| Date of Death | Deceased Bishops (78) |
| 1966? | Prefect Apostolic of Yiduxian 益都縣 (China) (1958 – 1966?▼) |
| 1966? | Bishop of Yongping 永平 (China) (1958 – 1966?▼) |
| 1966 | Metropolitan Archbishop of Beijing 北京 (China) (1959 – 1966▼) |
| 1966.01.04 | Metropolitan Archbishop emeritus of Popayán (Colombia) (1942.06.20 – 1944.02.01) |
| 1966.01.10 | Metropolitan Archbishop of Bloemfontein (South Africa) (1954.07.18 – 1966.01.10) |
| 1966.01.12 | |
| 1966.01.17 | Coadjutor Vicar Apostolic emeritus of Baie d’Hudson (Canada) (1937.07.01 – 1940) |
| 1966.01.25 | Bishop-Prelate emeritus of Paracatu (Brazil) (1940.05.25 – 1962.04.14) |
| 1966.01.27 | |
| 1966.02.02 | |
| 1966.02.03 | |
| 1966.02.10 | Titular Archbishop of Gortyna (1946.05.08 – 1966.02.10) |
| 1966.02.22 | Metropolitan Archbishop of Rubaga (Uganda) (1960.12.20 – 1966.02.22) |
| 1966.02.24 | |
| 1966.03.03 | Cardinal-Priest of S. Callisto (1958.12.18 – 1966.03.03) Metropolitan Archbishop of Napoli (Italy) (1958.02.07 – 1966.03.03) |
| 1966.03.05 | |
| 1966.03.09 | Bishop of Haarlem (Netherlands) (1960.06.27 – 1966.03.09) |
| 1966.03.10 | Archbishop-Bishop of Hyderabad (Pakistan) (1958.04.28 – 1966.03.10) |
| 1966.03.10 | Bishop of Laohekou 老河口 (China) (1946.04.11 – 1966.03.10) |
| 1966.03.14 | |
| 1966.03.20 | Vicar Apostolic emeritus of Zanzibar (Tanzania) (1932.03.15 – 1946) |
| 1966.04.07 | |
| 1966.04.17 | Bishop of Montefeltro (Italy) (1949.12.12 – 1966.04.17) |
| 1966.04.21 | Auxiliary Bishop of Bamberg (Germany) (1959.06.13 – 1966.04.21) |
| 1966.04.21 | Vicar Apostolic emeritus of Egypt (Egypt) (1921.12.20 – 1949.03) |
| 1966.04.24 | |
| 1966.05.09 | Bishop of ’s-Hertogenbosch (Netherlands) (1960.06.27 – 1966.05.09) |
| 1966.05.14 | Bishop-Prelate of Batanes and the Babuyan Islands (Philippines) (1951.07.02 – 1966.05.14) |
| 1966.05.16 | Vicar Apostolic emeritus of Niangara (Congo-Kinshasa) (1924.12.18 – 1948) |
| 1966.05.20 | Auxiliary Bishop of Santiago de Compostela (Spain) (1956.04.09 – 1966.05.20) |
| 1966.05.21 | Bishop of Massa Marittima e Populonia (Italy) (1933.08.09 – 1966.05.21) |
| 1966.05.21 | Bishop of Telšiai (Lithuania) (1964.02.14 – 1966.05.21) Bishop-Prelate of Klaipėda (Lithuania) (1949.12.20 – 1966.05.21) |
| 1966.05.23 | |
| 1966.06.02 | Archbishop of Aleppo of the Maronites (Syria) (1954.04.16 – 1966.06.02) |
| 1966.06.07 | Bishop emeritus of Saint-Brieuc (France) (1949.03.20 – 1961.01.19) |
| 1966.06.16 | Metropolitan Archbishop emeritus of Cape Coast (Ghana) (1950.04.18 – 1959.05.15) |
| 1966.06.18 | Vicar Apostolic emeritus of Kimberley in Western Australia (Australia) (1935.06.18 – 1958.08) |
| 1966.06.21 | Bishop of Krk (Croatia) (1923.09.15 – 1966.06.21) Archbishop ad personam (1963.03.02 – 1966.06.21) |
| 1966.06.22 | |
| 1966.06.26 | Bishop emeritus of Paraná (Argentina) (1927.07.07 – 1934.04.20) |
| 1966.07.03 | |
| 1966.07.09 | |
| 1966.07.11 | Bishop of Gualeguaychú (Argentina) (1957.03.13 – 1966.07.11) |
| 1966.07.14 | Metropolitan Archbishop of Guiyang 貴陽 (China) (1946.04.11 – 1966.07.14) |
| 1966.07.14 | Chancellor of Apostolic Briefs of Secretariat of State (1960 – 1966.07.14) |
| 1966.07.19 | Cardinal-Deacon of S. Apollinare alle Terme Neroniane-Alessandrine (1962.03.22 – 1966.07.19) Prefect emeritus of Vatican Apostolic Library (1936 – 1962.03.19) |
| 1966.07.21 | Bishop emeritus of Jujuy (Argentina) (1934.09.13 – 1965.08.09) |
| 1966.07.27 | |
| 1966.07.28 | |
| 1966.08.06 | Titular Archbishop of Apamea in Syria (1948.08.07 – 1966.08.06) |
| 1966.08.09 | Bishop-Prelate emeritus of Roraima (Brazil) (1952.04.18 – 1965) |
| 1966.08.12 | |
| 1966.08.26 | Vicar Apostolic of Bermuda Islands (Bermuda) (1956.01.28 – 1966.08.26) |
| 1966.08.31 | Metropolitan Archbishop of Izmir (Turkiye) (1965.11.04 – 1966.08.31) |
| 1966.09.19 | |
| 1966.09.20 | Metropolitan Archbishop of Maseru (Lesotho) (1961.01.03 – 1966.09.20) |
| 1966.09.21 | Bishop of Castellammare di Stabia (Italy) (1952.03.29 – 1966.09.21) |
| 1966.09.22 | Bishop of Cleveland (USA) (1945.11.02 – 1966.09.22) Archbishop ad personam (1951.07.23 – 1966.09.22) |
| 1966.09.22 | Bishop of Valleyfield (Canada) (1926.07.10 – 1966.09.22) |
| 1966.10.03 | Vicar Apostolic of Labrador (Canada) (1946.03.14 – 1966.10.03) |
| 1966.10.08 | Auxiliary Bishop of Montréal (Canada) (1941.06.28 – 1966.10.08) |
| 1966.10.12 | Metropolitan Archbishop of Nueva Segovia (Philippines) (1951.06.29 – 1966.10.12) |
| 1966.10.16 | Bishop of Bacolod (Philippines) (1952.03.05 – 1966.10.16) |
| 1966.10.25 | |
| 1966.11.05 | Auxiliary Bishop of Münster (Germany) (1936.03.07 – 1966.11.05) |
| 1966.11.17 | Metropolitan Archbishop emeritus of Urbino (Italy) (1932.05.01 – 1952.12.31) |
| 1966.11.22 | |
| 1966.11.24 | |
| 1966.11.26 | Abbot Ordinary emeritus of Peramiho (Tanzania) (1931.12.23 – 1952.12.06) |
| 1966.12.06 | Archbishop emeritus of Marseille (France) (1948.01.31 – 1956.09.05) |
| 1966.12.08 | Bishop of Keimoes (South Africa) (1962.09.12 – 1966.12.08) |
| 1966.12.19 | |
| 1966.12.19 | |
| 1966.12.21 | Archbishop of Ancona e Umana (Italy) (1945.11.18 – 1966.12.21) |
| 1966.12.23 | |
| 1966.12.25 | Bishop emeritus of Kigoma (Tanzania) (1953.03.25 – 1957.11.22) |
| 1966.12.30 | Cardinal-Priest of S. Lorenzo in Lucina (1964.09.26 – 1966.12.30) President of Pontifical Commission for the Revision of the Code of Canon Law (1955.05.31 – 1966.12.30) Prefect of Sacred Congregation of the Council (1954.03.20 – 1966.12.30) |
| 1966.12.30 | Bishop-Prelate of Moyobamba (Peru) (1949.01.15 – 1966.12.30) |
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