Shediac Bay is a tidal embayment, an extension of the Northumberland Strait in New Brunswick, Canada.

The bay contains Shediac Harbour which is a popular touristic, boating and fishing area.

The Canadian Coast Guard maintain an inshore rescue boat station (CCG IRB Shediac) at Pointe du Chêne.

The population of the island was once composed of Micmac and Acadian Wabanaki soldiers.

[1] The bay was a stopover location for Italo Balbo's transatlantic mass flight in 1933.