diff --git a/README.md b/README.md
index b9eca0be1..501bd7e86 100644
--- a/README.md
+++ b/README.md
@@ -311,6 +311,7 @@ Developer note: The software implements the [Torznab](https://github.com/Sonarr/
  * Sharingue
  * Shazbat
  * Shellife (SL)
+ * SiamBIT
  * SpaceTorrent
  * Speed-Share
  * SpeedCD
diff --git a/src/Jackett.Common/Definitions/siambit.yml b/src/Jackett.Common/Definitions/siambit.yml
new file mode 100644
index 000000000..1bcd3cfe6
--- /dev/null
+++ b/src/Jackett.Common/Definitions/siambit.yml
@@ -0,0 +1,162 @@
+---
+  site: siambit
+  name: SiamBIT
+  description: "SiamBIT is a THAI Private Torrent Tracker for GENERAL"
+  language: th-th
+  type: private
+  encoding: tis-620
+  links:
+    - https://www.siambit.me/
+
+  caps:
+    categorymappings:
+      - {id: 1, cat: Other, desc: "@ King"}
+      - {id: 75, cat: PC/0day, desc: "OS Windows / Office"}
+      - {id: 10, cat: TV, desc: "Cartoons / Animation"}
+      - {id: 9, cat: TV/Sport, desc: "Sports / Football"}
+      - {id: 110, cat: PC/Games, desc: "Mobile games"}
+      - {id: 7, cat: PC/Games, desc: "Games"}
+      - {id: 40, cat: Audio/Video, desc: "clips"}
+      - {id: 16, cat: Audio/Video, desc: "Concert"}
+      - {id: 3, cat: Audio/Other, desc: "Karaoke / MV"}
+      - {id: 70, cat: PC, desc: "software AntiVirus / Antispyware"}
+      - {id: 100, cat: PC/Phone-Other, desc: "software Mobile / Theme / Ringtone / mv"}
+      - {id: 85, cat: PC/Mac, desc: "Mac software"}
+      - {id: 105, cat: PC, desc: "Linux software"}
+      - {id: 8, cat: PC, desc: "software"}
+      - {id: 56, cat: Other, desc: "Dictionary / map"}
+      - {id: 19, cat: TV, desc: "Talk show / comedy / radio"}
+      - {id: 20, cat: TV, desc: "general"}
+      - {id: 55, cat: PC/Phone-IOS, desc: "Tablet / iPhone"}
+      - {id: 21, cat: TV, desc: "Dharma"}
+      - {id: 2, cat: Audio/MP3, desc: "Music"}
+      - {id: 130, cat: Audio/Audiobook, desc: "High quality music (Lossless)"}
+      - {id: 60, cat: Other, desc: "fonts / icons / clip art / templates"}
+      - {id: 90, cat: Movies/UHD, desc: "4K UHD movies"}
+      - {id: 91, cat: Movies/DVD, desc: "DVD movies"}
+      - {id: 92, cat: Movies/HD, desc: "Hi-Def movies"}
+      - {id: 89, cat: Movies/SD, desc: "VCD movies"}
+      - {id: 93, cat: TV, desc: "Mother and child @ / Learning materials for children"}
+      - {id: 4, cat: TV, desc: "TV shows / Variety / Game shows"}
+      - {id: 50, cat: Other, desc: "Images"}
+      - {id: 18, cat: Other, desc: "website"}
+      - {id: 17, cat: TV/Documentary, desc: "Documentary"}
+      - {id: 11, cat: Books/Technical, desc: "Learning materials / Books / Ebook"}
+      - {id: 5, cat: Movies, desc: "Movies / series [Korea]"}
+      - {id: 54, cat: Movies, desc: "Movies / Series [China]"}
+      - {id: 51, cat: Movies, desc: "Movie series / series [Japan]"}
+      - {id: 52, cat: Movies, desc: "Movies / Series [Western]"}
+      - {id: 57, cat: Movies, desc: "Movies / series [other]"}
+      - {id: 53, cat: Movies, desc: "Movie series / series / drama [Thai]"}
+      - {id: 901, cat: XXX, desc: "XXX-Anime"}
+      - {id: 902, cat: XXX, desc: "XXX-Game"}
+      - {id: 903, cat: XXX, desc: "XXX-Japan censored"}
+      - {id: 904, cat: XXX, desc: "XXX-Japan"}
+      - {id: 905, cat: XXX, desc: "XXX-Guava"}
+      - {id: 906, cat: XXX, desc: "XXX-Asia censored"}
+      - {id: 907, cat: XXX, desc: "XXX-Asia"}
+      - {id: 908, cat: XXX, desc: "XXX-Gay"}
+      - {id: 910, cat: XXX, desc: "XXX-clip"}
+      - {id: 911, cat: XXX, desc: "XXX-pictures"}
+      - {id: 912, cat: XXX, desc: "XXX-magazine"}      
+
+    modes:
+      search: [q]
+      tv-search: [q, season, ep]
+      movie-search: [q]
+
+  login:
+    path: takelogin.php
+    method: post
+    inputs:
+      username: "{{ .Config.username }}"
+      password: "{{ .Config.password }}"
+    error:
+      - selector: td.text
+    test:
+      path: nDonated.php
+      selector: a[href="logout.php"]
+
+  search:
+    paths:
+      - path: viewno18.php
+        categorymappings: ["!", 901, 902, 903, 904, 905, 906, 907, 908, 910, 911, 912]
+      - path: viewbr.php
+        categorymappings: [901, 902, 903, 904, 905, 906, 907, 908, 910, 911, 912]
+    inputs:
+      $raw: "{{range .Categories}}c{{.}}=1&{{end}}"
+      search: "{{ .Keywords }}"
+      searchin: 0
+    rows:
+      selector: table[width="100%"][border="1"][cellspacing="0"][cellpadding="5"] > tbody > tr:has(a[href^="downloadnew.php?id="])
+    fields:
+      title:
+        selector: a[href^="details.php?id="]
+      details:
+        selector: a[href^="details.php?id="]
+        attribute: href
+      category:
+        selector: a[href^="viewno18.php?cat="], a[href^="viewbr.php?cat="]
+        attribute: href
+        filters:
+          - name: querystring
+            args: cat
+      download:
+        selector: a[href^="downloadnew.php?id="]
+        attribute: href
+      imdb:
+        optional: true
+        selector: a[href*="www.imdb.com/title/"]
+        attribute: href
+      files:
+        selector: td:nth-child(5)
+      date:
+        selector: td:nth-child(7)
+        filters:
+          - name: dateparse
+            args: "02-01-200615:04:05"
+      size:
+        selector: td:nth-child(8)
+      grabs:
+        selector: td:nth-child(9)
+        filters:
+          - name: regexp
+            args: (\d+)
+      seeders:
+        selector: td:nth-child(10)
+      leechers:
+        selector: td:nth-child(11)
+      downloadvolumefactor:
+        case:
+          "td:nth-child(3):contains(\"100%\")": "0"
+          "td:nth-child(3):contains(\"95%\")": "0.05"
+          "td:nth-child(3):contains(\"90%\")": "0.1"
+          "td:nth-child(3):contains(\"85%\")": "0.15"
+          "td:nth-child(3):contains(\"80%\")": "0.2"
+          "td:nth-child(3):contains(\"75%\")": "0.25"
+          "td:nth-child(3):contains(\"70%\")": "0.3"
+          "td:nth-child(3):contains(\"65%\")": "0.35"
+          "td:nth-child(3):contains(\"60%\")": "0.4"
+          "td:nth-child(3):contains(\"55%\")": "0.45"
+          "td:nth-child(3):contains(\"50%\")": "0.5"
+          "td:nth-child(3):contains(\"45%\")": "0.55"
+          "td:nth-child(3):contains(\"40%\")": "0.6"
+          "td:nth-child(3):contains(\"35%\")": "0.65"
+          "td:nth-child(3):contains(\"30%\")": "0.7"
+          "td:nth-child(3):contains(\"25%\")": "0.75"
+          "td:nth-child(3):contains(\"20%\")": "0.8"
+          "td:nth-child(3):contains(\"15%\")": "0.85"
+          "td:nth-child(3):contains(\"10%\")": "0.9"
+          "td:nth-child(3):contains(\"5%\")": "0.95"
+          "*": "1"
+      uploadvolumefactor:
+        case:
+          "td:nth-child(4):contains(\"x2\")": "2"
+          "td:nth-child(4):contains(\"x3\")": "3"
+          "td:nth-child(4):contains(\"x4\")": "4"
+          "td:nth-child(4):contains(\"x5\")": "5"
+          "td:nth-child(4):contains(\"x6\")": "6"
+          "td:nth-child(4):contains(\"x7\")": "7"
+          "td:nth-child(4):contains(\"x8\")": "8"
+          "td:nth-child(4):contains(\"x9\")": "9"
+          "*": "1"