diff --git a/docs/examples/set_titles_and_labels.ipynb b/docs/examples/set_titles_and_labels.ipynb
index 78343c7..12719a2 100644
--- a/docs/examples/set_titles_and_labels.ipynb
+++ b/docs/examples/set_titles_and_labels.ipynb
@@ -43,7 +43,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Create plot\n",
+    "# Create plot with a subtitle\n",
     "\n",
     "# Create a figure\n",
     "fig, ax = plt.subplots()\n",
@@ -55,6 +55,35 @@
     "gv.set_titles_and_labels(ax,\n",
     "                         maintitle=\"Title\",\n",
     "                         maintitlefontsize=24,\n",
+    "                         subtitle=\"Subtitle\",\n",
+    "                         xlabel=\"x\",\n",
+    "                         ylabel=\"y\",\n",
+    "                         labelfontsize=16)\n",
+    "\n",
+    "# Show the plot\n",
+    "plt.show();"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Create plot with left and right subtitles\n",
+    "\n",
+    "# Create a figure\n",
+    "fig, ax = plt.subplots()\n",
+    "\n",
+    "# Plot the example data\n",
+    "ax.plot(x, y)\n",
+    "\n",
+    "# Use geocat.viz.util convenience function to set titles and labels\n",
+    "gv.set_titles_and_labels(ax,\n",
+    "                         maintitle=\"Title\",\n",
+    "                         maintitlefontsize=24,\n",
+    "                         lefttitle=\"Left title\",\n",
+    "                         righttitle='Right title',\n",
     "                         xlabel=\"x\",\n",
     "                         ylabel=\"y\",\n",
     "                         labelfontsize=16)\n",
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index 268cc6d..1fd74d1 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -5,9 +5,12 @@
 Release Notes
 =============
 
-v2023.11.0 (Unreleased)
+v2024.1.0 (Unreleased)
 -----------------------
 
+New Features
+^^^^^^^^^^^^
+* Added subtitle functionality to `set_titles_and_labels()` by `Julia Kent`_ in (:pr:`185`)
 
 Documentation
 ^^^^^^^^^^^^^
diff --git a/src/geocat/viz/util.py b/src/geocat/viz/util.py
index 0d17191..a0e30e2 100644
--- a/src/geocat/viz/util.py
+++ b/src/geocat/viz/util.py
@@ -481,6 +481,8 @@ def set_titles_and_labels(ax: typing.Union[matplotlib.axes.Axes,
                                            cartopy.mpl.geoaxes.GeoAxesSubplot],
                           maintitle: str = None,
                           maintitlefontsize: int = 18,
+                          subtitle: str = None,
+                          subtitlefontsize: int = 18,
                           lefttitle: str = None,
                           lefttitlefontsize: int = 18,
                           righttitle: str = None,
@@ -505,6 +507,12 @@ def set_titles_and_labels(ax: typing.Union[matplotlib.axes.Axes,
     maintitlefontsize : int
         Text font size for maintitle. A default value of 18 is used if nothing is set.
 
+    subtitle: str
+        Text to use for an optional subtitle.
+
+    subtitlefontsize: int
+        Text font size for subtitle. A default value of 18 is used if nothing is set.
+
     lefttitle : str
         Text to use for an optional left-aligned title, if any. For most plots, only a maintitle is enough,
         but for some plot types, a lefttitle likely with a right-aligned title, righttitle, can be used together.
@@ -561,11 +569,17 @@ def set_titles_and_labels(ax: typing.Union[matplotlib.axes.Axes,
     """
 
     if maintitle is not None:
-        if lefttitle is not None or righttitle is not None:
+        if subtitle is not None:
+            fig = ax.get_figure()
+            fig.suptitle(maintitle, fontsize=maintitlefontsize, y=1.04)
+        elif lefttitle is not None or righttitle is not None:
             ax.set_title(maintitle, fontsize=maintitlefontsize + 2, y=1.12)
         else:
             ax.set_title(maintitle, fontsize=maintitlefontsize, y=1.04)
 
+    if subtitle is not None:
+        ax.set_title(subtitle, fontsize=subtitlefontsize)
+
     if lefttitle is not None:
         ax.set_title(lefttitle, fontsize=lefttitlefontsize, y=1.04, loc='left')