The Roman Catholic Diocese of Kaišiadorys () is a diocese located in the city of Kaišiadorys in the Ecclesiastical Province of Vilnius in Lithuania. It was established on 4 April 1926 from the Metropolitan Archdiocese of Vilnius.
Episcopal ordinaries
(all Roman Rite)
Bishops
Juozapas Kukta (5 April 1926 – 16 June 1942 Died) Teofilius Matulionis (9 January 1943 – 20 August 1962 Died) Juozapas Matulaitis-Labukas (24 December 1991 – 11 February 2012 Retired) Jonas Ivanauskas (11 February 2012 – )
Apostolic administrators
Between 1982 and 1991, Kaišiadorys was led by Apostolic Administrators rather than bishops. Vincentas Sladkevičius, MIC (15 July 1982 – 10 March 1989) Juozapas Matulaitis-Labukas (10 March 1989 – 24 December 1991)