Walter Roch

for Pembrokeshire from 1908 to 1918 was a Welsh politician and landowner, whose political career ended when he continued to support H. H. Asquith over David Lloyd George.

Roch was born the second son of William Francis Roch, J.P., of Butter Hill, Pembrokeshire (who died in 1889) and his wife Emily Catherine Powell (she died in 1938), the second daughter of a Welsh Liberal politician Walter R.H. Powell, of Maesgwynne, Llanboidy, Carmarthenshire, MP (Lib.)

The by-election was held due to the elevation to the peerage of the incumbent Liberal MP, John Wynford Philipps.

During the campaign he had the active support of the MPs W. Llewelyn Williams and W. Jones of the United Kingdom Alliance and the Free Trade League respectively.

His opponent, John Lort-Williams, the Conservative candidate, was supported by emissaries from the Tariff Reform League and the National Trade Defence Association.