Viscounts Marchwood (1945)
- Frederick George Penny, 1st Viscount Marchwood (1876–1955)
- Peter George Penny, 2nd Viscount Marchwood (1912–1979)
- David George Staveley Penny, 3rd Viscount Marchwood (b. 1936)
The heir apparent is the present holder's son the Hon. Peter George Worsley Penny (b. 1965)
The heir apparent's heir apparent is his son Christopher (Kit) David George Penny (b. 1999)
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