diff --git a/app/assets/stylesheets/admin/locales/form.scss b/app/assets/stylesheets/admin/locales/form.scss
new file mode 100644
index 000000000..fee54929c
--- /dev/null
+++ b/app/assets/stylesheets/admin/locales/form.scss
@@ -0,0 +1,26 @@
+.admin .locales-form {
+  label {
+    display: table;
+  }
+
+  select {
+    width: auto;
+  }
+
+  > select + fieldset,
+  > fieldset + fieldset {
+    margin-top: $line-height / 2;
+  }
+
+  > [type="hidden"] + fieldset,
+  > fieldset + fieldset {
+    @include admin-fieldset-separator;
+    padding-top: calc(#{$line-height} / 4);
+  }
+
+  [type="submit"] {
+    @include regular-button;
+    display: block;
+    margin-top: $line-height;
+  }
+}
diff --git a/app/components/admin/locales/form_component.html.erb b/app/components/admin/locales/form_component.html.erb
new file mode 100644
index 000000000..109960c97
--- /dev/null
+++ b/app/components/admin/locales/form_component.html.erb
@@ -0,0 +1,40 @@
+<%= form_tag admin_locales_path, method: :patch, class: "locales-form" do %>
+  <% if many_available_locales? %>
+    <%= label_tag "default_locale", t("admin.locales.default") %>
+    <p class="help-text"><%= sanitize(t("admin.locales.default_help_text")) %></p>
+    <%= select_tag "default_locale", locales_options %>
+  <% else %>
+    <fieldset>
+      <legend><%= t("admin.locales.default") %></legend>
+      <p class="help-text"><%= sanitize(t("admin.locales.default_help_text")) %></p>
+
+      <div class="collection-radio-buttons">
+        <% available_locales.each do |locale| %>
+          <%= label_tag "default_locale_#{locale}" do %>
+            <%= radio_button_tag "default_locale", locale, locale == default %>
+            <%= name_for_locale(locale) %>
+          <% end %>
+        <% end %>
+      </div>
+    </fieldset>
+  <% end %>
+
+  <fieldset>
+    <legend><%= t("admin.locales.enabled") %></legend>
+    <p class="help-text"><%= t("admin.locales.enabled_help_text") %></p>
+
+    <div class="collection-check-boxes">
+      <% available_locales.each do |locale| %>
+        <%= label_tag "enabled_locales_#{locale}" do %>
+          <%= check_box_tag "enabled_locales[]",
+                            locale,
+                            enabled_locales.include?(locale),
+                            id: "enabled_locales_#{locale}" %>
+          <%= name_for_locale(locale) %>
+        <% end %>
+      <% end %>
+    </div>
+  </fieldset>
+
+  <%= submit_tag %>
+<% end %>
diff --git a/app/components/admin/locales/form_component.rb b/app/components/admin/locales/form_component.rb
new file mode 100644
index 000000000..6e96e0b8b
--- /dev/null
+++ b/app/components/admin/locales/form_component.rb
@@ -0,0 +1,30 @@
+class Admin::Locales::FormComponent < ApplicationComponent
+  attr_reader :enabled_locales, :default
+  use_helpers :name_for_locale
+
+  def initialize(enabled_locales, default:)
+    @enabled_locales = enabled_locales
+    @default = default
+  end
+
+  private
+
+    def available_locales
+      I18n.available_locales
+    end
+
+    def many_available_locales?
+      available_locales.count > select_field_threshold
+    end
+
+    def locales_options
+      options_for_select(
+        available_locales.map { |locale| [name_for_locale(locale), locale] },
+        default
+      )
+    end
+
+    def select_field_threshold
+      10
+    end
+end
diff --git a/app/components/admin/locales/show_component.html.erb b/app/components/admin/locales/show_component.html.erb
new file mode 100644
index 000000000..399df83cf
--- /dev/null
+++ b/app/components/admin/locales/show_component.html.erb
@@ -0,0 +1,4 @@
+<%= header %>
+<% provide :main_class, "admin-locales-show" %>
+
+<%= render Admin::Locales::FormComponent.new(locales, default: default) %>
diff --git a/app/components/admin/locales/show_component.rb b/app/components/admin/locales/show_component.rb
new file mode 100644
index 000000000..2625d049f
--- /dev/null
+++ b/app/components/admin/locales/show_component.rb
@@ -0,0 +1,13 @@
+class Admin::Locales::ShowComponent < ApplicationComponent
+  include Header
+  attr_reader :locales, :default
+
+  def initialize(locales, default:)
+    @locales = locales
+    @default = default
+  end
+
+  def title
+    t("admin.menu.locales")
+  end
+end
diff --git a/app/components/admin/menu_component.rb b/app/components/admin/menu_component.rb
index 480be1b89..2fb97d858 100644
--- a/app/components/admin/menu_component.rb
+++ b/app/components/admin/menu_component.rb
@@ -54,7 +54,7 @@ class Admin::MenuComponent < ApplicationComponent
     end
 
     def settings?
-      controllers_names = ["settings", "tenants", "tags", "geozones", "local_census_records", "imports"]
+      controllers_names = %w[settings tenants tags locales geozones local_census_records imports]
       controllers_names.include?(controller_name)
     end
 
@@ -462,6 +462,7 @@ class Admin::MenuComponent < ApplicationComponent
           settings_link,
           tenants_link,
           tags_link,
+          locales_link,
           geozones_link,
           local_census_records_link
         )
@@ -494,6 +495,14 @@ class Admin::MenuComponent < ApplicationComponent
       ]
     end
 
+    def locales_link
+      [
+        t("admin.menu.locales"),
+        admin_locales_path,
+        controller_name == "locales"
+      ]
+    end
+
     def geozones_link
       [
         t("admin.menu.geozones"),
diff --git a/app/controllers/admin/locales_controller.rb b/app/controllers/admin/locales_controller.rb
new file mode 100644
index 000000000..5d0088393
--- /dev/null
+++ b/app/controllers/admin/locales_controller.rb
@@ -0,0 +1,15 @@
+class Admin::LocalesController < Admin::BaseController
+  def show
+    @enabled_locales = Setting.enabled_locales
+    @default_locale = Setting.default_locale
+  end
+
+  def update
+    Setting.transaction do
+      Setting["locales.default"] = params["default_locale"]
+      Setting["locales.enabled"] = [params["default_locale"], *params["enabled_locales"]].join(" ")
+    end
+
+    redirect_to admin_locales_path, notice: t("admin.locales.update.notice")
+  end
+end
diff --git a/app/views/admin/locales/show.html.erb b/app/views/admin/locales/show.html.erb
new file mode 100644
index 000000000..bb4561ded
--- /dev/null
+++ b/app/views/admin/locales/show.html.erb
@@ -0,0 +1 @@
+<%= render Admin::Locales::ShowComponent.new(@enabled_locales, default: @default_locale) %>
diff --git a/config/locales/en/admin.yml b/config/locales/en/admin.yml
index 09d07d33a..736f767fe 100644
--- a/config/locales/en/admin.yml
+++ b/config/locales/en/admin.yml
@@ -710,6 +710,13 @@ en:
       milestones:
         index:
           title: Following
+    locales:
+      default: Default language
+      default_help_text: "This is the default language of the application, and changing it will <strong>affect every user</strong> visiting the website for the first time."
+      enabled: Enabled languages
+      enabled_help_text: The default language, selected above, will be included automatically.
+      update:
+        notice: Languages updated successfully
     managers:
       index:
         title: Managers
@@ -732,6 +739,7 @@ en:
       proposals_topics: Proposals topics
       budgets: Participatory budgets
       geozones: Geozones
+      locales: Languages
       hidden_comments: Hidden comments
       hidden_debates: Hidden debates
       hidden_proposals: Hidden proposals
diff --git a/config/locales/es/admin.yml b/config/locales/es/admin.yml
index e5d11242c..7c90832be 100644
--- a/config/locales/es/admin.yml
+++ b/config/locales/es/admin.yml
@@ -710,6 +710,13 @@ es:
       milestones:
         index:
           title: Seguimiento
+    locales:
+      default: Idioma por defecto
+      default_help_text: "Cambiar el idioma por defecto <strong>afectará a todos los usuarios</strong> que visiten la página por primera vez."
+      enabled: Idiomas habilitados
+      enabled_help_text: El idioma por defecto, seleccionado con anterioridad, se habilitará automáticamente.
+      update:
+        notice: Idiomas actualizados con éxito
     managers:
       index:
         title: Gestores
@@ -732,6 +739,7 @@ es:
       proposals_topics: Temas de propuestas
       budgets: Presupuestos participativos
       geozones: Zonas
+      locales: Idiomas
       hidden_comments: Comentarios ocultos
       hidden_debates: Debates ocultos
       hidden_proposals: Propuestas ocultas
diff --git a/config/routes/admin.rb b/config/routes/admin.rb
index 4e72dae01..c38eaf672 100644
--- a/config/routes/admin.rb
+++ b/config/routes/admin.rb
@@ -242,6 +242,7 @@ namespace :admin do
   end
 
   resources :geozones, only: [:index, :new, :create, :edit, :update, :destroy]
+  resource :locales, only: [:show, :update]
 
   namespace :site_customization do
     resources :pages, except: [:show] do
diff --git a/spec/components/admin/locales/form_component_spec.rb b/spec/components/admin/locales/form_component_spec.rb
new file mode 100644
index 000000000..2cb7e4ace
--- /dev/null
+++ b/spec/components/admin/locales/form_component_spec.rb
@@ -0,0 +1,39 @@
+require "rails_helper"
+
+describe Admin::Locales::FormComponent do
+  let(:default_locale) { :nl }
+  let(:enabled_locales) { %i[en nl] }
+
+  let(:component) do
+    Admin::Locales::FormComponent.new(enabled_locales, default: default_locale)
+  end
+
+  describe "default language selector" do
+    before { allow(I18n).to receive(:available_locales).and_return(%i[de en es nl]) }
+
+    it "renders radio buttons when there are only a few locales" do
+      render_inline component
+
+      page.find(:fieldset, "Default language") do |fieldset|
+        expect(fieldset).to have_checked_field "Nederlands", type: :radio
+        expect(fieldset).to have_unchecked_field "English", type: :radio
+        expect(fieldset).to have_unchecked_field "Español", type: :radio
+        expect(fieldset).to have_unchecked_field "Deutsch", type: :radio
+      end
+
+      expect(page).not_to have_select
+    end
+
+    it "renders a select when there are many locales" do
+      allow(component).to receive(:select_field_threshold).and_return(3)
+
+      render_inline component
+
+      expect(page).not_to have_field type: :radio
+
+      expect(page).to have_select "Default language",
+                                  options: %w[English Español Deutsch Nederlands],
+                                  selected: "Nederlands"
+    end
+  end
+end
diff --git a/spec/system/admin/locales_spec.rb b/spec/system/admin/locales_spec.rb
new file mode 100644
index 000000000..46b5ee2a2
--- /dev/null
+++ b/spec/system/admin/locales_spec.rb
@@ -0,0 +1,54 @@
+require "rails_helper"
+
+describe "Locales management", :admin do
+  scenario "Navigate to languages page and update them" do
+    allow(I18n).to receive(:available_locales).and_return(%i[de en es fr])
+    Setting["locales.default"] = "en"
+    Setting["locales.enabled"] = "en de"
+
+    visit admin_root_path
+
+    within ".locale" do
+      expect(page).to have_css "[aria-current]", exact_text: "English"
+
+      expect(page).to have_link "English"
+      expect(page).to have_link "Deutsch"
+      expect(page).not_to have_link "Français"
+      expect(page).not_to have_link "Español"
+    end
+
+    within "#admin_menu" do
+      expect(page).not_to have_link "Languages"
+
+      click_button "Settings"
+      click_link "Languages"
+
+      expect(page).to have_css "[aria-current]", exact_text: "Languages"
+      expect(page).to have_link "Languages"
+    end
+
+    within_fieldset "Default language" do
+      expect(page).to have_checked_field "English"
+
+      choose "Español"
+    end
+
+    within_fieldset "Enabled languages" do
+      uncheck "English"
+      check "Français"
+    end
+
+    click_button "Save changes"
+
+    expect(page).to have_content "Languages updated successfully"
+
+    within ".locale" do
+      expect(page).to have_css "[aria-current]", exact_text: "Español"
+
+      expect(page).to have_link "Français"
+      expect(page).to have_link "Español"
+      expect(page).to have_link "Deutsch"
+      expect(page).not_to have_link "English"
+    end
+  end
+end