Anthim I (Bulgarian: Антим I, secular name Atanas Mihaylov Chalakov, Bulgarian: Aтанас Михайлов Чалъков; 1816 – 1 December 1888) was a Bulgarian education figure and clergyman, and a participant in the Bulgarian liberation and church-independence movement. He was the first head of the Bulgarian Exarchate, a post he held from 1872 to 1877. He was also the first Chairman of the National Assembly of Bulgaria, presiding the Constituent Assembly and the 1st Grand National Assembly in 1879. He was Archbishop of Preslav (from 1861) and then of Vidin (from 1868).