Nathaniel Wallich FRS (28 January 1786 – 28 April 1854) was a medical doctor and botanist from Denmark. He worked in India; firstly in the Danish settlement near Calcutta and later for the East India Company. He was involved in the early development of the Calcutta Botanical Garden, describing many new plant species and developing a large collection with copies that he gave to collections in Europe. Several of the plants that he collected were named after him.