Rajammal Packiyanathan Devadas (7 April 1919 – 17 March 2002) was an Indian nutritionist, educationist and a former chancellor of Avinashilingam Institute for Home Science and Higher Education for Women, popularly known as Avinashilingam Deemed University. She was a member of the State Planning Commission of Tamil Nadu, Tamil Nadu Commission for Women and the elected vice president of the World Food Conference.^{[citation needed]} The Government of India awarded her the fourth highest civilian honour of the Padma Shri in 1992.

Rajammal Packiyanathan, born on 7 April 1919 to Muthiah Packiyanathan and Sornammal, in Chengam, North Arcot District (present Tiruvannamalai district) in the south Indian state of Tamil Nadu, graduated in science from Queen Mary's College, Chennai in 1944 after which secured a master's degree in science (1948), a master's degree in arts (1949) and a doctoral degree in philosophy (1950) from Ohio State University.^{[citation needed]}

Rajammal published several books and articles on the topics of nutrition and education and was the author of a book on T. S. Avinashilingam Chettiar. She was an honorary Colonel of the Tamil Nadu and Pondicherry chapters of the National Cadet Corps and a member of the Gandhigram Institute Rural Health and Family Planning, National Literacy Mission, Sigma Xi, Sigma Delta Epsilon, Omicron Nu, and Phi Upsilon Omicron.^{[citation needed]} She served as the president of the Nutrition Society of India from 1987 to 1991.