Kay Williamson (1935 – January 3, 2005, Brazil), born Ruth Margaret Williamson was a linguist who specialised in the study of African languages, particularly those of the Niger Delta in Nigeria, where she lived for nearly fifty years. She has been called "The Mother of Nigerian Linguistics." Her many publications include a grammar and dictionary of the Ijo language, a dictionary of Igbo and numerous articles on diverse topics. She is also notable for proposing the Pan-Nigerian Alphabet.