HMS Waterwitch was a British hydrographic survey vessel active in eastern Asian waters from 1894 to 1912. She was a wooden vessel, purchased from a private owner specifically for survey work. She was lost in a collision in Singapore harbour in 1912.

Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas, coastal areas, lakes and rivers, as well as with the prediction of their change over time, for the primary purpose of safety of navigation and in support of all other marine activities, including economic development, security and defense, scientific research, and environmental protection.