Sir Ralph Vincent Cusack (13 April 1916 – 11 March 1978) was an Irish-born barrister and English High Court judge.
He was educated at King's College School and the University of London, as well as in Italy.
In 1943-44 he was a Staff Captain, HQ Eastern Command, and with a promotion to major was Deputy Assistant Military Secretary at the War Office from 1944 to 1946, before resuming his legal career.
[1] Among his more notable cases, in 1962 he successfully defended two journalists who had refused to disclose their sources of information to the Vassall Tribunal.
His obituary in The Times described him as "the ideal judge... almost always being right and leaving the litigants thinking that he had been.