Wairau may refer to:
Wairau (New Zealand electorate), parliamentary electorate in the Marlborough Region of New Zealand Wairau Bar, a gravel bar formed where the Wairau River meets the sea in Cloudy Bay, Marlborough, New Zealand Wairau Fault, an active fault in the northeastern part of South Island, New Zealand Wairau River, Marlborough, New Zealand Wairau Valley, Marlborough, New Zealand Wairau Valley, Auckland, New Zealand Wairau Affray, an 1843 conflict in the New Zealand Land Wars