Singida Region is one of Tanzania's 31 administrative regions. The region covers a land area of 49,340 km2 (19,050 sq mi). The region is comparable in size to the combined land area of the nation state of Slovakia. The Region is bordered to the north by Shinyanga Region, Simiyu Region and Arusha Region, to the northeast by Manyara Region, to the east by Dodoma Region, to the southeast by Iringa Region, to the southwest by Mbeya Region and to the west by Tabora Region. The regional capital is the municipality of Singida. According to the 2022 national census, the region had a population of 2,008,058.

Shinyanga Region is one of Tanzania's 31 administrative regions. The region covers a land area of 18,555 km2 (7,164 sq mi). The region is comparable in size to the combined land area of the nation state of Fiji. The region is bordered to the north by the Mwanza, Mara, and Kagera Regions and to the south by the Tabora Region. In addition, the Kigoma Region borders the region to the west, and the Simiyu Region and a sliver of Singida Region to the east. The regional capital is the municipality of Shinyanga. According to the 2022 national census, the region had a population of 2,241,299.