matplotlib
diff --git a/‎doc/users/whats_new/style_changes.rst
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diff --git a/‎lib/matplotlib/axes/_axes.py
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diff --git a/‎lib/matplotlib/pyplot.py
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@@ -28,6 +28,13 @@ Colors
 - Grid lines are light grey solid 1pt lines.  They are no longer dashed by
   default.
 
+Plots
+`````
+
+- The default size of the elements in a scatter plot is now based on
+  the rcParam ``lines.markersize`` so it is consistent with ``plot(X,
+  Y, 'o')``.  The old value was 20.
+
 Plot layout
 ```````````
 
 
@@ -3726,7 +3726,7 @@ def dopatch(xs, ys, **kwargs):
                                         'facecolors', 'color'],
                          label_namer="y")
     @docstring.dedent_interpd
-    def scatter(self, x, y, s=20, c=None, marker='o', cmap=None, norm=None,
+    def scatter(self, x, y, s=None, c=None, marker='o', cmap=None, norm=None,
                 vmin=None, vmax=None, alpha=None, linewidths=None,
                 verts=None, edgecolors=None,
                 **kwargs):
@@ -3861,6 +3861,12 @@ def scatter(self, x, y, s=20, c=None, marker='o', cmap=None, norm=None,
         if x.size != y.size:
             raise ValueError("x and y must be the same size")
 
+        if s is None:
+            if rcParams['_internal.classic_mode']:
+                s = 20
+            else:
+                s = rcParams['lines.markersize'] ** 2.0
+
         s = np.ma.ravel(s)  # This doesn't have to match x, y in size.
 
         # After this block, c_array will be None unless
 
@@ -3138,7 +3138,7 @@ def quiverkey(*args, **kw):
 # This function was autogenerated by boilerplate.py.  Do not edit as
 # changes will be lost
 @_autogen_docstring(Axes.scatter)
-def scatter(x, y, s=20, c=None, marker='o', cmap=None, norm=None, vmin=None,
+def scatter(x, y, s=None, c=None, marker='o', cmap=None, norm=None, vmin=None,
             vmax=None, alpha=None, linewidths=None, verts=None, edgecolors=None,
             hold=None, data=None, **kwargs):
     ax = gca()