The 1907 West Down by-election was held on 6 September 1907. The by-election was held due to the resignation of the incumbent Irish Unionist MP, Harry Liddell. It was won by the Irish Unionist candidate Arthur Hill.
|Irish Unionist||Lord Arthur Hill||3,702||55.9||N/A|
|Ind U||Andrew Beattie||2,918||44.1||N/A|
|Irish Unionist hold||Swing||N/A|