| Hildebrando Pompeu Pinto Accioli | |
| Office: | of  Brazil to |
| Successor: | Maurizio Nabuco |
| Office2: | director of the Rio Branco Institute |
| Successor2: | Jacome Baggi de Berenguer César |
| Birth Date: | 25 June 1888 |
| Birth Place: | Fortaleza |
| Death Place: | Rio de Janeiro |
| Father: | politician cearense |
| Mother: | Maria Teresa de Sousa Accioly |
| Spouse: | married to Olga Barbosa Accioly |
| Alma Mater: | Ceará Law School |
Hildebrando Pompeu Pinto Accioli (June 25, 1888 – April 4, 1962) was a Brazilian diplomat and on two occasions in 1947 and 1948 Minister of Foreign Affairs, in the absence of Chancellor Raul Fernandes.
In 1914, Hildebrando Accioli joined the diplomatic service. In 1924, he was first secretary in the permanent delegation to the League of Nations in Geneva.
In 1936, Hildebrando Accioli represented Brazil as minister at the Inter-American Conference for the Consolidation of Peace (Buenos Aires, 1936). In 1937, he was raised to the post of Secretary General of the Ministry of Foreign Affairs. In 1938, he headed the Brazilian delegation to the VIII Conference International American Countries, in Lima, when he was promoted to ambassador.
From to, he was Ambassador to the Holy See. From to, Hildebrando Accioli was director of the Rio Branco Institute.
In 1946 Hildebrando Accioli returned to the post of general secretary of foreign affairs. He was delegate plenipotentiary to the Paris Peace Treaties, 1947.
Between May and June 1947, and between September and December 1948, he was Brazilian Minister of Foreign Affairs ad interim. Until 1950, he was president of the Permanent Council of the Organization of American States. In 1950, he was the tenth Legal Adviser of the Ministry of Foreign Affairs.
Hildebrando Accioli retired from Brazilian politics in 1953.
In 1957, he joined the Permanent Court of Arbitration at The Hague.