| Official Name: | East Seram Regency |
| Native Name: | Kabupaten Seram Bagian Timur |
| Native Name Lang: | id |
| Type: | Regency |
| Motto: | Ila Wotu Nusa (We Build Regions) |
| Coordinates: | -3.3985°N 130.3917°W |
| Area Code Type: | Area code |
| Area Code: | (+62) 911 |
| Pushpin Map: | Indonesia_Seram#Indonesia_Maluku#Indonesia |
| Pushpin Map Caption: | Location in Seram, Maluku and Indonesia |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: |  Indonesia |
| Subdivision Type1: | Province |
| Seat Type: | Capital |
| Seat: | Bula |
| Leader Title: | Regent |
| Leader Name: | Mukti Keliobas |
| Leader Title1: | Vice Regent |
| Leader Name1: | Fachri H. Alkatiri |
| Area Total Km2: | 5779.12 |
| Population As Of: | mid 2023 estimate |
| Population Total: | 138580 |
| Population Density Km2: | auto |
| Population Footnotes: | [1] |
| Timezone1: | IEST |
| Utc Offset1: | +9 |
East Seram Regency (Indonesian: Kabupaten Seram Bagian Timur) is a regency of Maluku (province), in Indonesia. It is mainly located on the island of Seram, but also includes smaller islands to the southeast comprising the Gorom and Watubela archipelagoes. The regency covers a land area of 5,779.12 km2, and had a population of 99,065 at the 2010 Census[2] and 137,972 at the 2020 Census;[3] the official estimate as at mid 2023 was 138,580 (comprising 70,051 males and 68,529 females).[4] The principal town lies at Bula, on Seram Island.
At the time of the 2010 Census the regency was divided into six districts (kecamatan), an increase from the original four. The first four of these six districts were on the island of Seram; the Gorom and Watubela archipelagoes are groups of smaller islands situated to the southeast of Seram. Subsequently, six additional districts were created in 2012 by the division of the original six districts, and a further three districts were created in 2014, so that the regency is now divided into fifteen districts (kecamatan), of which ten are on the island of Seram and five on the islands to its southeast. These are tabulated below with their present areas and their populations at the 2010[5] and 2020[6] Censuses, together with the official estimates as at mid 2023.[7] The table also includes the locations of the district administrative centres, the number of administrative villages (all classed as rural desa) in each district, and its post code.
| Kode Wilayah | Name of District (kecamatan) | Area in km2 | Pop'n Census 2010 | Pop'n Census 2020 | Pop'n Estimate mid 2023 | Admin centre | No. of Villages | Post Code | |
|---|---|---|---|---|---|---|---|---|---|
| 81.05.01 | Bula | 643.36 | 24,037 | 26,023 | 26,695 | Bula | 10 | 97521 | |
| 81.05.12 | Bula Barat (West Bula) | 880.29 | (a) | 8,281 | 8,540 | Waiketam Baru | 13 | 97522 | |
| 81.05.15 | Teluk Waru (Waru Bay) | 669.67 | (a) | 5,279 | 5,790 | Waru | 11 | 97524 | |
| 81.05.03 | Werinama | 993.84 | 9,752 | 6,165 | 5,741 | Werinama | 10 | 97525 | |
| 81.05.07 | Siwalalat | 847.19 | (b) | 6,585 | 6,404 | Atiahu | 12 | 97523 | |
| 81.05.06 | Tutuk Tolu | 330.09 | 4,722 | 7,166 | 7,033 | Air Kasar | 11 | 97594 | |
| 81.05.02 | Seram Timur (c) (East Seram) | 73.35 | 24,018 | 12,181 | 12,255 | Geser | 16 | 97592 | |
| 81.05.08 | Kilmury | 837.62 | (c) | 6,518 | 6,440 | Kilmury | 14 | 97591 | |
| 81.05.13 | Kian Darat | 129.23 | (c) | 6,297 | 6,450 | Watu-Watu | 10 | 97590 | |
| 81.05.14 | Siritaun Wida Timur (Lian Vitu) | 172.37 | (c) | 6,689 | 7,137 | Keta Rumadan | 10 | 97598 | |
| Sub-totals | on Seram Island | 5,577.01 | 62,529 | 91,184 | 92,485 | 117 | |||
| 81.05.04 | Pulau Gorom (Gorom Island) | 91.30 | 25,249 | 22,156 | 21,787 | Kataloka | 24 | 97593 | |
| 81.05.11 | Gorom Timur (East Gorom) | 29.29 | (d) | 9,420 | 9,426 | Miran | 23 | 97596 | |
| 81.05.09 | Pulau Panjang (Panjang Island) | 20.59 | 1,913 | 2,691 | 2,648 | Pulau Panjang | 6 | 97599 | |
| 81.05.05 | Kesui Watubela (e) | 37.58 | 9,251 | 9,321 | 9,039 | Tamher Timur | 18 | 97595 | |
| 81.05.10 | Teor (Teor Island) | 23.41 | 2,556 | 3,200 | 3,195 | Wermaf Kampung Tengah | 10 | 97597 | |
| Sub-totals | Gorom and Watubela archipelagoes | 202.17 | 38,969 | 46,788 | 46,095 | 81 |
Notes:(a) The 2010 Census populations of Bula Barat and Teluk Waru Districts are included with the figures for Bula District, from which they were cut out.
(b) The 2010 Census population of Siwalalat District is included with the figure for Werinama District, from which it was cut out.
(c) The 2010 Census populations of Kilmury, Kian Dalat and Lian Vitu (or Siritaun Wida Timur) Districts are included with the figures for Seram Timur District, from which they were cut out.
(d) The 2010 Census population of Gorom Timur District is included with the figure for Pulau Gorom district, from which it and Pulau Panjang District were cut out.
(e) The 2010 Census population of Kesui Watubela (or Wakate) District excludes the figure for Teor District, which was cut out of it.