Nototropis falcatus is a species of amphipod crustacean. It is whitish in colour, with brown patches, and grows to a total length of around 7 millimetres (0.28 in). It lives in fine sand at depths of 10–50 metres (33–164 ft), from northern Norway to the west coast of Ireland, including the North Sea, and as far south as the southern Bay of Biscay.