Lake Rototoa (formerly Lake Ototoa) is located at the northern end of the south head of the Kaipara Harbour in the Rodney ward of the Auckland Region, New Zealand.

[2] With a surface area of 1.39 km2 and a maximum depth of 26 m, it is the largest and deepest of a series of sand-dune lakes found along the western coastline of the North Island.

[4] Rototoa translates as 'Lake of the Warrior', and is part of a line of lakes known as 'the Footsteps of Kawharu' after the warrior Kawharu who fought with the Ngāti Whātua tribe against the resident Waiohua, Ngaririki and Kawerau tribes in the late 17th to early 18th centuries.

The lake is vegetated with Typha orientalis and Eleocharis sphacelata.

This Auckland Region-related geography article is a stub.