George FitzGerald (1851 - 1901) was an Irish physicist.

He was also the uncle of another Irish physicist George FitzGerald the son of his sister Anne.

December 20 - Nicholas Callan, Irish physicist (died 1864)

Roy Johnston (born 1929) is an Irish physicist.

February 21 - Osborne Reynolds, Irish physicist (b. 1842)

George Johnstone Stoney (1826-1911), the Irish physicist who introduced the term "electron"

Dennis M. Jennings is an Irish physicist, academic, Internet pioneer, and venture capitalist.

Margaret Mary Murnane (born 1959) is an Irish physicist.

Weaire has a strong interest in the history of science and has edited several collections of historical essays on Irish physicists.

December 8 - John Joly (born 1857), Irish physicist.