- Directors of NPL
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E. V. Appleton
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W. L. Bragg
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C. G. Darwin
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Peter Clapham
- Sir Richard Tetley Glazebrook, 1900–1919
- Sir Joseph Ernest Petavel, 1919–1936
- Sir Frank Edward Smith, 1936-1937 (acting)
- Sir William Lawrence Bragg, 1937–1938
- Sir Charles Galton Darwin, 1938–1949
- Sir Edward Victor Appleton, 1941 (acting)
- Sir Edward Crisp Bullard, 1948–1955
- Dr Reginald Leslie Smith-Rose, 1955-1956 (acting)
- Sir Gordon Brims Black McIvor Sutherland, 1956–1964
- Dr John Vernon Dunworth, 1964–1977
- Dr Paul Dean, 1977–1990
- Dr Peter Clapham, 1990–1995
- Dr John Rae, 1995–2000
- Dr Bob McGuiness, 2000–2005
- Steve McQuillan, 2005–2008
- Dr Martyn Sené, 2008-2009 (acting)
- Dr Brian Bowsher, 2009–Present
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