The Lady Knox Geyser is a geyser in the Waiotapu area of the Taupo Volcanic Zone in New Zealand. It is named after Lady Constance Knox, the second daughter of Uchter Knox, 15th Governor of New Zealand. The geyser is induced to erupt daily at 10:15am by dropping a surfactant into the opening of the vent. Eruptions produce a jet of water reaching up to 20m and can last for over an hour, depending on the weather.