diff --git a/CHANGES b/CHANGES
index ce7811196..049d981bb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,8 @@
 Release 1.0 (in development)
 ============================
 
+* #200: Added ``Sphinx.add_stylesheet()``.
+
 * Added ``titlesonly`` option to ``toctree`` directive.
 
 * Removed the deprecated ``sphinx.builder`` module.
diff --git a/doc/ext/appapi.rst b/doc/ext/appapi.rst
index 6864d6bac..0a3dae8fb 100644
--- a/doc/ext/appapi.rst
+++ b/doc/ext/appapi.rst
@@ -205,6 +205,14 @@ the following public API:
 
    .. versionadded:: 0.5
 
+.. method:: Sphinx.add_stylesheet(filename)
+
+   Add *filename* to the list of CSS files that the default HTML template will
+   include.  Like for :meth:`add_javascript`, the filename must be relative to
+   the HTML static path.
+
+   .. versionadded:: 1.0
+
 .. method:: Sphinx.add_lexer(alias, lexer)
 
    Use *lexer*, which must be an instance of a Pygments lexer class, to
diff --git a/sphinx/application.py b/sphinx/application.py
index 7e926e572..b9c56d9f3 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -323,6 +323,11 @@ class Sphinx(object):
         StandaloneHTMLBuilder.script_files.append(
             posixpath.join('_static', filename))
 
+    def add_stylesheet(self, filename):
+        from sphinx.builders.html import StandaloneHTMLBuilder
+        StandaloneHTMLBuilder.css_files.append(
+            posixpath.join('_static', filename))
+
     def add_lexer(self, alias, lexer):
         from sphinx.highlighting import lexers
         if lexers is None:
diff --git a/sphinx/builders/html.py b/sphinx/builders/html.py
index 1edfd7231..0fc652a04 100644
--- a/sphinx/builders/html.py
+++ b/sphinx/builders/html.py
@@ -71,6 +71,8 @@ class StandaloneHTMLBuilder(Builder):
 
     # This is a class attribute because it is mutated by Sphinx.add_javascript.
     script_files = ['_static/jquery.js', '_static/doctools.js']
+    # Dito for this one.
+    css_files = []
 
     # cached publisher object for snippets
     _publisher = None
@@ -264,6 +266,7 @@ class StandaloneHTMLBuilder(Builder):
             show_source = self.config.html_show_sourcelink,
             file_suffix = self.out_suffix,
             script_files = self.script_files,
+            css_files = self.css_files,
             sphinx_version = __version__,
             style = stylename,
             rellinks = rellinks,
diff --git a/sphinx/themes/basic/layout.html b/sphinx/themes/basic/layout.html
index 5aaaeff28..dfee95ad5 100644
--- a/sphinx/themes/basic/layout.html
+++ b/sphinx/themes/basic/layout.html
@@ -101,6 +101,9 @@
     <title>{{ title|striptags }}{{ titlesuffix }}</title>
     <link rel="stylesheet" href="{{ pathto('_static/' + style, 1) }}" type="text/css" />
     <link rel="stylesheet" href="{{ pathto('_static/pygments.css', 1) }}" type="text/css" />
+    {%- for cssfile in css_files %}
+    <link rel="stylesheet" href="{{ pathto('_static/' + cssfile, 1) }}" type="text/css" />
+    {%- endfor %}
     {%- if not embedded %}
     <script type="text/javascript">
       var DOCUMENTATION_OPTIONS = {