On March 25, 1798, it lost territory to establish the Diocese of Wigry and became a suffragan see of the Archdiocese of Mohilev (until 1926). On July 3, 1848, it gained territory from the persisting then Diocese of Vilnius, now Lithuania's other Metropolitan see. On June 9, 1920, it lost territory to the existing Diocese of Riga (in Latvia), while in the next year it gained territory from the persisting Diocese of Sejny (in Poland).
It enjoyed a Papal Visit from Pope John Paul II in September 1993. On May 28, 1997, parts of the archdiocese have been ceded to the newly founded suffragan Diocese of Šiauliai.
Stanislovas Kiška (Stanisław Kiszka) (1618.11.26 – death 1626.02.13)
Abraomas Voina (Abraham Woyna) (1626.07.20 – 1631.03.24), previously Titular Bishop of Modon (1611.05.25 – 1626.07.20) & Auxiliary Bishop of Vilnius (Lithuania) (1611.05.25 – 1626.07.20); later Bishop of Vilnius (1631.03.24 – death 1649.04.14)
Merkelis Elijaševičius Geišas (Melchior Elijaszewicz Geisz) (1631.06.11 – death 1633.01.28)
Jurgis Tiškevičius (Jerzy Tyszkiewicz) (1633.12.19 – 1649.12.09), previously Titular Bishop of Modon (1627.05.17 – 1633.12.19) & Auxiliary Bishop of Vilnius (1627.05.17 – 1633.12.19); later Bishop of Vilnius (1649.12.09 – death 1656.01.17)
Petras Parčevskis (Piotr Parczewski) (1649.12.09 – death 1658.12.06), previously Bishop of Smolensk (Lithuania) (1636.09.01 – 1649.12.09)
Aleksandras Kazimieras Sapiega (Aleksander Kazimierz Sapieha) (1660.01.12 – 1667.07.18), previously Titular Bishop of Modon (1655.08.02 – 1660.01.12) & Auxiliary Bishop of Vilnius (Lithuania) (1655.08.02 – 1660.01.12); later Bishop of Vilnius (1667.07.18 – death 1671.05.22)
Kazimieras Pacas (Kazimierz Pac) (1667.10.03 – death 1695), previously Bishop of Smolensk (Lithuania) (1664.01.14 – 1667.10.03)
Jonas Jeronimas Krišpinas-Kiršenšteinas (Jan Hieronim Kryszpin-Kirszensztein) (1695.09.19 – death 1708.07.14), previously Titular Bishop of Martiria (1696.01.02 – 1706.01.25) & Auxiliary Bishop of Vilnius (1696.01.02 – 1710.07.21)
Jonas Mikalojus Zgierskis (Jan Mikołaj Zgierski) (1710.07.21 – death 1713.12.06), previously Titular Bishop of Martiria (1696.01.02 – 1706.01.25) & Auxiliary Bishop of Vilnius (Lithuania) (1696.01.02 – 1710.07.21) and next Bishop of Smolensk (Russia) (1706.01.25 – 1710.07.21)
Povilas Pranciškus Sapiega (Paweł Franciszek Sapieha), Cistercians (O. Cist.) (1715.01.21 – death 1715.10.01)
Aleksandras Mikalojus Gorainis (Aleksander Mikołaj Horain) (1716.12.07 – death 1735.12.07), previously Titular Bishop of Tiberias (1704.09.15 – 1711.12.23) & Auxiliary Bishop of Vilnius (1704.09.15 – 1711.12.23), Bishop of Smolensk (Russia) (1711.12.23 – 1716.12.07)
Juozapas Mykolas Karpis (Józef Michał Karp) (1736.11.19 – death 1739.12.10)
Antanas Tiškevičius (Antoni Dominik Tyszkiewicz) (1740.09.16 – death 1762.01.31), previously Titular Bishop of Mennith (1739.07.20 – 1740.09.16) & Auxiliary Bishop of Kijów–Czernihów (Poland) (1739.07.20 – 1740.09.16)
Dominykas Lopacinskis (Jan Dominik Łopaciński) (1762.04.19 – death 1778.01.11)
Jan Stefan Giedroyć (1778.03.30 – retired 1802.05.13), previously Titular Bishop of Verinopolis (1763.08.22 – 1765.04.22) & Auxiliary Bishop of Vilnius (1763.08.22 – 1765.04.22), Bishop of Inflanty (Latvia) (1765.04.22 – 1778.03.30)
Juozapas Arnulfas Giedraitis, longest serving Bishop of Samogitia
Juozapas Arnulfas Giedraitis (Józef Arnulf Giedroyć) (1802.05.13 – death 1838.07.17), succeeding as former Coadjutor Bishop of Samogitia ([1790.12.04] 1791.04.11 – 1802.05.13 & Titular Bishop of Orthosia (1791.04.11 – 1802.05.13)
Apostolic Administrator Simonas Mikalojus Giedraitis (Szymon Michal Józef Arnold Giedroyć) (1838.07.17 – 1844.08.07), former Titular Bishop of Adramyttium (1804.08.20 – 1838.07.17), Auxiliary Bishop of Samogitia (1804.08.20 – 1829.12) and Coadjutor Bishop of Samogitia (1829.12 – 1838.07.17, not formally succeeding)
Jonas Krizostomas Gintila (1844.08.07 – 1849.09.28 not possessed)
Motiejus Valančius (Maciej Kazimierz Wołonczewski) (1849.09.28 – death 1875.05.29)
Apostolic Administrator Aleksandras Kazimieras Beresnevičius (Aleksander Kazimierz Bereśniewicz) (1875.05.30 – 1883.03.15), Titular Bishop of Maximianopolis (1858.09.27 – 1883.03.15), former Auxiliary Bishop of Samogitia (1858.09.27 – 1875.05.30); later Bishop of Kujawy–Kalisz (Poland) (1883.03.15 – 1902.06.04)
ArchbishopJuozapas Skvireckas (1926.04.05 – death 1959.12.03), previously Titular Bishop of Ceramus & Auxiliary Bishop of Kaunas (1919.03.10 – 1926.04.05)
Archbishop Sigitas Tamkevičius, Society of Jesus (S.J.) (1996.05.04 – retired 2015.06.11), also President of Episcopal Conference of Lithuania (1999.11.03 – 2002.09.20), vice-president of Episcopal Conference of Lithuania (2002.09.20 – 2005.09.20), President of Episcopal Conference of Lithuania (2005.09.20 – 2014.10.28); previously Titular Bishop of Turuda & Auxiliary Bishop of Kaunas (1991.05.08 – 1996.05.04); as emeritus, became Cardinal-Priest of Sant'Angela Merici 10.05.2019
Archbishop Lionginas Virbalas, S.J. (2015 – retired 2019.03.01), also vice-president of Episcopal Conference of Lithuania (2014.10.28 – 2015.06.11); previously Bishop of Panevėžys (2013.06.06 – 2015.06.11)
↑In 1926 the diocesan structure of the Catholic Church was significantly modified by the papal bull Lituanorum gente. Indeed, with the new borders, only the ancient Diocese of Samogitia kept its seat within the new State, since the Diocese of Vilnius was then located on Polish territory: the Diocese of Samogitia became a metropolitan see as the "Archdiocese of Kaunas", having as suffragans the new dioceses of Telšiai, Vilkaviškis, Panevėžys, and Kaišiadorys (the latter comprising the remaining Lithuanian territories of the Diocese of Vilnius, which had become an archiepiscopal see in 1925). See the Bull Lituanorum gente, Acta Apostolicae Sedis 18 (1926), p. 121.