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Puduru Viswanatha Arunachalam (14 September 1934 – 13 August 2020) was an Indian applied mathematician, educationalist and poet. He was born at Karvetnagar (near to Tirupathi), India. He obtained his Ph.D. under supervision of S.D. Nigam from Indian Institute of Technology, Madras in 1968. He was a professor of applied mathematics at Sri Venkateswara University, Tirupathi, India, and known for his work in fluid mechanics and dynamics.

He served as 4th president of Andhra Pradesh and Telangana Society for Mathematical Sciences (APTSMS), formerly known as Andhra Pradesh Society for Mathematical Sciences (APSMS), as founding Vice Chancellor (1997-2001) of Dravidian University, Kuppam, India. He also served as a president of Indian Mathematical Society for the period 2001-2002.

He was honored with P.C.Mahalanobis Birth Century Gold Medal by former Indian Prime Minister Manmohan Singh in 2008.

He was fascinated on ancient language, Sanskrit and his mother tongue, Telugu. He wrote around 150 poems in Telugu and Sanskrit.