West Tulang Bawang Regency (Indonesian: Kabupaten Tulung Bawang Barat) is a regency (kabupaten) of Lampung Province, Sumatra, Indonesia. It was created on 29 October 2008 from what were formerly the western districts of Tulang Bawang Regency. It has an area of 1,201.15 km and had a population of 250,707 people at the 2010 Census and 286,162 at the 2020 Census; the official estimate as at mid 2023 was 295,481 (comprising 150,600 males and 144,881 females). The regency seat is the town of Panaragan Jaya.

At the time of the 2010 Census the Regency comprised eight districts (kecamatan), but subsequently a ninth district - Batu Putih - was created from the southwest part of Gunung Terang District. The first three districts listed below lie south of the Tulang Bawang River (although Tulang Bawang Udik District straddles the river in the west), while the other six districts lie north of the river. The districts are listed below with their areas and their populations at the 2010 Census and the 2020 Census, together with the official estimates as at mid 2023. The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totalling 93 rural desa and 3 urban kelurahan), and its post code.

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n 2010 Census	Pop'n 2020 Census	Pop'n mid 2023 Estimate	Admin centre	No. of villages	Post code
18.12.03	Tulang Bawang Udik	237.50	29,969	33,231	33,980	Karta	9	34791
18.12.02	Tumijajar	133.22	40,547	44,658	45,560	Dayamurni	10	34794
18.12.01	Tulang Bawang Tengah (Central Tulang Bawang)	274.93	76,559	86,351	88,790	Panaragan Jaya	19	34793
18.12.08	Pagar Dewa	99.65	5,131	6,781	7,000	Pagar Dewa	6	34792
18.12.07	Lambu Kibang	109.82	21,831	23,278	24,210	Kibang Budi Jaya	10	34787
18.12.04	Gunung Terang	72.90	30,228	19,472	19,990	Gunung Terang	10	34784
18.12.09	Batu Putih	69.01		16,655	17,520	Margo Mulyo	10	34785
18.12.05	Gunung Agung	127.64	28,057	33,079	34,510	Tunas Jaya	13	34783
18.12.06	Way Kenanga	76.48	18,385	22,657	23,910	Balam Jaya	9	34788
	Totals	1,201.15	250,707	286,162	295,481	Panaragan Jaya	96

Notes: (a) including kelurahan of Sumber Rejo. (b) including the two kelurahan of Panaragan Jaya and Mulyo Asri.
(c) the 2010 population of Batu Putih District was included in the figure for Gunung Terang District, from which it was subsequently cut out.

4°26′23″S 105°02′40″E / 4.4398°S 105.0444°E / -4.4398; 105.0444