Mou Waho is a 120-hectare island in Lake Wānaka, New Zealand.

[1] It is around the same size as the nearby Mou Tapu, these two islands being the largest in the lake.

[2] Buff weka thrive on the island are predators of much of the native wildlife including mountain stone wētā, cave wētā, and Southern Alps geckos.

[3] For this reason students of the local Mount Aspiring College built 40 small wooden motels for these animals to safely live in.

It was officially renamed Harwich Island in 1925[6] in honour of the Royal Navy's Harwich Force[5]but the name did not gain wide acceptance[5] and was renamed Mou Waho in 1988 after documents from the 1920s were found attesting to the original te reo Māori name.