The Pagasetic Gulf () is a rounded gulf with a maximum depth of in the Magnesia regional unit of east-central Greece. It is formed by the Pelion peninsula and is connected to the Euboic Sea through a narrow channel about 4 km wide.
Its main port and largest city is Volos.
The gulf is named after its historic major port, Pagasae, from which mythology says that Jason built his ship the Argo and from which he sailed on his adventurous voyage.
The gulf's name in Latin was Pagasaeus Sinus.
In clockwise order:
The gulf takes its name from the ancient city of Pagasae.