| Region: | Western philosophy |
| Era: | 21st-century philosophy |
| Brian E. O'Neil | |
| Birth Date: | 1921 |
| Death Date: | 1985 |
| Institutions: | University of New Mexico |
| Thesis Title: | Epistemological Direct Realism in Descartes' Philosophy |
| Thesis Year: | 1968 |
| Doctoral Advisor: | Wallace Matson |
| Education: | University of California at Berkeley (PhD) |
| Influences: | Descartes |
Brian E. O'Neil (1921-1985) was an American philosopher and a professor of philosophy at the University of New Mexico. He was known for his research on Descartes' philosophy.[1] [2] O'Neil died from cancer in 1985.[3]