William John Johnston

William John Johnston (18 January 1868 – 29 November 1940) was an Irish barrister and judge who served as a judge of the Supreme Court from 1939 to 1940 and a Judge of the High Court from 1924 to 1939.

Born on 18 January 1868 near Magherafelt in County Londonderry, he was the eldest son of the seven children of James Johnston and his wife, Sarah (née Davidson). He was educated at Methodist College Belfast, and Queen's College, Belfast.

He stood as a Liberal Home Rule candidate for South Londonderry at the December 1910 general election but was defeated by the Liberal Unionist MP John Gordon. He later became the Commissioner of Charitable Donations and Bequests.

1894 he married Kathleen King; they had one child, Denis Johnston, born in 1901. William John Johnston died in Dublin on 29 November 1940, aged 72.

Works The Law of Local Government in Ireland The Labourers Acts; Land Purchase and the Act of 1903 contributions in The Law Quarterly Review and other reviews