diff --git a/.changeset/added-width-to-inputs.md b/.changeset/added-width-to-inputs.md
new file mode 100644
index 0000000000..949e894265
--- /dev/null
+++ b/.changeset/added-width-to-inputs.md
@@ -0,0 +1,10 @@
+---
+'@openproject/primer-view-components': minor
+---
+
+Added a "width" attribute to control how wide an input is rendered on screen.
+
+It is active for:
+
+- TextField
+- Select
diff --git a/.gitignore b/.gitignore
index f48032404c..3505ad1055 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,3 +48,6 @@ tmp/
 # Simplecov folder
 coverage/
 demo/public/assets/
+
+# IDE folders
+.idea
diff --git a/app/components/primer/alpha/text_field.pcss b/app/components/primer/alpha/text_field.pcss
index 49d622d36a..cd17e81eb3 100644
--- a/app/components/primer/alpha/text_field.pcss
+++ b/app/components/primer/alpha/text_field.pcss
@@ -216,11 +216,40 @@
   gap: var(--base-size-16);
 }
 
+/* widths */
+@define-mixin FormControl-input-width {
+  &.FormControl-input-width--auto {
+    width: auto;
+  }
+
+  &.FormControl-input-width--small {
+    width: min(256px, 100vw - 2rem);
+  }
+
+  &.FormControl-input-width--medium {
+    width: min(320px, 100vw - 2rem);
+  }
+
+  &.FormControl-input-width--large {
+    width: min(480px, 100vw - 2rem);
+  }
+
+  &.FormControl-input-width--xlarge {
+    width: min(640px, 100vw - 2rem);
+  }
+
+  &.FormControl-input-width--xxlarge {
+    width: min(960px, 100vw - 2rem);
+  }
+}
+
 /* positioning for leading/trailing items for TextInput */
 .FormControl-input-wrap {
   position: relative;
   display: grid;
 
+  @mixin FormControl-input-width;
+
   & .FormControl-input-leadingVisualWrap {
     position: absolute;
     top: var(--base-size-8);
@@ -479,6 +508,8 @@
   display: grid;
   grid-template-columns: minmax(0, auto) var(--base-size-16);
 
+  @mixin FormControl-input-width;
+
   /* mask allows for background-color to respect themes */
   &::after {
     width: var(--base-size-16);
diff --git a/app/forms/custom_width_fields_form.rb b/app/forms/custom_width_fields_form.rb
new file mode 100644
index 0000000000..f3897c16f4
--- /dev/null
+++ b/app/forms/custom_width_fields_form.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# :nodoc:
+class CustomWidthFieldsForm < ApplicationForm
+  form do |f|
+    f.text_field(
+      name: :ultimate_answer,
+      label: "Ultimate answer",
+      required: true,
+      caption: "The answer to life, the universe, and everything",
+      input_width: :medium
+    )
+
+    f.select_list(
+      name: "cities",
+      label: "Cool cities",
+      caption: "Select your favorite!",
+      include_blank: true,
+      input_width: :small
+    ) do |city_list|
+      city_list.option(label: "Lopez Island", value: "lopez_island")
+      city_list.option(label: "Bellevue", value: "bellevue")
+      city_list.option(label: "Seattle", value: "seattle")
+    end
+  end
+end
diff --git a/lib/primer/forms/dsl/input.rb b/lib/primer/forms/dsl/input.rb
index d357b5f7aa..c81d55cfa3 100644
--- a/lib/primer/forms/dsl/input.rb
+++ b/lib/primer/forms/dsl/input.rb
@@ -45,6 +45,17 @@ class Input
         }.freeze
         SIZE_OPTIONS = SIZE_MAPPINGS.keys
 
+        DEFAULT_INPUT_WIDTH = :auto
+        INPUT_WIDTH_MAPPINGS = {
+          DEFAULT_INPUT_WIDTH => "FormControl-input-width--auto",
+          :small => "FormControl-input-width--small",
+          :medium => "FormControl-input-width--medium",
+          :large => "FormControl-input-width--large",
+          :xlarge => "FormControl-input-width--xlarge",
+          :xxlarge => "FormControl-input-width--xxlarge"
+        }.freeze
+        INPUT_WIDTH_OPTIONS = INPUT_WIDTH_MAPPINGS.keys
+
         include Primer::ClassNameHelper
 
         attr_reader :builder, :form, :input_arguments, :label_arguments, :caption, :validation_message, :ids, :form_control, :base_id
@@ -73,6 +84,7 @@ def initialize(builder:, form:, **system_arguments)
           @invalid = @input_arguments.delete(:invalid)
           @full_width = @input_arguments.delete(:full_width)
           @size = @input_arguments.delete(:size)
+          @input_width = @input_arguments.delete(:input_width)
 
           # If scope_name_to_model is false, the name of the input for eg. `my_field`
           # will be `my_field` instead of the Rails default of `model[my_field]`.
@@ -152,6 +164,7 @@ def add_input_data(key, value)
         def remove_input_data(key)
           input_data.delete(key)
         end
+
         # :nocov:
 
         def merge_input_arguments!(arguments)
@@ -226,6 +239,10 @@ def size
           @size ||= SIZE_MAPPINGS.include?(@size) ? @size : DEFAULT_SIZE
         end
 
+        def input_width
+          @input_width ||= INPUT_WIDTH_MAPPINGS.include?(@input_width) ? @input_width : DEFAULT_INPUT_WIDTH
+        end
+
         def validation_messages
           @validation_messages ||=
             if validation_message
@@ -257,6 +274,7 @@ def type
         def to_component
           raise_for_abstract_method!(__method__)
         end
+
         # :nocov:
 
         def focusable?
@@ -309,6 +327,7 @@ def aria_join(*values)
         def raise_for_abstract_method!(method_name)
           raise NotImplementedError, "subclasses must implement ##{method_name}."
         end
+
         # :nocov:
       end
     end
diff --git a/lib/primer/forms/select.rb b/lib/primer/forms/select.rb
index 6c76a789f1..5efcdeaf1d 100644
--- a/lib/primer/forms/select.rb
+++ b/lib/primer/forms/select.rb
@@ -13,8 +13,11 @@ def initialize(input:)
           Primer::Forms::Dsl::Input::SIZE_MAPPINGS[@input.size]
         )
 
+        wrap_classes = ["FormControl-select-wrap"]
+        wrap_classes << Primer::Forms::Dsl::Input::INPUT_WIDTH_MAPPINGS[@input.input_width] if @input.input_width
+
         @field_wrap_arguments = {
-          class: "FormControl-select-wrap",
+          class: class_names(wrap_classes),
           hidden: @input.hidden?
         }
       end
diff --git a/lib/primer/forms/text_field.rb b/lib/primer/forms/text_field.rb
index 1840f92434..789dbcdd9e 100644
--- a/lib/primer/forms/text_field.rb
+++ b/lib/primer/forms/text_field.rb
@@ -19,14 +19,16 @@ def initialize(input:)
           Primer::Forms::Dsl::Input::SIZE_MAPPINGS[@input.size]
         )
 
-        @field_wrap_arguments = {
-          class: class_names(
-            "FormControl-input-wrap",
-            INPUT_WRAP_SIZE[input.size],
-            "FormControl-input-wrap--trailingAction": @input.show_clear_button?,
-            "FormControl-input-wrap--leadingVisual": @input.leading_visual?
-          ),
+        wrap_classes = [
+          "FormControl-input-wrap",
+          INPUT_WRAP_SIZE[input.size],
+          { "FormControl-input-wrap--trailingAction": @input.show_clear_button? },
+          { "FormControl-input-wrap--leadingVisual": @input.leading_visual? }
+        ]
+        wrap_classes << Primer::Forms::Dsl::Input::INPUT_WIDTH_MAPPINGS[@input.input_width] if @input.input_width
 
+        @field_wrap_arguments = {
+          class: class_names(wrap_classes),
           hidden: @input.hidden?
         }
       end
diff --git a/previews/primer/alpha/select_preview.rb b/previews/primer/alpha/select_preview.rb
index 99f289b834..8efa3092a2 100644
--- a/previews/primer/alpha/select_preview.rb
+++ b/previews/primer/alpha/select_preview.rb
@@ -17,6 +17,7 @@ class SelectPreview < ViewComponent::Preview
       # @param disabled toggle
       # @param invalid toggle
       # @param validation_message text
+      # @param input_width [Symbol] select [auto, small, medium, large, xlarge, xxlarge]
       def playground(
         name: "my-select-list",
         id: "my-select-list",
@@ -28,7 +29,8 @@ def playground(
         full_width: false,
         disabled: false,
         invalid: false,
-        validation_message: nil
+        validation_message: nil,
+        input_width: nil
       )
         system_arguments = {
           name: name,
@@ -41,7 +43,8 @@ def playground(
           full_width: full_width,
           disabled: disabled,
           invalid: invalid,
-          validation_message: validation_message
+          validation_message: validation_message,
+          input_width: input_width
         }
 
         render(Primer::Alpha::Select.new(**system_arguments)) do |component|
diff --git a/previews/primer/alpha/text_field_preview.rb b/previews/primer/alpha/text_field_preview.rb
index 7fd6836bda..6640542a55 100644
--- a/previews/primer/alpha/text_field_preview.rb
+++ b/previews/primer/alpha/text_field_preview.rb
@@ -23,6 +23,7 @@ class TextFieldPreview < ViewComponent::Preview
       # @param inset toggle
       # @param monospace toggle
       # @param leading_visual_icon octicon
+      # @param input_width [Symbol] select [auto, small, medium, large, xlarge, xxlarge]
       def playground(
         name: "my-text-field",
         id: "my-text-field",
@@ -40,7 +41,8 @@ def playground(
         placeholder: nil,
         inset: false,
         monospace: false,
-        leading_visual_icon: nil
+        leading_visual_icon: nil,
+        input_width: nil
       )
         system_arguments = {
           name: name,
@@ -58,7 +60,8 @@ def playground(
           validation_message: validation_message,
           placeholder: placeholder,
           inset: inset,
-          monospace: monospace
+          monospace: monospace,
+          input_width: input_width
         }
 
         if leading_visual_icon
diff --git a/previews/primer/forms_preview.rb b/previews/primer/forms_preview.rb
index e326710c04..b6b29feeb0 100644
--- a/previews/primer/forms_preview.rb
+++ b/previews/primer/forms_preview.rb
@@ -7,6 +7,8 @@ def single_text_field_form; end
 
     def multi_text_field_form; end
 
+    def custom_width_fields_form; end
+
     def text_field_and_checkbox_form; end
 
     def horizontal_form; end
diff --git a/previews/primer/forms_preview/custom_width_fields_form.html.erb b/previews/primer/forms_preview/custom_width_fields_form.html.erb
new file mode 100644
index 0000000000..28faebf35b
--- /dev/null
+++ b/previews/primer/forms_preview/custom_width_fields_form.html.erb
@@ -0,0 +1,3 @@
+<%= primer_form_with(url: "/foo") do |f| %>
+  <%= render(CustomWidthFieldsForm.new(f)) %>
+<% end %>
diff --git a/test/lib/primer/forms/text_field_input_test.rb b/test/lib/primer/forms/text_field_input_test.rb
index 51c624eece..22d293b883 100644
--- a/test/lib/primer/forms/text_field_input_test.rb
+++ b/test/lib/primer/forms/text_field_input_test.rb
@@ -18,6 +18,18 @@ def test_hidden_text_field
     assert_selector "input[type=text]#foo", visible: :hidden
   end
 
+  def test_medium_width_text_field
+    render_in_view_context do
+      primer_form_with(url: "/foo") do |f|
+        render_inline_form(f) do |text_field_form|
+          text_field_form.text_field(name: :foo, label: "Foo", input_width: :medium)
+        end
+      end
+    end
+
+    assert_selector "div.FormControl-input-width--medium"
+  end
+
   def test_no_error_markup
     model = DeepThought.new(41)
     model.valid? # populate validation error messages
diff --git a/test/lib/primer/forms_test.rb b/test/lib/primer/forms_test.rb
index 15548fa597..3010dd013a 100644
--- a/test/lib/primer/forms_test.rb
+++ b/test/lib/primer/forms_test.rb
@@ -6,6 +6,13 @@
 class Primer::FormsTest < Minitest::Test
   include Primer::ComponentTestHelpers
 
+  def test_custom_width_fields
+    render_inline Primer::FormTestComponent.new(form_class: CustomWidthFieldsForm)
+
+    assert_selector "div.FormControl-input-width--medium"
+    assert_selector "div.FormControl-input-width--small"
+  end
+
   def test_renders_correct_form_structure
     render_preview :single_text_field_form