John Denis Joseph Moore Jr.^[1] (November 10, 1910 – September 12, 1988)^[2][3] was an American lawyer, business executive, and United States Ambassador to Ireland (1969–1975).^[3]

Moore was a graduate of Yale University and Yale Law School.^[2] He worked for White & Case before becoming assistant corporation counsel and then assistant district attorney for New York City.^[3] He later returned to private business and worked for W. R. Grace and Company.^[3] He traveled to South America and the Soviet Union in 1958 and 1959 with then Vice President Richard Nixon, in an advisory role.^[3]

In 1969, Moore was appointed ambassador to Ireland by President Nixon.^[4] After confirmation by the Senate, he presented his credentials to Irish leaders on June 23, 1969.^[4] He had the official title of Ambassador Extraordinary and Plenipotentiary, and served in the role until June 30, 1975.^[4] His brother, Richard A. Moore, later served as ambassador to Ireland under President George H. W. Bush.^[5]

While in Ireland, Moore's daughter Margaret died in October 1974,^[6] and his wife, Mary Foote Moore, died in January 1975^[7] – both were buried in Dublin. Moore died of bone cancer in Manhattan in 1988,^[3] and he was interred in Ireland next to his wife and daughter in Deans Grange Cemetery.^[8][7]

• The John Moore Newman Fellowship at ucdfoundation.ie
• "Deansgrange Cemetery. St. Brigid's Section, Pt 7, Co. Dublin, Ireland". Ireland Genealogy Projects Archives. Retrieved April 30, 2017. No.1012 JOHN D. J. MOORE 1910 - 1988 | United States Ambassador to Ireland | 1969 - 1975 | MARY FOOTE MOORE 1910 - 1975 | His Wife | MARGARET FOOTE MOORE 1938 - 1974 | Their Daughter | R.I.P.