Back 1991 en science French 1991 במדע HE 1991 a tudományban Hungarian Науката во 1991 година MK Vitskap i 1991 NN Vitenskapsåret 1991 NB 1991 w nauce Polish 1991 na ciência Portuguese 1991 год в науке Russian Vetenskapsåret 1991 Swedish
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| 1991 in science |
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| Fields |
| Technology |
| Social sciences |
| Paleontology |
| Extraterrestrial environment |
| Terrestrial environment |
| Other/related |
The year 1991 in science and technology involved many significant events, some listed below.