diff --git a/README.md b/README.md
index 5d868003..db114bd7 100644
--- a/README.md
+++ b/README.md
@@ -236,6 +236,7 @@ The current configuration options are:
 |---------------------------|------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `default_form_attributes` | {} | `bootstrap_form` versions 3 and 4 added a role="form" attribute to all forms. The W3C validator will raise a **warning** on forms with a role="form" attribute. `bootstrap_form` version 5 drops this attribute by default. Set this option to `{ role: "form" }` to make forms non-compliant with W3C, but generate the `role="form"` attribute like `bootstrap_form` versions 3 and 4. |
 | `group_around_collections` | false | Historically, `bootstrap_form` generated a wrapper around `collection_checkboxes` and `collection_radio_buttons` using the same `form_group` as individual controls used. This markup caused accessibility problems. Setting `group_around_collections = true` will generate collections of checkboxes and radio buttons wrapper in a `<fieldset>` with the text as a `<legend>` (https://www.w3.org/WAI/tutorials/forms/grouping/). This _will_ make visible changes to pages that use the collection methods.<br/><br/>The default for this option will be changed to `true` in a future version. |
+| `turbo_submits_with` | {} | Add custom content to a submit button while the request is processing. Try `c.turbo_submits_with = :spinner` to use the built-in spinner, or pass a custom HTML string. Caveat: Only works on `form.primary` or `form.button` as `form.submit` renders a `input` field which only accepts a string and not an HTML element. Settings this also forces `render_as_button` on `form.primary` |
 
 Example:
 
diff --git a/gemfiles/8.0.gemfile b/gemfiles/8.0.gemfile
index adbc130f..74dd2398 100644
--- a/gemfiles/8.0.gemfile
+++ b/gemfiles/8.0.gemfile
@@ -3,9 +3,9 @@ eval File.read(gems), binding, gems # rubocop: disable Security/Eval
 
 gem "bigdecimal" if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0")
 gem "drb" if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0")
+gem "json", "~> 2.21"
 gem "minitest", "~> 5.0"
 gem "mutex_m" if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0")
 gem "propshaft"
 gem "rails", "~> 8.0.1"
 gem "sqlite3"
-gem "json", "~> 2.21"
diff --git a/lib/bootstrap_form/configuration.rb b/lib/bootstrap_form/configuration.rb
index fdd2e0d2..e5695ed2 100644
--- a/lib/bootstrap_form/configuration.rb
+++ b/lib/bootstrap_form/configuration.rb
@@ -25,6 +25,27 @@ def default_form_attributes
       MESSAGE
       BootstrapForm.config.default_form_attributes
     end
+
+    def turbo_submits_with=(value)
+      case value
+      when nil
+        @turbo_submits_with = nil
+      when :spinner, "spinner"
+        @turbo_submits_with = '<div class="spinner-border d-block mx-auto" role="status" ' \
+                              'style="--bs-spinner-width: 1lh; --bs-spinner-height: 1lh;">' \
+                              '<span class="visually-hidden">Loading...</span></div>'
+      when Symbol, String
+        @turbo_submits_with = value.to_s
+      else
+        raise ArgumentError, "Unsupported turbo_submits_with #{value.inspect}"
+      end
+    end
+
+    def turbo_submits_with
+      return @turbo_submits_with if defined? @turbo_submits_with
+
+      nil
+    end
   end
 
   mattr_accessor :config, default: ActiveSupport::OrderedOptions.new
diff --git a/lib/bootstrap_form/inputs/submit.rb b/lib/bootstrap_form/inputs/submit.rb
index 24c196d2..bfade1f7 100644
--- a/lib/bootstrap_form/inputs/submit.rb
+++ b/lib/bootstrap_form/inputs/submit.rb
@@ -4,6 +4,8 @@ module BootstrapForm
   module Inputs
     module Submit
       def button(value=nil, options={}, &)
+        turbo_submits_with = BootstrapForm.config.turbo_submits_with
+        options[:data] = { turbo_submits_with: turbo_submits_with } if turbo_submits_with
         value = setup_css_class "btn btn-secondary", value, options
         super
       end
@@ -16,7 +18,7 @@ def submit(value=nil, options={})
       def primary(value=nil, options={}, &block)
         value = setup_css_class "btn btn-primary", value, options
 
-        if options[:render_as_button] || block
+        if options[:render_as_button] || block || BootstrapForm.config.turbo_submits_with
           options.except! :render_as_button
           button(value, options, &block)
         else