diff --git a/doc/source/getting_started/comparison/comparison_with_r.rst b/doc/source/getting_started/comparison/comparison_with_r.rst
index dfd388125708e..2957430666b8a 100644
--- a/doc/source/getting_started/comparison/comparison_with_r.rst
+++ b/doc/source/getting_started/comparison/comparison_with_r.rst
@@ -31,7 +31,7 @@ Quick Reference
 
 We'll start off with a quick reference guide pairing some common R
 operations using `dplyr
-<http://cran.r-project.org/web/packages/dplyr/index.html>`__ with
+<https://cran.r-project.org/package=dplyr>`__ with
 pandas equivalents.
 
 
diff --git a/doc/source/user_guide/visualization.rst b/doc/source/user_guide/visualization.rst
index 23207a0e11a65..2448d0e5d9930 100644
--- a/doc/source/user_guide/visualization.rst
+++ b/doc/source/user_guide/visualization.rst
@@ -1026,7 +1026,7 @@ unit interval). The point in the plane, where our sample settles to (where the
 forces acting on our sample are at an equilibrium) is where a dot representing
 our sample will be drawn. Depending on which class that sample belongs it will
 be colored differently.
-See the R package `Radviz <https://cran.r-project.org/web/packages/Radviz/>`__
+See the R package `Radviz <https://cran.r-project.org/package=Radviz/>`__
 for more information.
 
 **Note**: The "Iris" dataset is available `here <https://raw.github.com/pandas-dev/pandas/master/pandas/tests/data/iris.csv>`__.
diff --git a/doc/source/whatsnew/v0.16.0.rst b/doc/source/whatsnew/v0.16.0.rst
index f082bf656f23c..1e4ec682f0504 100644
--- a/doc/source/whatsnew/v0.16.0.rst
+++ b/doc/source/whatsnew/v0.16.0.rst
@@ -43,7 +43,7 @@ DataFrame Assign
 ^^^^^^^^^^^^^^^^
 
 Inspired by `dplyr's
-<http://cran.rstudio.com/web/packages/dplyr/vignettes/introduction.html#mutate>`__ ``mutate`` verb, DataFrame has a new
+<https://dplyr.tidyverse.org/articles/dplyr.html#mutating-operations>`__ ``mutate`` verb, DataFrame has a new
 :meth:`~pandas.DataFrame.assign` method.
 The function signature for ``assign`` is simply ``**kwargs``. The keys
 are the column names for the new fields, and the values are either a value
diff --git a/pandas/io/sas/sas.pyx b/pandas/io/sas/sas.pyx
index 0aec958d1f9bd..022c95397b76f 100644
--- a/pandas/io/sas/sas.pyx
+++ b/pandas/io/sas/sas.pyx
@@ -11,7 +11,7 @@ ctypedef unsigned short     uint16_t
 # rle_decompress decompresses data using a Run Length Encoding
 # algorithm.  It is partially documented here:
 #
-# https://cran.r-project.org/web/packages/sas7bdat/vignettes/sas7bdat.pdf
+# https://cran.r-project.org/package=sas7bdat/vignettes/sas7bdat.pdf
 cdef const uint8_t[:] rle_decompress(int result_length,
                                      const uint8_t[:] inbuff):
 
diff --git a/pandas/io/sas/sas7bdat.py b/pandas/io/sas/sas7bdat.py
index 1aaf8547cb0a4..634bdfa93ba2e 100644
--- a/pandas/io/sas/sas7bdat.py
+++ b/pandas/io/sas/sas7bdat.py
@@ -8,7 +8,7 @@
   https://github.com/BioStatMatt/sas7bdat
 
 Partial documentation of the file format:
-  https://cran.r-project.org/web/packages/sas7bdat/vignettes/sas7bdat.pdf
+  https://cran.r-project.org/package=sas7bdat/vignettes/sas7bdat.pdf
 
 Reference for binary data compression:
   http://collaboration.cmc.ec.gc.ca/science/rpn/biblio/ddj/Website/articles/CUJ/1992/9210/ross/ross.htm