The Bay of Plenty or Te Moana-a-Toi (Māori) is a large bight in the northern coast of New Zealand's North Island. It stretches from the Coromandel Peninsula in the west to Cape Runaway in the east, a wide stretch of some 259 km of open coastline. The Bay of Plenty Region is situated around this body of water, also incorporating several large islands in the bay. The bay was named by James Cook after he noticed the abundant food supplies at several Māori villages there, in stark contrast to the earlier observations he had made in Poverty Bay.

According to local Māori traditions, the Bay of Plenty was the landing point of several migration canoes that brought Māori settlers to New Zealand. These include the Mataatua, Nukutere, Tākitimu, Arawa and Tainui canoes.

The present Bay of Plenty region was formed in 1989 after a nationwide review and shakeup of top-level local government in New Zealand. The new region incorporated the former counties of Tauranga, Rotorua, Whakatane and Opotiki.

On 5 October 2011, the MV Rena ran aground on the Astrolabe Reef in the bay causing a large oil spill, described as New Zealand's worst ever environmental disaster.

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