Diedrich Hermann Westermann (June 24, 1875-May 31, 1956) was a German missionary and linguist. He is seen as one of the founders of modern African linguistics. He was born and died in Baden near Bremen.

In 1927 he published a Practical Orthography of African Languages which became later known as the Westermann script.

Westermann has carried out extensive linguistic and anthropological research in the area ranging from Senegal eastwards to the Upper Nile. His linguistic publications cover a wide range of African languages (notably the Gbe languages, Nuer, Kpelle, Shilluk, Hausa, and Guang).

References

• Westermann, Diedrich H. (1948) The missionary and anthropological research Oxford University Press for the International African Institute.
• Westermann, Diedrich H. (1949) Sprachbeziehungen und sprachverwandtschaft in Afrika Berlin: ?.
• Westermann, Diedrich H. (1952) The languages of West Africa Oxford: Oxford University Press.
• Westermann, Diedrich H. (1964) Practical phonetics for students of African languages (4th improvement), Oxford: Oxford University Press.