Tojo Una-Una Regency is a regency of Central Sulawesi, Indonesia. The administrative centre is at Ampana town, on the Sulawesi 'mainland'. While the Regency includes a considerable area on the eastern peninsula of Sulawesi, it also includes the Togian Islands in the Gulf of Tomini. The total area covers 5,721.51 km and the population was 134,945 at the 2010 Census and 163,829 at the 2020 Census; the official estimate as at mid 2023 was 169,002 (comprising 86,970 males and 82,040 females).

On 18 December 2003, Tojo Una-Una Regency was created out of the former north-eastern districts of Poso Regency.

At the time of the 2010 Census, the Tojo Una-Una Regency was divided into nine districts (kecamatan). Subsequent to 2010, three additional districts have been created - Batudaka, Ratolindo and Talatako. These 12 districts (6 on the 'mainland' of Sulawesi and 6 forming the archipelago of the Togian Islands) are tabulated below with their areas and their populations at the 2010 and 2020 Censuses, together with the official estimates as at mid 2023. The table also includes the locations of the district administrative centres, the number of villages in each district (totaling 134 rural desa and 12 urban kelurahan), and its post code.

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of villages	Post code
72.09.07	Tojo Barat (West Tojo)	1,092.27	11,358	12,992	13,250	Tombiano	13	94680
72.09.08	Tojo	1,065.48	12,488	13,928	14,110	Uekuli	16	94681
72.09.06	Ulu Bongka	1,767.11	14,669	18,272	18,740	Marowo	18	94682
72.09.04	Ampana Tete	796.02	21,610	27,614	28,790	Tete A	20	94684
72.09.05	Ampana Kota (Ampana Town)	175.42	39,289	20,854	22,100	Ampana	10	94683
72.09.10	Ratolindo	61.88		28,735	29,570	Sumoli	10	94683 - 94695
Total of	Sulawesi mainland	4,958.18	99,414	122,395	126,560		87
72.09.01	Una-Una	146.16	12,455	8,236	8,350	Wakai	11	94690
72.09.11	Batudaka	151.91		5,796	5,900	Molowagu	9	94690 & 94691
72.09.02	Togean	229.51	9,160	10,734	11,040	Lebitii	16	94686
72.09.03	Walea Kepulauan (Walea Islands)	67.60	10,065	5,568	5,610	Popoliii	9	94694
72.09.09	Walea Besar (Great Walea)	84.51	3,851	4,629	4,790	Pasokani	8	94693
72.09.12	Talatako	83.64		6,471	6,760	Kaliai	6	94692
Total of	Togean Islands	763.33	35,531	41,434	42,450		59

Notes: (a) Ampana Town and Ratolindo Districts each comprises 6 kelurahan and 4 desa.
(b) The 2010 Census population of Ratolindo district is included in the figure for Ampana Kota district, from which it was cut out.
(c)The 2010 Census population of Batudaka district is included in the figure for Una-Una district, from which it was cut out.
(d) The 2010 Census population of Talatako district is included in the figure for Walea Kepulauan district, from which it was cut out.

The best place to do diving is Una Una volcano island.

Based on Badan Koordinasi Survei dan Pemetaan Nasional (Bakosurtanal) or Coordinating Agency for Surveys and Mapping, there are 33 dive sites disperses from north to south beaches of the Togian Islands with fringing reefs, barrier reefs, patch reefs and atolls. The area has the third most biodiversity in the world and is a series of Bunaken National Marine Park and Raja Ampat Islands.

• Official website of Tojo Una-Una Regency

0°52′32″S 121°37′47″E / 0.87556°S 121.62972°E / -0.87556; 121.62972