The 1920 Abertillery by-election was held on 21 December 1920. The by-election was held due to the resignation of the incumbent Labour MP, William Brace. It was won by the Labour candidate George Barker.

References

Abertillery by-election 1920s elections in Wales Elections in Monmouthshire Abertillery by-election By-elections to the Parliament of the United Kingdom in Welsh constituencies 20th century in Monmouthshire Abertillery by-election {{Wales-UK-Parl-by-election-stub