The Diocese of Ełk (Latin: Dioecesis Liccanensis) is a Latin Church diocese of the Catholic Church located in the city of Ełk in the ecclesiastical province of Warmia in Poland.

• March 25, 1992: Established as Diocese of Ełk from the Diocese of Łomża and Diocese of Warmia

• Cathedral: Katedra św. Wojciecha, Ełk (St. Wojciech Cathedral)
• Co-Cathedral: Konkatedra NMP Matki Kościoła, Gołdap (Our Lady Mother of Church Concathedral)
• Co-Cathedral: Konkatedra św. Aleksandra, Suwałki (St. Alexander Concathedral)
• Minor Basilica: Bazylika Najświętszego Serca Jezusowego, Augustów (Most Holy Heart of Jesus Basilica)

• Bishops of Ełk (Roman rite)
  • Bishop Wojciech Ziemba (1992.03.25 – 2000.11.16), appointed Archbishop of Białystok
  • Bishop Edward Samsel (2000.11.16 – 2003.01.17)
  • Bishop Jerzy Mazur, S.V.D. (since 2003.04.17)

• Romuald Kamiński (2005-2017), appointed Coadjutor Bishop of Warszawa-Praga
• Adrian Joseph Galbas, S.A.C. (2020-2022) appointed Coadjutor Archbishop of Katowice
• Dariusz Zalewski (since 2022.10.29)

• Roman Catholicism in Poland

• GCatholic.org
• Catholic Hierarchy
• Diocese website

53°49′13″N 22°21′17″E / 53.820359°N 22.354720°E / 53.820359; 22.354720