Man Mohan Singh Ahuja (1929 – 12 July 1998) was Indian physician and endocrinologist. He was born in 1929 in Multan in British India. He was graduated from Madras Medical College in 1952. He passed M.R.C.P. (London) in 1956, and did residency at Hammersmith Hospital, London. In 1958, he joined All India Institute of Medical Sciences as Registrar in Medicine department under Prof. K. L. Wig. He was promoted as Associate Professor and later as Head of the Department of Medicine in 1969. He became Head of the Department of Endocrinology and Metabolism, when it was formed in 1982 until 1989. He was Dean of the Institute in 1988–1989.