The Pontypridd by-election of 1922 was held on 25 July 1922. The by-election was held due to the appointment of the incumbent Coalition Liberal MP, Thomas Arthur Lewis, as a Junior Lord of the Treasury. It was won by the Labour candidate Thomas Isaac Mardy Jones. It was the last of only eight ministerial by-elections in the UK not to be retained by the incumbent. The requirement for MPs who were appointed as ministers to seek re-election was entirely abolished by the Re-Election of Ministers Act (1919) Amendment Act 1926.
|C||Liberal||Thomas Arthur Lewis||12,550||43.0||-13.1|
|Labour gain from Liberal||Swing|
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