| Date | Country | Change |
| 1927 | Titular Episcopal See of Cartennæ was established | |
| 1927 | Titular Episcopal See of Mina was established | |
| 1927 | Titular Episcopal See of Zabi was established | |
| 1927 | Titular Episcopal See of Zattara was established | |
| 1927 | Titular Episcopal See of Calydon was established | |
| 1927 | Titular Archiepiscopal See of Cassiope was suppressed | |
| 1927 | Titular Episcopal See of Hierisus was established | |
| 1927 | Titular Episcopal See of Nysirus was restored | |
| 1927 | Titular Episcopal See of Oreus was established | |
| 1927 | Titular Episcopal See of Thaumacus was renamed as Titular Episcopal See of Thaumacus | |
| 1927 | Titular Episcopal See of Cæsarea (Greek-Melkite Rite) was established | |
| 1927 | Apostolic Administration of Ibiza was restored (from Diocese of Mallorca) | |
| 1927 | Titular Episcopal See of Constantia was renamed as Titular Episcopal See of Constantia | |
| 1927 | Titular Episcopal See of Hemesa (Maronite Rite) was suppressed | |
| 1927 | Titular Episcopal See of Semta was established | |
| 1927 | Titular Episcopal See of Sululos was established | |
| 1927 | Titular Episcopal See of Vazari was established | |
| 1927 | Titular Episcopal See of Cadi was established | |
| 1927 | Titular Episcopal See of Hadrianopolis was renamed as Titular Episcopal See of Hadrianopolis | |
| 1927 | Titular Archiepiscopal See of Nisibis (Chaldean Rite) was suppressed | |
| 1927 | Titular Episcopal See of Olba was suppressed | |
| 1927 | Titular Episcopal See of Pegæ was renamed as Titular Episcopal See of Pegæ | |
| 1927 | Titular Episcopal See of Ioppe (Syriac Rite) was suppressed | |
| 1927 | Titular Episcopal See of Oropus was renamed as Titular Episcopal See of Oropus | |
| 1927 | Titular Episcopal See of Ticelia was suppressed | |
| 1927.01.17 | Diocese of Santa Catarina was promoted as Metropolitan Archdiocese of Florianópolis (with suffragan sees Joinville and Lages and lost territory to establish Diocese of Joinville and Diocese of Lages) | |
| 1927.01.17 | Diocese of Joinville was established (from Diocese of Santa Catarina and became suffragan of Florianópolis) | |
| 1927.01.17 | Diocese of Lages was established (from Diocese of Santa Catarina and became suffragan of Florianópolis) | |
| 1927.02.03 | Apostolic Prefecture of Jiangmen 江門 was promoted as Apostolic Vicariate of Jiangmen 江門 | |
| 1927.02.03 | Apostolic Vicariate of Cirenaica was established (from Apostolic Vicariate of Libya) | |
| 1927.02.03 | Apostolic Vicariate of Libya was renamed as Apostolic Vicariate of Tripolitana (lost territory to establish Apostolic Vicariate of Cirenaica) | |
| 1927.02.05 | Apostolic Prefecture of Labuan and Borneo was renamed as Apostolic Prefecture of Northern Borneo (lost territory to establish Apostolic Prefecture of Sarawak) | |
| 1927.02.05 | Apostolic Prefecture of Sarawak was established (from Apostolic Prefecture of Labuan and Borneo) | |
| 1927.02.14 | Diocese of Treviso lost territory to Patriarchal See of Venezia | |
| 1927.03.15 | Apostolic Vicariate of Athabaska was renamed as Apostolic Vicariate of Grouard (exchanged territory with Apostolic Vicariate of Mackenzie) | |
| 1927.03.15 | Apostolic Vicariate of Mackenzie exchanged territory with Apostolic Vicariate of Athabaska | |
| 1927.03.17 | Apostolic Prefecture of Hpyeng-yang was established (from Apostolic Vicariate of Seoul 서울) | |
| 1927.03.18 | Apostolic Prefecture of Kagoshima 鹿児島 was established (from Diocese of Nagasaki 長崎 and became suffragan of Tokyo 東京) | |
| 1927.04.07 | Apostolic Prefecture of Lulua Katanga exchanged territory with Apostolic Prefecture of Northern Katanga | |
| 1927.04.07 | Apostolic Prefecture of Northern Katanga exchanged territory with Apostolic Prefecture of Lulua Katanga | |
| 1927.04.27 | Apostolic Prefecture of Nanlong 南龍 was promoted as Apostolic Vicariate of Nanlong 南龍 | |
| 1927.04.27 | Apostolic Prefecture of Coquilhatville exchanged territory with Apostolic Vicariate of Léopoldville | |
| 1927.04.27 | Apostolic Vicariate of Léopoldville exchanged territory with Apostolic Prefecture of Coquilhatville | |
| 1927.04.27 | Apostolic Prefecture of Malang was established (from Apostolic Vicariate of Batavia) | |
| 1927.04.27 | Apostolic Prefecture of Kengtung was established (from Apostolic Vicariate of Eastern Burma) | |
| 1927.04.27 | Apostolic Vicariate of Eastern Burma was renamed as Apostolic Vicariate of Toungoo (lost territory to establish Apostolic Prefecture of Kengtung) | |
| 1927.05.01 | Apostolic Prefecture of Tumaco was established (from Diocese of Cali and Diocese of Pasto) | |
| 1927.05.25 | Diocese of Chittagong was established (from Diocese of Dacca and became suffragan of Calcutta) | |
| 1927.05.25 | Diocese of Dinajpur was established (from Diocese of Krishnagar and became suffragan of Calcutta) | |
| 1927.05.25 | Diocese of Ranchi was established (from Metropolitan Archdiocese of Calcutta and became suffragan of Calcutta) | |
| 1927.06.05 | Diocese of Catanzaro was promoted as Archdiocese of Catanzaro | |
| 1927.06.24 | Mission sui juris of Linqing 臨清 was established (from Apostolic Vicariate of Jinanfu 濟南府) | |
| 1927.06.29 | Diocese of Boiano was renamed as Diocese of Boiano–Campobasso | |
| 1927.07.14 | Apostolic Prefecture of Hanyang 漢陽 was promoted as Apostolic Vicariate of Hanyang 漢陽 | |
| 1927.07.14 | Apostolic Prefecture of Bahr el-Gebel was established (from Apostolic Prefecture of Equatorial Nile) | |
| 1927.07.14 | Apostolic Prefecture of Broken Hill was established (from Apostolic Prefecture of Zambese) | |
| 1927.07.14 | Apostolic Prefecture of Zambese was renamed as Apostolic Prefecture of Salisbury (lost territory to establish Apostolic Prefecture of Broken Hill) | |
| 1927.07.16 | Diocese of Fukuoka 福岡 was established (from Diocese of Nagasaki 長崎 and became suffragan of Tokyo 東京) | |
| 1927.09.22 | Diocese of Borgo San Donnino was renamed as Diocese of Fidenza | |
| 1927.12.15 | Apostolic Prefecture of Bobo-Dioulasso was established (from Apostolic Vicariate of Bamako and Apostolic Vicariate of Ouagadougou) | |
| 1927.12.15 | Apostolic Prefecture of Xinyangzhou 信陽州 was established (from Apostolic Vicariate of Kaifengfu 開封府) | |
| 1927.12.15 | Apostolic Prefecture of Benadir was promoted as Apostolic Vicariate of Mogadishu | |
| 1927.12.15 | Apostolic Prefecture of Lindi was promoted as Territorial Abbacy of Lindi |
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