Rochdale by-election may refer several by-elections in Rochdale, Lancashire, England:

• 1940 Rochdale by-election, following the resignation of William Kelly; an unopposed war-time election
• 1958 Rochdale by-election, following the death of Wentworth Schofield; the first televised election in the UK
• 1972 Rochdale by-election, following the death of Jack McCann; Cyril Smith was elected
• 2024 Rochdale by-election, following the death of Tony Lloyd; George Galloway was elected

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