The Diocese of Krk is a Latin Church ecclesiastical territory or diocese of the Catholic Church active on the Croatian islands of Krk, Rab, Cres and Lošinj, as well as a few smaller ones and also a mission serving the Croatian people of New York: Blessed Ivan Merz in Astoria NY under the Brooklyn Diocese. The diocese is centred in the town of Krk. It was first erected in 900.