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| Sigríður Ólafsdóttir | Associate Professor | sol [at] hi.is | Productive language proficiency, language stimulation in school activities | |
| Sigríður Sigurjónsdóttir | Professor | 8672406 | siggasig [at] hi.is | The new transitive impersonal construction in icelandic, the linguistic consequences of digital language contact |
| Sigríður Zoéga | Associate Professor | 5254919 | szoega [at] hi.is | Long term effects of covid-19, advanced practice nursing |
| Sigrún Gunnarsdóttir | Professor | sigrungu [at] hi.is | Job satisfaction | |
| Sigrún Margrét Guðmundsdóttir | Adjunct Lecturer | sigrunmg [at] hi.is | Contemporary icelandic poetry and fiction, horror fiction, fantasy and science fiction, fiction and film about ecological disaster, popular fiction | |
| Sigrún Nanna Karlsdóttir | Professor | 5255310 | snk [at] hi.is | Microstructural and chemical compositional analyses, material characterization |
| Sigurbjörg Jóhannesdóttir | Project Manager | 5255434 | sigurbjorg [at] hi.is | Ict in education |
| Sigurður Grétar Bogason | Project Manager | 3545254 575 | sigboga [at] hi.is | Environmental impacts of food production, food processing and product development |
| Sigurður Guðmundsson | Professor Emeritus | 5431000 | siggudm [at] hi.is | Infectious diseases |
| Sigurður Reynir Gíslason | Research Professor | 5254497 | sigrg [at] hi.is | Water-rock-gas chemical interactions |