The Diocese of Kaià ¡iadorys () is a Latin Catholic diocese located in the city of Kaià ¡iadorys in the Ecclesiastical Province of Vilnius in Lithuania. It was established on 4 April 1926 from the Metropolitan Archdiocese of Vilnius.
(all Roman Rite)
Between 1982 and 1991, Kaià ¡iadorys was led by Apostolic Administrators rather than bishops.