Joachim I (Bulgarian: Йоаким I) was the Patriarch of the Bulgarian Orthodox Church between 1235 and 1246. He was the first head of the restored Bulgarian Patriarchate with seat in Tarnovo, the capital of the Second Bulgarian Empire. Joachim I died of natural death on 18 January 1246 and was proclaimed a saint. He was the founder of an extensive monastic complex known as the Rock-hewn Churches of Ivanovo, now included in the UNESCO World Heritage List.