M. O. P. Iyengar
| Mandayam Osuri Parthasarathy Iyengar | |
|---|---|
| M.O.P. Iyengar in 1925, first row, third from left | |
| Born | 15 December 1886 | 
| Died | 10 December 1963 (aged 76) | 
| Alma mater | Presidency College, Chennai Queen Mary College, London | 
| Known for | Pioneering algae research in India Studies on Volvocales First President of the Phycological Society of India | 
| Scientific career | |
| Fields | Phycology, Botany | 
| Institutions | Presidency College, Chennai Madras University | 
| Doctoral advisor | Felix Eugen Fritsch | 
| Author abbrev. (botany) | Iyengar | 
Mandayam Osuri Parthasarathy Iyengar (15 December 1886 – 10 December 1963) was a prominent Indian botanist and phycologist who researched the structure, cytology, reproduction and taxonomy of algae. He is known as the "father of Indian phycology" or "father of algology in India". He was the first President of Phycological Society of India. He primarily studied the Volvocales. He was the brother of M. O. T. Iyengar.