Aghios Nikolaos (Greek: Άγιος Νικόλαος Μεσσηνίας), Agios Nikolaos or Saint Nicholas, is a fishing village in the Mani Peninsula in southern Greece about 30 kilometres (19 mi) south-east of Kalamata, on the eastern shore of the Messenian Gulf, and about 4 kilometres (2.5 mi) south of Stoupa, a larger tourist village.

It is part of the municipality of West Mani in Messenia.

There are Byzantine churches in the hills above the town.

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