| Ugolini, Filippo |
| Ulanov, Barry |
| Ulanowicz, Robert E. |
| Ular, Alexander |
| Uluru Katatjuta Board of Management/ Australian National Parks and Wildlife Service |
| Underwood, Leon |
| Underwood, T. |
| Unglick, Ari |
| Union Internationale dÂ’Histoire et de Philosophie des Sciences. |
| Unterman, Alan |
| Upfield, Arthur W. |
| Urban Research and Action |
| Urmson, J.O |