O. P. Ramaswamy Reddiyar
| Omandur Periyavalavu Ramaswamy Reddiyar | |
|---|---|
| Reddiyar on a 2010 stamp of India | |
| 4th Premier of Madras Presidency | |
| In office 23 March 1947 – 6 April 1949 | |
| Preceded by | Tanguturi Prakasam | 
| Succeeded by | P. S. Kumaraswamy Raja | 
| Personal details | |
| Born | 1 February 1895 Omandur, Madras Presidency, British India | 
| Died | 25 August 1970 (aged 75) Vadalur, Tamil Nadu, India | 
| Political party | Indian National Congress | 
| Spouse | Singaratha Ammal | 
| Occupation | Farmer, Politician | 
| Profession | Farmer | 
Omandur Periyavalavu Ramasamy Reddiyar (1 February 1895–25 August 1970) was an Indian freedom-fighter and politician of the Indian National Congress. He served as the Premier of Madras Presidency from 23 March 1947 to 6 April 1949.