diff --git a/daterangepicker.js b/daterangepicker.js
index 9b71ac63..280c8ab8 100644
--- a/daterangepicker.js
+++ b/daterangepicker.js
@@ -48,6 +48,7 @@
         this.singleDatePicker = false;
         this.showDropdowns = false;
         this.showWeekNumbers = false;
+        this.showISOWeekNumbers = false;
         this.timePicker = false;
         this.timePicker24Hour = false;
         this.timePickerIncrement = 1;
@@ -217,6 +218,9 @@
         if (typeof options.showWeekNumbers === 'boolean')
             this.showWeekNumbers = options.showWeekNumbers;
 
+        if (typeof options.showISOWeekNumbers === 'boolean')
+            this.showISOWeekNumbers = options.showISOWeekNumbers;
+
         if (typeof options.buttonClasses === 'string')
             this.buttonClasses = options.buttonClasses;
 
@@ -672,7 +676,7 @@
             html += '<tr>';
 
             // add empty cell for week number
-            if (this.showWeekNumbers)
+            if (this.showWeekNumbers || this.showISOWeekNumbers)
                 html += '<th></th>';
 
             if ((!minDate || minDate.isBefore(calendar.firstDay)) && (!this.linkedCalendars || side == 'left')) {
@@ -727,7 +731,7 @@
             html += '<tr>';
 
             // add week number label
-            if (this.showWeekNumbers)
+            if (this.showWeekNumbers || this.showISOWeekNumbers)
                 html += '<th class="week">' + this.locale.weekLabel + '</th>';
 
             $.each(this.locale.daysOfWeek, function(index, dayOfWeek) {
@@ -753,6 +757,8 @@
                 // add week number
                 if (this.showWeekNumbers)
                     html += '<td class="week">' + calendar[row][0].week() + '</td>';
+                else if (this.showISOWeekNumbers)
+                    html += '<td class="week">' + calendar[row][0].isoWeek() + '</td>';
 
                 for (var col = 0; col < 7; col++) {
 
diff --git a/demo.html b/demo.html
index 4d6439dd..e5be1bfe 100644
--- a/demo.html
+++ b/demo.html
@@ -81,6 +81,12 @@ <h1 style="margin: 0 0 20px 0">Configuration Builder</h1>
                 </label>
               </div>
 
+              <div class="checkbox">
+                <label>
+                  <input type="checkbox" id="showISOWeekNumbers"> showISOWeekNumbers
+                </label>
+              </div>
+
               <div class="checkbox">
                 <label>
                   <input type="checkbox" id="timePicker"> timePicker
@@ -248,6 +254,9 @@ <h4>Configuration</h4>
           if ($('#showWeekNumbers').is(':checked'))
             options.showWeekNumbers = true;
 
+          if ($('#showISOWeekNumbers').is(':checked'))
+            options.showISOWeekNumbers = true;
+
           if ($('#timePicker').is(':checked'))
             options.timePicker = true;
           
diff --git a/website/index.html b/website/index.html
index 34411b85..109a50cd 100644
--- a/website/index.html
+++ b/website/index.html
@@ -449,6 +449,12 @@ <h2>Configuration Generator</h2>
                                 </label>
                               </div>
 
+                              <div class="checkbox">
+                                <label>
+                                  <input type="checkbox" id="showISOWeekNumbers"> showISOWeekNumbers
+                                </label>
+                              </div>
+
                               <div class="checkbox">
                                 <label>
                                   <input type="checkbox" id="timePicker"> timePicker
@@ -594,7 +600,10 @@ <h2>Options</h2>
                                 <code>showDropdowns</code>: (boolean) Show year and month select boxes above calendars to jump to a specific month and year
                             </li>
                             <li>
-                                <code>showWeekNumbers</code>: (boolean) Show week numbers at the start of each week on the calendars
+                                <code>showWeekNumbers</code>: (boolean) Show localized week numbers at the start of each week on the calendars
+                            </li>
+                            <li>
+                                <code>showWeekNumbers</code>: (boolean) Show ISO week numbers at the start of each week on the calendars
                             </li>
                             <li>
                                 <code>timePicker</code>: (boolean) Allow selection of dates with times, not just dates
diff --git a/website/website.js b/website/website.js
index 4baab5e6..cfd9cf9e 100644
--- a/website/website.js
+++ b/website/website.js
@@ -36,6 +36,9 @@ $(document).ready(function() {
       if ($('#showWeekNumbers').is(':checked'))
         options.showWeekNumbers = true;
 
+      if ($('#showISOWeekNumbers').is(':checked'))
+        options.showISOWeekNumbers = true;
+
       if ($('#timePicker').is(':checked'))
         options.timePicker = true;