- Osborn Bergin (1873–1950)
- D. A. Binchy
- Nora Chadwick
- Ann Dooley
- Thomas Charles-Edwards
- Peter Berresford Ellis (1943-)
- Ellis Evans (1930-)
- Robin Flower (1881–1946)
- Sir Idris Foster (1911–1984)
- John Fraser (1882–1945)
- Richard Gendall
- Ken George
- R. Geraint Gruffydd
- Anton Gerard van Hamel (1886–1945)
- Kathleen Hughes
- Kenneth Hurlstone Jackson (1909–1991)
- Henry Jenner (1848–1934)
- Bobi Jones (1929-)
- Alexander Macbain
- Breandán Ó Madagain (1942-)
- Bernhard Maier (1963-)
- Ranko Matasović
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- Eoin McKiernan (1915–2004)
- Kuno Meyer (1858–1919)
- John Morris-Jones (1864–1929)
- Robert Morton Nance (1873–1959)
- Cecile O'Rahilly (1894–1980)
- T. F. O'Rahilly (1883–1953)
- Julius Pokorny (1887–1970)
- Sir John Rhys (1840–1915)
- Ailbhe Mac Shamhráin
- Marie-Louise Sjoestedt (1900–1940)
- Whitley Stokes
- Thomas Taylor (1858–1938)
- Derrick Thomson (1921-)
- Rudolf Thurneysen (1857–1940)
- Calvert Watkins
- Glanmor Williams
- Sir Ifor Williams (1881–1965)
- J. E. Caerwyn Williams (1912–1999)
- Nicholas Williams (1942-)
- Ernst Windisch (1844–1918)
- Johann Kaspar Zeuss (1806–1856)
- Heinrich Zimmer (1851–1910)
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