111 Tauri System is a planetary system around the star 111 Tauri. It is, or at least has been, the site of a UNSC colony world, Victoria. In 2531, there were major rebel activities in the system, notable at Camp New Hope. It is unclear if it is currently under UNSC control still or if it has since been overthrown by rebel actions or destroyed by Covenant activity.
Due to intense engagements with the Covenant, certain sectors in this system were depleted of UNSC explosive materials, which prompted rebel fronts to begin trading actions with the UNSC in exchange of experienced medics to treat soldiers affected by Borens Syndrome.