diff --git a/src/Humanizer.Tests/Localisation/ar/NumberToWordsTests.cs b/src/Humanizer.Tests/Localisation/ar/NumberToWordsTests.cs
new file mode 100644
index 000000000..33e82ae3e
--- /dev/null
+++ b/src/Humanizer.Tests/Localisation/ar/NumberToWordsTests.cs
@@ -0,0 +1,23 @@
+using Xunit;
+using Xunit.Extensions;
+
+namespace Humanizer.Tests.Localisation.ar
+{
+    public class NumberToWordsTests : AmbientCulture
+    {
+        public NumberToWordsTests() : base("ar") { }
+
+        [Theory]
+        [InlineData("صفر", 0)]
+        [InlineData("واحد", 1)]
+        [InlineData("اثنان", 2)]
+        [InlineData("اثنان و عشرون", 22)]
+        [InlineData("أحد عشر", 11)]
+        [InlineData("ثلاثة آلاف و خمس مئة و واحد", 3501)]
+        [InlineData("مليون و واحد", 1000001)]
+        public void ToWordsArabic(string expected, int number)
+        {
+            Assert.Equal(expected, number.ToWords());
+        }
+    }
+}
diff --git a/src/Humanizer/NumberToWordsExtension.cs b/src/Humanizer/NumberToWordsExtension.cs
index 6464350e9..62ccf9f5b 100644
--- a/src/Humanizer/NumberToWordsExtension.cs
+++ b/src/Humanizer/NumberToWordsExtension.cs
@@ -1,17 +1,33 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 
 namespace Humanizer
 {
+    /// <summary>
+    /// Transform a number into words; e.g. 1 => one
+    /// </summary>
     public static class NumberToWordsExtension
     {
-        // http://stackoverflow.com/questions/2729752/converting-numbers-in-to-words-c-sharp
         /// <summary>
         /// 3501.ToWords() -> "three thousand five hundred and one"
         /// </summary>
         /// <param name="number">Number to be turned to words</param>
         /// <returns></returns>
         public static string ToWords(this int number)
+        {
+            switch (CultureInfo.CurrentUICulture.TwoLetterISOLanguageName)
+            {
+                case "ar":
+                    return ToArabicWords(number);
+                case "en":
+                    return ToEnglishWords(number);
+                default:
+                    throw new Exception();
+            }
+        }
+
+        private static string ToEnglishWords(int number)
         {
             if (number == 0)
                 return "zero";
@@ -60,5 +76,113 @@ public static string ToWords(this int number)
 
             return string.Join(" ", parts.ToArray());
         }
+
+        private static string ToArabicWords(int number)
+        {
+            string[] arabicGroup = { "مئة", "ألف", "مليون", "مليار", "تريليون", "كوادريليون", "كوينتليون", "سكستيليون" };
+            string[] arabicAppendedGroup = { "", "ألفاً", "مليوناً", "ملياراً", "تريليوناً", "كوادريليوناً", "كوينتليوناً", "سكستيليوناً" };
+            string[] arabicPluralGroups = { "", "آلاف", "ملايين", "مليارات", "تريليونات", "كوادريليونات", "كوينتليونات", "سكستيليونات" };
+            string[] onesGroup = { "", "واحد", "اثنان", "ثلاثة", "أربعة", "خمسة", "ستة", "سبعة", "ثمانية", "تسعة", "عشرة", "أحد عشر", "اثنا عشر", "ثلاثة عشر", "أربعة عشر", "خمسة عشر", "ستة عشر", "سبعة عشر", "ثمانية عشر", "تسعة عشر" };
+            string[] tensGroup = { "", "عشرة", "عشرون", "ثلاثون", "أربعون", "خمسون", "ستون", "سبعون", "ثمانون", "تسعون" };
+            string[] hundredsGroup = { "", "مئة", "مئتان", "ثلاث مئة", "أربع مئة", "خمس مئة", "ست مئة", "سبع مئة", "ثمان مئة", "تسع مئة" };
+            string[] arabicAppendedTwos = { "مئتان", "ألفان", "مليونان", "ملياران", "تريليونان", "كوادريليونان", "كوينتليونان", "سكستيليونلن" };
+            string[] arabicTwos = { "مئتان", "ألفان", "مليونان", "ملياران", "تريليونان", "كوادريليونان", "كوينتليونان", "سكستيليونان" };
+
+            if (number == 0)
+                return "صفر";
+
+            string result = String.Empty;
+            int groupLevel = 0;
+
+            while (number >= 1)
+            {
+                int groupNumber = number % 1000;
+                number /= 1000;
+
+                int tens = groupNumber % 100;
+                int hundreds = groupNumber / 100;
+                string process = String.Empty;
+
+                if (hundreds > 0)
+                {
+                    if (tens == 0 && hundreds == 2)
+                        process = arabicAppendedTwos[0];
+                    else
+                        process = hundredsGroup[hundreds];
+                }
+
+                if (tens > 0)
+                {
+                    if (tens < 20)
+                    {
+                        if (tens == 2 && hundreds == 0 && groupLevel > 0)
+                        {
+                            if (number == 2000 || number == 2000000 || number == 2000000000)
+                                process = arabicAppendedTwos[groupLevel];
+                            else
+                                process = arabicTwos[groupLevel];
+                        }
+                        else
+                        {
+                            if (process != String.Empty)
+                                process += " و ";
+
+                            if (tens == 1 && groupLevel > 0 && hundreds == 0)
+                                process += " ";
+                            else
+                                process += onesGroup[tens];
+                        }
+                    }
+                    else
+                    {
+                        int ones = tens % 10;
+                        tens = (tens / 10);
+
+                        if (ones > 0)
+                        {
+                            if (process != String.Empty)
+                                process += " و ";
+
+                            process += onesGroup[ones];
+                        }
+
+                        if (process != String.Empty)
+                            process += " و ";
+
+                        process += tensGroup[tens];
+                    }
+                }
+
+                if (process != String.Empty)
+                {
+                    if (groupLevel > 0)
+                    {
+                        if (result != String.Empty)
+                            result = String.Format("{0} {1}", "و", result);
+
+                        if (groupNumber != 2)
+                        {
+                            if (groupNumber % 100 != 1)
+                            {
+                                if (groupNumber >= 3 && groupNumber <= 10)
+                                    result = String.Format("{0} {1}", arabicPluralGroups[groupLevel], result);
+                                else
+                                {
+                                    result = String.Format("{0} {1}", result != String.Empty ? arabicAppendedGroup[groupLevel] : arabicGroup[groupLevel], result);
+                                }
+                            }
+                            else
+                            {
+                                result = String.Format("{0} {1}", arabicGroup[groupLevel], result);
+                            }
+                        }
+                    }
+                    result = String.Format("{0} {1}", process, result);
+                }
+                groupLevel++;
+            }
+
+            return result.Trim();
+        }
     }
 }