Ioachim Chronicle (also Joachim, Ioakim Chronicle) is a chronicle discovered by Vasily Tatishchev in 18th century. The chronicle is belived to be a 17th century compilation of earlier sources. It describes the events before 10th century on the territories where Novgorod Republic and Kievan Rus later formed.
The original chronicle was lost and the contents are known through Tatischev's publication "History of Russia". Tatischev believed that the chronicle was written by Ioachim of Chersonesos (d. 1030), but later studies showed that the chronicle was likely compiled by Patriarch Ioachim (d. 1690).
There is substantial doubt over chronicle's authenticity, particularly in respect to earlier events.