Wairau

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