Smith Unionist Hall Unionist The 1919 Liverpool West Derby by-election was a parliamentary by-election held on 26 February 1919 for the British House of Commons constituency of Liverpool West Derby, in the County Palatine of Lancashire.

The seat had become vacant on the elevation to the peerage of the constituency's Unionist Member of Parliament (MP), F. E. Smith, as Baron Birkenhead.

He had been raised to the peerage to take up the post of Lord Chancellor.

Smith had held the seat since the 1918 general election, when he was endorsed by the Coalition Government.

Before that he held its predecessor seat, Liverpool Walton since the 1906 general election.