| Ramdeo Rai | |
| Birth Date: | 1943 1, df=yes[1] |
| Birth Place: | Vill. Sherpur Sahilori, Post. Jayantigram, PS. Bhagwanpur, Dist-Begusarai, Bihar |
| Residence: | Patna, Bihar |
| Death Place: | Patna, Bihar, India |
| Death Cause: | Cancer |
| Office: | Member of Bihar Legislative Assembly |
| Constituency: | Bachhwara |
| Term Start: | 2015 |
| Term End: | 2020 |
| Predecessor: | Awadhesh Rai |
| Successor: | Surendra Mehata |
| Office2: | Member of Bihar Legislative Assembly |
| Constituency2: | Bachhwara |
| Term2: | 1972-1977; 1977-1980; 1980–1984 |
| Term End2: | 1984 |
| Predecessor2: | V. P. Singh |
| Successor2: | Ayodhya Prasad Singh |
| Office1: | Member of Bihar Legislative Assembly |
| Constituency1: | Bachhwara |
| Term1: | 2005–2010 (2-Terms) |
| Term End1: | 2010 |
| Predecessor1: | Uttam Kumar Yadav |
| Successor1: | Awadhesh Rai |
| Party: | Indian National Congress |
| Spouse: | Raj Kumari Devi RamKumari Devi |
| Children: | 7 (2 son and 5 daughter) |
| Alma Mater: | Master of Arts |
| Profession: | Politician social worker |
| 1Namedata2: | Ajit Kumar Mehta |
| Term End3: | 1989 |
| Term Start3: | 1984 |
| Predecessor3: | Ajit Kumar Mehta |
| Successor3: | Manjay Lal |
| Office3: | Member of Parliament, Lok Sabha |
| Constituency3: | Samastipur |
Ramdeo Rai (5 January 1943 – 29 August 2020) was an Indian politician. He was elected to the Bihar Legislative Assembly from Bachhwara[2] in 2015. Rai was the most senior politician in the Bihar Congress Party and he served six times as a Member of Bihar Legislative Assembly. In 14 November 1965 he started his career in politics on Jawaharlal Nehru's birthday. In 1984 he won the Samastipur Lok Sabha constituency against Karpoori Thakur.[3]