| Date of Death | Deceased Bishops (86) |
| 1978 | Metropolitan Archbishop emeritus of Jinan 濟南 (China) (1958 – 1963▼) |
| 1978 | Metropolitan Archbishop emeritus of Chongqing 重慶 (China) (1963 – ?▼) |
| 1978 | |
| 1978.01.15 | Bishop of Shaoguan 韶關 (China) (1962 – 1978.01.15▼) |
| 1978.01.16 | Bishop emeritus of Valva (Italy) (1937.03.14 – 1972.01.29) Bishop emeritus of Sulmona (Italy) (1937.03.14 – 1972.01.29) |
| 1978.01.17 | Assessor for General Affairs emeritus of Secretariat of State (1967 – 1970.07.16) |
| 1978.01.17 | Auxiliary Bishop of Katowice (Poland) (1937.03.13 – 1978.01.17) |
| 1978.02.02 | Bishop emeritus of Venosa (Italy) (1935.04.01 – 1966.10.05) Bishop emeritus of Rapolla (Italy) (1935.04.01 – 1966.10.05) |
| 1978.02.07 | |
| 1978.02.10 | Bishop-Prelate emeritus of Chuquibamba (Peru) (1962.06.05 – 1977.02) |
| 1978.02.13 | |
| 1978.02.17 | Vicar Apostolic emeritus of Central Norway (Norway) (1953.02.04 – 1974.03.25) |
| 1978.02.19 | Bishop of Nanyang 南陽 (China) (1946.04.11 – 1978.02.19) |
| 1978.02.23 | Cardinal-Priest of S. Maria in Via (1973.03.05 – 1978.02.23) Metropolitan Archbishop of Osaka 大阪 (Japan) (1969.06.24 – 1978.02.23) |
| 1978.02.23 | Bishop emeritus of Tanga (Tanzania) (1958.02.24 – 1969.12.15) |
| 1978.02.28 | |
| 1978.03.01 | Metropolitan Archbishop emeritus of Pamplona (Spain) (1946.10.26 – 1968.07.23) |
| 1978.03.02 | Metropolitan Archbishop emeritus of Mérida (Venezuela) (1927.08.01 – 1966.11.22) |
| 1978.03.03 | Auxiliary Bishop of Wrocław (Poland) (1973.11.01 – 1978.03.03) |
| 1978.03.09 | |
| 1978.03.11 | Bishop emeritus of Mazara del Vallo (Italy) (1963.12.26 – 1977.03.21) |
| 1978.03.12 | Bishop emeritus of Luxembourg (Luxembourg) (1956.10.21 – 1971.02.13) |
| 1978.03.17 | Cardinal-Deacon of S. Eustachio (1969.04.30 – 1978.03.17) Patron of Sovereign Military Hospitaller Order of Saint John of Jerusalem of Rhodes and of Malta (Knights of Malta) (1969.07.03 – 1978.03.17) |
| 1978.03.18 | Bishop of Terlizzi (Italy) (1935.10.17 – 1978.03.18) Bishop of Molfetta (Italy) (1935.10.17 – 1978.03.18) Bishop of Giovinazzo (Italy) (1935.10.17 – 1978.03.18) |
| 1978.03.31 | Bishop emeritus of Iglesias (Italy) (1930.07.22 – 1970.09.07) |
| 1978.04.10 | Bishop emeritus of Nampula (Mozambique) (1951.03.02 – 1966.11.30) |
| 1978.04.13 | Vicar Apostolic of Alexandria of Egypt (Egypt) (1949.05.26 – 1978.04.13) |
| 1978.04.14 | Bishop emeritus of Tiruchirapalli (India) (1950.10.21 – 1970.11.23) |
| 1978.04.15 | Bishop emeritus of Steubenville (USA) (1945.03.10 – 1977.09.27) |
| 1978.04.16 | Archbishop of Canberra and Goulburn (Australia) (1967.04.13 – 1978.04.16) |
| 1978.04.24 | Bishop emeritus of Casale Monferrato (Italy) (1940.07.01 – 1971.03.01) |
| 1978.04.29 | Bishop emeritus of Khulna (Bangladesh) (1956.08.03 – 1969.03.20) |
| 1978.05.05 | Metropolitan Archbishop of San Fernando (Philippines) (1975.03.17 – 1978.05.05) |
| 1978.05.06 | |
| 1978.05.10 | |
| 1978.05.13 | |
| 1978.05.16 | Metropolitan Archbishop of Shenyang 瀋陽 (China) (1949.07.26 – 1978.05.16) |
| 1978.05.26 | Bishop emeritus of Colima (Mexico) (1949.06.30 – 1967.07.25) |
| 1978.05.27 | Metropolitan Archbishop of Rabaul (Papua New Guinea) (1966.11.15 – 1978.05.27) |
| 1978.05.31 | |
| 1978.06.07 | |
| 1978.06.13 | Bishop of Trivandrum (India) (1966.10.01 – 1978.06.13) |
| 1978.06.21 | Bishop emeritus of Shillong (India) (1935.11.26 – 1969.06.26) |
| 1978.06.24 | Bishop emeritus of Lahore (Pakistan) (1967.03.12 – 1975.07.10) |
| 1978.06.26 | Auxiliary Bishop emeritus of Osnabrück (Germany) (1950.04.08 – 1975) |
| 1978.06.28 | Bishop of Oradea Mare of the Romanians (Romania) (1952 – 1978.06.28) |
| 1978.07.06 | |
| 1978.07.07 | Bishop-Prelate emeritus of Vacaria (Brazil) (1936.06.27 – 1957.01.18) Auxiliary Bishop of Caxias do Maranhão (Brazil) (1957.01.18 – 1978.07.07) |
| 1978.07.08 | |
| 1978.07.11 | |
| 1978.07.16 | Auxiliary Bishop emeritus of Brooklyn (USA) (1952.03.28 – 1977.10) |
| 1978.07.16 | Auxiliary Bishop of Armagh (Northern Ireland) (1974.05.03 – 1978.07.16) |
| 1978.07.18 | |
| 1978.07.25 | Metropolitan Archbishop emeritus of Puerto Montt (Chile) (1963.05.10 – 1970.05.18) |
| 1978.07.28 | Auxiliary Bishop of Székesfehérvár (Hungary) (1978.03.02 – 1978.07.28) |
| 1978.08.06 | Supreme Pontiff (1963.06.21 [1963.06.30] – 1978.08.06) |
| 1978.08.06 | Archbishop emeritus of Ancona e Umana (Italy) (1967.02.22 – 1968.07.06) |
| 1978.08.10 | Bishop of Abengourou (Cote d’Ivoire) (1963.09.13 – 1978.08.10) |
| 1978.08.12 | Bishop emeritus of Civita–Tempio (Italy) (1951.12.29 – 1961.02.10) Bishop emeritus of Ampurias (Italy) (1951.12.29 – 1961.02.10) |
| 1978.08.16 | Cardinal-Priest of Gesù Divin Lavoratore (1969.04.30 – 1978.08.16) Metropolitan Archbishop of Nanjing 南京 (China) (1946.04.11 – 1978.08.16) |
| 1978.08.22 | Metropolitan Archbishop emeritus of Mbandaka–Bikoro (Congo-Kinshasa) (1975.04.12 – 1977.11.11) |
| 1978.08.28 | Bishop of Middlesbrough (England) (1967.06.13 – 1978.08.28) |
| 1978.09.08 | Auxiliary Bishop of the Military Vicariate of United States of America (USA) (1975.11.04 – 1978.09.08) |
| 1978.09.11 | Cardinal-Priest of S. Maria in Via Lata pro hac vice Title (1953.01.15 – 1978.09.11) Metropolitan Archbishop of Bombay (India) (1950.12.04 – 1978.09.11) |
| 1978.09.11 | Bishop of Bragança e Miranda (Portugal) (1965.02.20 – 1978.09.11) |
| 1978.09.12 | |
| 1978.09.13 | Metropolitan Archbishop emeritus of Liverpool (England) (1964.01.29 – 1976.02.07) |
| 1978.09.20 | Bishop of Bondo (Congo-Kinshasa) (1970.09.01 – 1978.09.20) |
| 1978.09.22 | |
| 1978.09.28 | Supreme Pontiff (1978.08.26 [1978.09.03] – 1978.09.28) |
| 1978.10.01 | Bishop emeritus of Lucena (Philippines) (1959.06.21 – 1976.09.25) |
| 1978.10.10 | Metropolitan Archbishop emeritus of Mandalay (Myanmar) (1965.08.09 – 1978.09.25) |
| 1978.10.14 | Cardinal-Deacon of S. Giovanni Bosco in Via Tuscolana (1976.05.24 – 1978.10.14) Dean emeritus of Sacred Roman Rota (1967.06.26 – 1976.05.01) |
| 1978.10.18 | Metropolitan Archbishop emeritus of Bahía Blanca (Argentina) (1957.02.11 – 1972.05.31) |
| 1978.10.25 | Metropolitan Archbishop of Anqing 安慶 (China) (1946.04.11 – 1978.10.25) |
| 1978.11.09 | Vicar Apostolic emeritus of Kuwait (Kuwait) (1954.12.02 – 1966.03) |
| 1978.11.21 | Bishop emeritus of Moshi (Tanzania) (1960.01.12 – 1966.11.03) |
| 1978.11.27 | Cardinal-Priest of S. Francesco di Paola ai Monti pro hac vice Title (1976.05.24 – 1978.11.27) Metropolitan Archbishop of Hà Nôi (Vietnam) (1960.11.24 – 1978.11.27) |
| 1978.12.08 | Archbishop emeritus of Catania (Italy) (1952.04.03 – 1974.07.16) |
| 1978.12.13 | |
| 1978.12.14 | Bishop of Saint Petersburg (USA) (1968.05.02 – 1978.12.14) |
| 1978.12.16 | Bishop emeritus of Montpellier (France) (1958.02.24 – 1976.05.15) |
| 1978.12.17 | Cardinal-Priest of S. Giovanni a Porta Latina (1946.02.22 – 1978.12.17) Metropolitan Archbishop emeritus of Köln (Germany) (1942.05.01 – 1969.02.10) |
| 1978.12.19 | Metropolitan Archbishop emeritus of Zaragoza (Spain) (1964.05.20 – 1977.06.03) |
| 1978.12.25 | Metropolitan Archbishop of Philadelphia of the Ukrainians (USA) (1977.09.20 – 1978.12.25) |
| 1978.12.31 | Minister General emeritus of Order of Friars Minor (Franciscans) (1952 – 1965.10.02) |
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