| Udai Bhan Tewari | |
| Birth Date: | 1944 6, df=yes |
| Birth Place: | Ambedkar Nagar, Uttar Pradesh, India |
| Death Place: | Kanpur |
| Citizenship: | Indian |
| Nationality: | Indian |
| Fields: | Harmonic Analysis |
| Workplaces: | IITK |
| Alma Mater: | Lucknow University University of California, Berkeley |
| Doctoral Advisor: | Henry Berge Helson |
| Awards: | Shanti Swaroop Bhatnagar Award(1986) |
Udai Bhan Tewari (born 18 June 1944) was an Indian mathematician, Emeritus Professor at IITK. His research work included contribution in the field of group algebra and measure algebra of locally compact group. He was awarded the Shanti Swaroop Bhatnagar Award for his contribution to mathematics.[1]