was closed for a whole year in 1910-11 in order to build an extension and to refurbish the school. Today there are 184 children at the school.

Apart from the change of buildings, two major changes have influenced the number of children at the school. Firstly when children over 11 went to Caernarfon School following the reorganisation of schools in 1931 and secondly the influx of 3 year old nursery children in 1998.