Weapons are Items used for battle in all of the Phantasy Star Online games. The weapons which a Character can equip are determined by their Class. In the original Phantasy Star Online, characters could equip every weapon pertaining to their type, while all classes could equip a select few Hunter and Ranger weapons. In Phantasy Star Online 2, every class could equip a select few with Gunslashes also available to them all.

In PSO and PSO2, all weapons are items that can be equipped through the inventory. In Phantasy Star Online Episode III: C.A.R.D. Revolution, weapons were a subcategory of Item Cards that could only be equipped by the Hunters.

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