The 1958 Pontypool by-election was held on 10 November 1958 after the incumbent Labour MP, Granville West was elevated to a life peerage. The seat was retained by the Labour candidate Leo Abse.
^Craig, F. W. S. (1971). British parliamentary election results 1950-1970 (1 ed.). Chichester: Political Reference Publications. ISBN9780900178023. Page 588