diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b9fa3542..6ca925c3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,7 +21,7 @@ jobs:
       uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
     - name: Install OS dependencies
-      run: sudo apt-get -y install mandoc zsh
+      run: sudo apt-get -y install mandoc zsh fish
 
     # Rush needed for easy installation of stuff
     - name: Install rush
diff --git a/README.md b/README.md
index 97a402b9..c16f5f1a 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Bashly is responsible for:
   - **Color output**.
   - **Config file management** (INI format).
   - **YAML parsing**.
-  - **Bash completions**.
+  - **Shell completions** (bash, fish and zsh).
   - *and more*.
 - Auto-generating **markdown and man page documentation** for your script.
 
diff --git a/examples/completions-advanced/README.md b/examples/completions-advanced/README.md
index 67f25a0f..a7611934 100644
--- a/examples/completions-advanced/README.md
+++ b/examples/completions-advanced/README.md
@@ -15,6 +15,11 @@ source <(cli completions)
 source <(cli completions zsh)
 ```
 
+```fish
+# Fish
+cli completions fish | source
+```
+
 <!-- include: settings.yml src/completions_command.sh src/lib/completions.sh -->
 
 -----
@@ -32,7 +37,7 @@ commands:
   args:
   - name: shell
     help: Shell to generate completions for
-    allowed: [bash, zsh]
+    allowed: [bash, fish, zsh]
     default: bash
 
 - name: deploy
diff --git a/examples/completions-advanced/src/bashly.yml b/examples/completions-advanced/src/bashly.yml
index ac2e980d..f65f9d64 100644
--- a/examples/completions-advanced/src/bashly.yml
+++ b/examples/completions-advanced/src/bashly.yml
@@ -8,7 +8,7 @@ commands:
   args:
   - name: shell
     help: Shell to generate completions for
-    allowed: [bash, zsh]
+    allowed: [bash, fish, zsh]
     default: bash
 
 - name: deploy
diff --git a/examples/completions/README.md b/examples/completions/README.md
index 468260c4..023ee54f 100644
--- a/examples/completions/README.md
+++ b/examples/completions/README.md
@@ -13,6 +13,11 @@ source <(cli completions)
 source <(cli completions zsh)
 ```
 
+```fish
+# Fish
+cli completions fish | source
+```
+
 This example was generated with:
 
 ```bash
@@ -41,7 +46,7 @@ commands:
   args:
   - name: shell
     help: Shell to generate completions for
-    allowed: [bash, zsh]
+    allowed: [bash, fish, zsh]
     default: bash
 
 - name: download
diff --git a/examples/completions/src/bashly.yml b/examples/completions/src/bashly.yml
index fce8126e..fc9eb387 100644
--- a/examples/completions/src/bashly.yml
+++ b/examples/completions/src/bashly.yml
@@ -8,7 +8,7 @@ commands:
   args:
   - name: shell
     help: Shell to generate completions for
-    allowed: [bash, zsh]
+    allowed: [bash, fish, zsh]
     default: bash
 
 - name: download
diff --git a/lib/bashly/concerns/settings_completions.rb b/lib/bashly/concerns/settings_completions.rb
index cca36d3a..b7eac73e 100644
--- a/lib/bashly/concerns/settings_completions.rb
+++ b/lib/bashly/concerns/settings_completions.rb
@@ -1,6 +1,6 @@
 module Bashly
   module SettingsCompletions
-    COMPLETION_SHELLS = %w[bash zsh].freeze
+    COMPLETION_SHELLS = %w[bash fish zsh].freeze
 
     def completions
       @completions ||= get :completions
diff --git a/lib/bashly/libraries/settings/settings.yml b/lib/bashly/libraries/settings/settings.yml
index 34086c2c..bd22e15a 100644
--- a/lib/bashly/libraries/settings/settings.yml
+++ b/lib/bashly/libraries/settings/settings.yml
@@ -167,8 +167,8 @@ enable_sourcing: development
 # Generate native runtime completions. Supported values:
 # - ~ or false     # disable completions (default)
 # - minimal        # generate the runtime completion engine without shell adapters
-# - bash or zsh    # generate the runtime engine and one shell adapter
-# - bash,zsh       # generate the runtime engine and selected shell adapters
+# - bash|fish|zsh  # generate the runtime engine and one shell adapter
+# - bash,fish      # generate the runtime engine and selected shell adapters
 # - full           # generate the runtime engine and all available shell adapters
 completions: ~
 
diff --git a/lib/bashly/views/command/completion_script_fish.gtx b/lib/bashly/views/command/completion_script_fish.gtx
new file mode 100644
index 00000000..f7fb4015
--- /dev/null
+++ b/lib/bashly/views/command/completion_script_fish.gtx
@@ -0,0 +1,69 @@
+= view_marker
+
+> send_completions_fish() {
+>   echo $'function _{{ name.to_underscore }}_completions'
+>   echo $'  set --local completion_tokens (commandline --current-process --tokenize --cut-at-cursor)'
+>   echo $'  set --local completion_current (commandline --current-token --cut-at-cursor)'
+>   echo $'  set --local completion_command $completion_tokens[1]'
+>   echo $'  set --local completion_words'
+>   echo $''
+>   echo $'  if test (count $completion_tokens) -gt 1'
+>   echo $'    set completion_words $completion_tokens[2..-1]'
+>   echo $'  end'
+>   echo $''
+>   echo $'  set --local completion_response ($completion_command __complete $completion_words "$completion_current")'
+>   echo $'  set --query completion_response[1]; or return'
+>   echo $''
+>   echo $'  set --local completion_directive $completion_response[-1]'
+>   echo $'  set --local completion_options'
+>   echo $''
+>   echo $'  if string match --quiet --regex "^:options=" -- $completion_directive'
+>   echo $'    set --erase completion_response[-1]'
+>   echo $'    set completion_options (string split --no-empty , -- (string replace --regex "^:options=" "" -- $completion_directive))'
+>   echo $'  end'
+>   echo $''
+>   echo $'  set --local completion_files false'
+>   echo $'  set --local completion_directories false'
+>   echo $'  set --local completion_no_space false'
+>   echo $''
+>   echo $'  for completion_option in $completion_options'
+>   echo $'    switch $completion_option'
+>   echo $'      case files'
+>   echo $'        set completion_files true'
+>   echo $'      case directories'
+>   echo $'        set completion_directories true'
+>   echo $'      case no-space'
+>   echo $'        set completion_no_space true'
+>   echo $'    end'
+>   echo $'  end'
+>   echo $''
+>   echo $'  set --local completion_candidates $completion_response'
+>   echo $'  set --local completion_paths'
+>   echo $''
+>   echo $'  if test $completion_files = true'
+>   echo $'    set completion_paths (__fish_complete_path "$completion_current")'
+>   echo $'  else if test $completion_directories = true'
+>   echo $'    set completion_paths (__fish_complete_directories "$completion_current")'
+>   echo $'  end'
+>   echo $''
+>   echo $'  # path candidates carry a tab-separated description, and older fish'
+>   echo $'  # versions do not deduplicate candidates on their own'
+>   echo $'  for completion_path in $completion_paths'
+>   printf '%s\n' $'    if not contains -- (string replace --regex \'\\t.*\' \'\' -- $completion_path) $completion_response'
+>   echo $'      set --append completion_candidates $completion_path'
+>   echo $'    end'
+>   echo $'  end'
+>   echo $''
+>   echo $'  # fish has no no-space directive, but it appends a space only to a'
+>   echo $'  # unique candidate, so a second candidate suppresses it'
+>   echo $'  if test $completion_no_space = true; and test (count $completion_candidates) -eq 1'
+>   echo $'    set --append completion_candidates "$completion_candidates[1] "'
+>   echo $'  end'
+>   echo $''
+>   echo $'  if set --query completion_candidates[1]'
+>   printf '%s\n' $'    printf \'%s\\n\' $completion_candidates'
+>   echo $'  end'
+>   echo $'end'
+>   echo $''
+>   echo $'complete --command {{ name }} --no-files --arguments "(_{{ name.to_underscore }}_completions)"'
+> }
diff --git a/schemas/settings.json b/schemas/settings.json
index db20967c..792a7035 100644
--- a/schemas/settings.json
+++ b/schemas/settings.json
@@ -202,7 +202,7 @@
         },
         {
           "type": "string",
-          "pattern": "^(minimal|full|(bash|zsh)(\\s*,\\s*(bash|zsh))*)$"
+          "pattern": "^(minimal|full|(bash|fish|zsh)(\\s*,\\s*(bash|fish|zsh))*)$"
         }
       ],
       "default": null
diff --git a/spec/bashly/integration/completion_script_bash_spec.rb b/spec/bashly/integration/completion_script_bash_spec.rb
index 84306627..256423a1 100644
--- a/spec/bashly/integration/completion_script_bash_spec.rb
+++ b/spec/bashly/integration/completion_script_bash_spec.rb
@@ -57,12 +57,12 @@ def complete_with_bash(*words, trace_options: false)
 
     it 'rejects unsupported shells' do
       stdout, stderr, status = Open3.capture3(
-        'bash', '-c', "source #{cli}; send_completions fish"
+        'bash', '-c', "source #{cli}; send_completions ksh"
       )
 
       expect(status).not_to be_success
       expect(stdout).to be_empty
-      expect(stderr).to eq "unsupported shell: fish\n"
+      expect(stderr).to eq "unsupported shell: ksh\n"
     end
   end
 
diff --git a/spec/bashly/integration/completion_script_fish_spec.rb b/spec/bashly/integration/completion_script_fish_spec.rb
new file mode 100644
index 00000000..c73e3ff3
--- /dev/null
+++ b/spec/bashly/integration/completion_script_fish_spec.rb
@@ -0,0 +1,106 @@
+describe 'Fish completion script', :slow do
+  def complete_with_fish(*words)
+    commandline = ['./cli', *words].map { |word| word.empty? ? '' : Shellwords.shellescape(word) }.join ' '
+
+    stdout, stderr, status = Open3.capture3(
+      'fish', '--no-config', '--private', '-c', <<~FISH
+        cd ./spec/tmp
+        eval (bash -c 'source ./cli; send_completions fish' | string collect)
+        complete -C #{Shellwords.shellescape commandline}
+      FISH
+    )
+
+    # Fish candidates may carry a tab-separated description
+    candidates = stdout.lines(chomp: true).map { |line| line.split("\t").first }
+    [candidates, stderr, status]
+  end
+
+  context 'when generating the script' do
+    let(:cli) { File.expand_path 'spec/tmp/cli' }
+
+    before(:context) do
+      Settings.completions = 'full'
+      reset_tmp_dir
+      FileUtils.cp_r Dir['spec/fixtures/completions/core/*'], 'spec/tmp'
+      Commands::Generate.new.execute %w[generate --quiet]
+    end
+
+    after(:context) do
+      Settings.completions = nil
+    end
+
+    it 'prints Fish completions' do
+      stdout, stderr, status = Open3.capture3(
+        'bash', '-c', "source #{cli}; send_completions fish"
+      )
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(stdout).to start_with "function _cli_completions\n"
+      expect(stdout).to end_with %(complete --command cli --no-files --arguments "(_cli_completions)"\n)
+    end
+
+    it 'completes commands' do
+      candidates, stderr, status = complete_with_fish 'd'
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(candidates).to eq %w[deploy]
+    end
+
+    it 'preserves an empty current word' do
+      candidates, stderr, status = complete_with_fish 'server', ''
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(candidates).to include 'start'
+    end
+  end
+
+  context 'with configured options' do
+    before(:context) do
+      Settings.completions = 'full'
+      reset_tmp_dir
+      FileUtils.cp_r Dir['spec/fixtures/completions/configured/*'], 'spec/tmp'
+      Commands::Generate.new.execute %w[generate --quiet]
+      FileUtils.touch 'spec/tmp/apple.txt'
+      FileUtils.mkdir 'spec/tmp/apricot'
+    end
+
+    after(:context) do
+      Settings.completions = nil
+    end
+
+    it 'preserves literal candidates' do
+      candidates, stderr, status = complete_with_fish 'static', ''
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(candidates).to include 'two words', '$literal', ':options=files'
+    end
+
+    it 'adds files when requested' do
+      candidates, stderr, status = complete_with_fish 'files', 'a'
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(candidates).to contain_exactly 'apple.txt', 'apricot/'
+    end
+
+    it 'adds only directories when requested' do
+      candidates, stderr, status = complete_with_fish 'directories', 'a'
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(candidates).to eq %w[apricot/]
+    end
+
+    it 'adds a second candidate to apply no-space to a unique candidate' do
+      candidates, stderr, status = complete_with_fish 'flag', '--target', 'pro'
+
+      expect(status).to be_success
+      expect(stderr).to be_empty
+      expect(candidates).to eq ['production', 'production ']
+    end
+  end
+end
diff --git a/spec/bashly/integration/completion_settings_spec.rb b/spec/bashly/integration/completion_settings_spec.rb
index 3c0b781f..efa5d60e 100644
--- a/spec/bashly/integration/completion_settings_spec.rb
+++ b/spec/bashly/integration/completion_settings_spec.rb
@@ -29,14 +29,25 @@ def generate_with_completions(value)
     script = generate_with_completions 'bash'
 
     expect(script).to include 'send_completions_bash() {'
+    expect(script).not_to include 'send_completions_fish() {'
     expect(script).not_to include 'send_completions_zsh() {'
     expect(script).to include 'local completion_shell="${1:-bash}"'
   end
 
+  it 'generates only the Fish adapter when Fish is selected' do
+    script = generate_with_completions 'fish'
+
+    expect(script).not_to include 'send_completions_bash() {'
+    expect(script).to include 'send_completions_fish() {'
+    expect(script).not_to include 'send_completions_zsh() {'
+    expect(script).to include 'local completion_shell="${1:-fish}"'
+  end
+
   it 'generates only the Zsh adapter when Zsh is selected' do
     script = generate_with_completions 'zsh'
 
     expect(script).not_to include 'send_completions_bash() {'
+    expect(script).not_to include 'send_completions_fish() {'
     expect(script).to include 'send_completions_zsh() {'
     expect(script).to include 'local completion_shell="${1:-zsh}"'
   end
@@ -45,6 +56,7 @@ def generate_with_completions(value)
     script = generate_with_completions 'full'
 
     expect(script).to include 'send_completions_bash() {'
+    expect(script).to include 'send_completions_fish() {'
     expect(script).to include 'send_completions_zsh() {'
   end
 end
diff --git a/spec/bashly/settings_spec.rb b/spec/bashly/settings_spec.rb
index 025d92a7..dcda46c3 100644
--- a/spec/bashly/settings_spec.rb
+++ b/spec/bashly/settings_spec.rb
@@ -152,7 +152,7 @@
     it 'enables every supported shell when set to full' do
       subject.completions = 'full'
 
-      expect(subject.completion_shells).to eq %w[bash zsh]
+      expect(subject.completion_shells).to eq %w[bash fish zsh]
     end
 
     it 'accepts one shell' do
@@ -162,9 +162,9 @@
     end
 
     it 'accepts comma-separated shells with optional whitespace' do
-      subject.completions = 'bash, zsh'
+      subject.completions = 'bash, fish, zsh'
 
-      expect(subject.completion_shells).to eq %w[bash zsh]
+      expect(subject.completion_shells).to eq %w[bash fish zsh]
     end
 
     it 'accepts the setting from the environment' do
@@ -178,7 +178,7 @@
     end
 
     it 'rejects invalid values' do
-      invalid_values = [true, '', 'all', 'bash+zsh', 'fish', 'bash,', 'bash,,zsh', 'bash,bash']
+      invalid_values = [true, '', 'all', 'bash+zsh', 'ksh', 'bash,', 'bash,,zsh', 'bash,bash']
 
       invalid_values.each do |value|
         subject.completions = value