John William Ronald Ilangakoon, KC (16 August 1894 - 1982) was a Ceylonese lawyer.
He was succeeded by Arthur Wijewardena and was appointed King's Counsel in 1936.
[1][2] He was appointed Attorney General on 1 October 1936, succeeding John Curtois Howard, and held the office until 1942.
He was succeeded by Manikku Wadumestri Hendrick de Silva.
[3] He married Annette Lena Dias Bandaranaike daughter of Justice Felix Reginald Dias Bandaranaike I on 10 October 1914.