diff --git a/include/etl/span.h b/include/etl/span.h
index 7aa11c960..acf76f1d5 100644
--- a/include/etl/span.h
+++ b/include/etl/span.h
@@ -71,8 +71,10 @@ namespace etl
     typedef T*                               pointer;
     typedef const T*                         const_pointer;
 
-    typedef T*                                     iterator;
-    typedef ETL_OR_STD::reverse_iterator<iterator> reverse_iterator;
+    typedef T*                                           iterator;
+    typedef const T*                                     const_iterator;
+    typedef ETL_OR_STD::reverse_iterator<iterator>       reverse_iterator;
+    typedef ETL_OR_STD::reverse_iterator<const_iterator> const_reverse_iterator;
 
     typedef etl::circular_iterator<pointer>                                circular_iterator;
     typedef etl::circular_iterator<ETL_OR_STD::reverse_iterator<pointer> > reverse_circular_iterator;
@@ -185,6 +187,14 @@ namespace etl
       return pbegin;
     }
 
+    //*************************************************************************
+    /// Returns a const iterator to the beginning of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_iterator cbegin() const ETL_NOEXCEPT
+    {
+      return pbegin;
+    }
+
     //*************************************************************************
     /// Returns an iterator to the beginning of the span.
     //*************************************************************************
@@ -201,6 +211,14 @@ namespace etl
       return circular_iterator(begin(), end());
     }
 
+    //*************************************************************************
+    /// Returns a const iterator to the end of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_iterator cend() const ETL_NOEXCEPT
+    {
+      return (pbegin + Extent);
+    }
+
     //*************************************************************************
     /// Returns an iterator to the end of the span.
     //*************************************************************************
@@ -209,6 +227,14 @@ namespace etl
       return (pbegin + Extent);
     }
 
+    //*************************************************************************
+    // Returns a const reverse iterator to the reverse beginning of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_reverse_iterator crbegin() const ETL_NOEXCEPT
+    {
+      return const_reverse_iterator((pbegin + Extent));
+    }
+
     //*************************************************************************
     // Returns an reverse iterator to the reverse beginning of the span.
     //*************************************************************************
@@ -225,6 +251,14 @@ namespace etl
       return reverse_circular_iterator(rbegin(), rend());
     }
 
+    //*************************************************************************
+    /// Returns a const reverse iterator to the end of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_reverse_iterator crend() const ETL_NOEXCEPT
+    {
+      return const_reverse_iterator(pbegin);
+    }
+
     //*************************************************************************
     /// Returns a reverse iterator to the end of the span.
     //*************************************************************************
@@ -413,8 +447,10 @@ namespace etl
     typedef T*       pointer;
     typedef const T* const_pointer;
     
-    typedef T*                                     iterator;
-    typedef ETL_OR_STD::reverse_iterator<iterator> reverse_iterator;
+    typedef T*                                           iterator;
+    typedef const T*                                     const_iterator;
+    typedef ETL_OR_STD::reverse_iterator<iterator>       reverse_iterator;
+    typedef ETL_OR_STD::reverse_iterator<const_iterator> const_reverse_iterator;
 
     typedef etl::circular_iterator<pointer>                                circular_iterator;
     typedef etl::circular_iterator<ETL_OR_STD::reverse_iterator<pointer> > reverse_circular_iterator;
@@ -544,6 +580,14 @@ namespace etl
       return pbegin;
     }
 
+    //*************************************************************************
+    /// Returns a const iterator to the beginning of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_iterator cbegin() const ETL_NOEXCEPT
+    {
+      return pbegin;
+    }
+
     //*************************************************************************
     /// Returns an iterator to the beginning of the span.
     //*************************************************************************
@@ -560,6 +604,14 @@ namespace etl
       return circular_iterator(begin(), end());
     }
 
+    //*************************************************************************
+    /// Returns a const iterator to the end of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_iterator cend() const ETL_NOEXCEPT
+    {
+      return pend;
+    }
+
     //*************************************************************************
     /// Returns an iterator to the end of the span.
     //*************************************************************************
@@ -576,6 +628,14 @@ namespace etl
       return reverse_iterator(pend);
     }
 
+    //*************************************************************************
+    // Returns a const reverse iterator to the reverse beginning of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_reverse_iterator crbegin() const ETL_NOEXCEPT
+    {
+      return const_reverse_iterator(pend);
+    }
+
     //*************************************************************************
     /// Returns a reverse circular iterator to the end of the span.
     //*************************************************************************
@@ -584,6 +644,14 @@ namespace etl
       return reverse_circular_iterator(rbegin(), rend());
     }
 
+    //*************************************************************************
+    /// Returns a const reverse iterator to the end of the span.
+    //*************************************************************************
+    ETL_NODISCARD ETL_CONSTEXPR const_reverse_iterator crend() const ETL_NOEXCEPT
+    {
+      return const_reverse_iterator(pbegin);
+    }
+
     //*************************************************************************
     /// Returns a reverse iterator to the end of the span.
     //*************************************************************************
diff --git a/test/test_span_dynamic_extent.cpp b/test/test_span_dynamic_extent.cpp
index 300ee58c5..7a1546700 100644
--- a/test/test_span_dynamic_extent.cpp
+++ b/test/test_span_dynamic_extent.cpp
@@ -409,15 +409,19 @@ namespace
       View  view(etldata.begin(), etldata.end());
       CView cview(etldata.begin(), etldata.end());
 
+      CHECK_EQUAL(etldata.cbegin(), view.cbegin());
       CHECK_EQUAL(etldata.begin(), view.begin());
       CHECK_EQUAL(etldata.begin(), cview.begin());
 
+      CHECK_EQUAL(etldata.cend(), view.crbegin().base());
       CHECK_EQUAL(etldata.end(), view.rbegin().base());
       CHECK_EQUAL(etldata.end(), cview.rbegin().base());
 
+      CHECK_EQUAL(etldata.cend(), view.cend());
       CHECK_EQUAL(etldata.end(), view.end());
       CHECK_EQUAL(etldata.end(), cview.end());
 
+      CHECK_EQUAL(etldata.cbegin(), view.crend().base());
       CHECK_EQUAL(etldata.begin(), view.rend().base());
       CHECK_EQUAL(etldata.begin(), cview.rend().base());
     }
diff --git a/test/test_span_fixed_extent.cpp b/test/test_span_fixed_extent.cpp
index 2c760783a..33e8a6f56 100644
--- a/test/test_span_fixed_extent.cpp
+++ b/test/test_span_fixed_extent.cpp
@@ -397,15 +397,19 @@ namespace
       View  view(etldata.begin(), etldata.end());
       CView cview(etldata.begin(), etldata.end());
 
+      CHECK_EQUAL(etldata.cbegin(), view.cbegin());
       CHECK_EQUAL(etldata.begin(), view.begin());
       CHECK_EQUAL(etldata.begin(), cview.begin());
 
+      CHECK_EQUAL(etldata.cend(), view.crbegin().base());
       CHECK_EQUAL(etldata.end(), view.rbegin().base());
       CHECK_EQUAL(etldata.end(), cview.rbegin().base());
 
+      CHECK_EQUAL(etldata.cend(), view.cend());
       CHECK_EQUAL(etldata.end(), view.end());
       CHECK_EQUAL(etldata.end(), cview.end());
 
+      CHECK_EQUAL(etldata.cbegin(), view.crend().base());
       CHECK_EQUAL(etldata.begin(), view.rend().base());
       CHECK_EQUAL(etldata.begin(), cview.rend().base());
     }