Diwan Bahadur Sakkottai Krishnaswamy Aiyangar FRAS (15 April 1871 – 26 November 1946) was an Indian historian, academician and Dravidologist. He chaired the Department of Indian History and Archaeology at the University of Madras from 1914 to 1929. Aiyangar was elected a member of the Royal Asiatic Society in 1908 and was conferred a Diwan Bahadur title in 1928. He is known for the new methods he introduced in interpreting the history of Vijayanagar. His historical methodology is considered to be Indian nationalistic.