1878 Middlesex by-election

{{Short description|UK Parliamentary by-election}}

{{Use dmy dates|date=August 2019}}

{{Use British English|date=August 2019}}

A by-election was held in Middlesex on 12 April 1878, due to the incumbent Conservative MP, Lord George Hamilton, becoming Vice-President of the Committee of the Council on Education. It was retained by the incumbent unopposed.{{cite book |last=Craig |first=F. W. S. |author-link= F. W. S. Craig |title=British parliamentary election results 1832–1885 |edition=1 |year=1977 |publisher=Macmillan |location=London |page= 425}}