Tanah Bumbu is one of the regencies in the Indonesian province of South Kalimantan.

It was formerly part of Kotabaru Regency, but was split off on 25 February 2003 to form a separate regency, following dissatisfaction on the Kalimantan mainland territories with administration from Laut Island.

The twelve districts are listed below with their areas and their 2010[2] and 2020 Census[3] populations, together with the official estimates as at mid 2023.

[1] The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totalling 144 rural desa and 5 urban kelurahan), and its post code.

(g) includes the three offshore islands of Burung, Hantu and Tampakan.