Rothesay Bay is a small suburb in Auckland's East Coast Bays region. The suburb is roughly the same size as Murrays Bay, the suburb to the immediate south.

East Coast Bays is a string of small suburbs that form the northernmost part of the North Shore, part of the contiguous Auckland metropolitan area in New Zealand. The suburbs line the north-east coast of the city along the shore of the Hauraki Gulf and Rangitoto Channel. They include, from north to south, Long Bay, Torbay, Waiake Bay, Browns Bay, Rothesay Bay, Murrays Bay, Mairangi Bay, Campbells Bay and Castor Bay. Most of the East Coast Bays are covered under the East Coast Bays subdivision of the Hibiscus and Bays local board area.