The Singitic Gulf (Greek: Σιγγιτικός Κόλπος, romanized: Singitikos Kolpos), also known as the Mount Athos Gulf or the Holy Mountain Gulf (Greek: Κόλπος Αγίου Όρους, romanized: Kolpos Agiou Oros) is a gulf of the Thracian Sea, part of the northern Aegean Sea, in Chalkidiki, Greece.

[1] It is bounded by Sithonia in the west, and Mount Athos in the east.

The island of Ammouliani sits in the northeastern portion of the gulf along Mount Athos.

[2] Many of the monasteries of Mount Athos lie along the shore of the Singitic Gulf.

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