Ida Caroline Ward (4 October 1880, Bradford – 10 October 1949, Guildford) was a British linguist working mainly on African languages who did influential work in the domains of phonology and tonology. Her 1933 collaboration with Diedrich Hermann Westermann, Practical Phonetics for Students of African languages, was reprinted many times. African languages she worked on include Efik (1933), Igbo (1936, 1941), Mende (1944), and Yoruba (published posthumously in 1952).
- Ward, Ida C. (1933) The phonetic and tonal structure of Efik. Cambridge: Heffer.
- Ward, Ida C. (1936) An introduction to the Ibo language. Cambridge: Heffer.
- Ward, Ida C. (1937) Practical suggestions for the learning of an African language in the field, Africa, supplement, vol. 10, no. 2. London.
- Ward, Ida C. (1941) Ibo dialects and the development of a common language. Cambridge: Heffer.
- Ward, Ida C. (1944) 'A phonetic introduction to Mende', in Crosby, K.H., An introduction to the study of Mende. Cambridge: Heffer.
- Ward, Ida C. (1952) An introduction to the Yoruba language. Cambridge: Heffer & Sons.
- Westermann, Diedrich Hermann & Ward, Ida C. (1933) Practical phonetics for students of African languages. London: Oxford University Press for the International African Institute
- Lilias E. Armstrong & Ward, Ida C. (1926) Handbook of English Intonation, B. G. Teubner, Leipzig, Germany
- Westermann, Diedrich Hermann & Forde, Daryll (1950) 'Ida Caroline Ward', Africa, 20, 1–5.