Lake Tatawai was a tidal freshwater lake located immediately north of Lake Waipori in Otago, in New Zealand's South Island.

[1] It is one of the historical lakes that was drained soon after European Settlement of the Taieri Plains.

Lake Tatawai drained into Lake Waipori by a small channel, and ultimately into the Taieri.

It was a very shallow lake and would have originally been surrounded by wetlands.

This Otago geography article is a stub.