Pachomius the Serb (Russian: Пахомий Серб; Serbian: Пахомије Србин), also known as Pachomius Logothetes (Russian: Пахомий Логофет; Greek: Παχώμιος Λογοθέτης), was a 15th-century Serbian hagiographer who, after taking monastic vows, was schooled on Mount Athos and mastered the ornate style of medieval Serbian literature.

[1]: 166–177  He is credited by the Russian Early Texts Society for the Serbian version of Barlaam and Josaphat from Old Greek.

In about 1470 Archbishop Jonah (Iona) asked him to settle in Novgorod where he prepared a set of the lives of local saints.

"[1]: 167  He then travelled to the Troitse-Sergiyeva Lavra north of Moscow, where he composed the Life of Sergius of Radonezh, the founder of that monastery.

He returned to Novgorod under Archbishop Jonah (1458–1470) and composed the Lives of several Novgorodian bishop-saints, including those of Elias (John) and Euthymius II.