Agios Ioannis (Greek: Άγιος Ιωάννης, lit. 'St. John's'), also known as Aghios Ioannis on signage, is a station on Athens Metro Line 2. The station opened on 15 November 2000, as part of the extension from Syntagma to Dafni.

The station was part of the original Athens Metro plan that was approved in 1991. It opened on 15 November 2000 along with the Syntagma-Dafni extension, 10 months after the first section of the system opened.

G Ground	-	Exits
C Concourse	Concourse	Customer Service, Tickets
P Platforms	Side platform, doors will open on the right
	Platform 1	← towards Anthoupoli (Neos Kosmos)
	Platform 2	→ towards Elliniko (Dafni) →
	Side platform, doors will open on the right

The station can be reached by two entrances, both on Agios Ioannis Square. The one is located near Kasomouli street and the other near Pytheou street. There is also an elevator located on the square.

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  Sign on Agios Ioannis Square
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  Entrance at Kasomouli street
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  Entrance at Pytheou street
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  The station's concourse level
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  Station's sign on the platforms