Politics
- David Davies (industrialist) (1818–1890), also known as David Davies Llandinam, MP for Cardigan, 1874–1885, and Cardiganshire, 1885–1886
- David Sanders Davies (1852–1934), Liberal politician, MP for Denbigh 1918–1922
- Sir David Davies (dairyman) (1870–1958), Conservative politician
- David Lewis Davies (1873–1937), British Member of Parliament for Pontypridd, 1931–1937
- Dai Davies (trade unionist) (1909–1998), Labour Party official and general secretary of the ISTC
- Dai Davies (politician) (born 1959), Independent Member of Parliament for Blaneau Gwent 2006–2010
- David Davies (Welsh politician) (born 1970), Welsh Conservative politician, and British Member of Parliament elected in 2005
- Dave Davies (Ontario politician)
- David Richard Seaborne Davies (1904–1984), Welsh legal academic, briefly a British Liberal Party Member of Parliament in 1945
- David Arthur Saunders Davies, British Member of Parliament for Carmarthenshire
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