1972 Merthyr Tydfil by-election
The Merthyr Tydfil by-election of 13 April 1972 was held after the death of S. O. Davies on 25 February the same year. The Labour Party won the by-election in what had traditionally been a safe seat, although Davies had been elected in the 1970 general election as an Independent after he had been deselected due to his age.
|Plaid Cymru||Emrys Roberts||11,852||37.0||+27.44|
|Communist||Arthur Lewis Jones||1,519||4.74||N/A|
|Labour gain from Independent||Swing|