The Monastery of the Holy Apostles () is an Eastern Orthodox monastery in Kleino, Greece. It is located northeast of the settlement itself, on a plateau of difficult accessibility. The monastery was built approximately in the middle of the 18th century, its construction having been overseen by bishop Stagi Paisios. It is built in the style of the monasteries of Mount Athos.
The monastery features one of the oldest known inscriptions in the Aromanian language, which is the following: , meaning "Enter the church in awe, tremble as you receive the communion of Mary, to escape fire and hell". It is written using the Greek alphabet and it is estimated that it was made around the year 1780. This prayer is located on the interior of the arch of the entrance to the monastery and it is also written in Ancient and Modern Greek. Its author was St. Zosimas.