diff --git a/csharp/src/Apache.Arrow/Arrays/Decimal128Array.cs b/csharp/src/Apache.Arrow/Arrays/Decimal128Array.cs
index 01724e2acda3e..0e3ec56740449 100644
--- a/csharp/src/Apache.Arrow/Arrays/Decimal128Array.cs
+++ b/csharp/src/Apache.Arrow/Arrays/Decimal128Array.cs
@@ -151,6 +151,30 @@ public Decimal128Array(ArrayData data)
             return DecimalUtility.GetDecimal(ValueBuffer, index, Scale, ByteWidth);
         }
 
+        public IList<decimal?> ToList(bool includeNulls = false)
+        {
+            var list = new List<decimal?>(Length);
+
+            for (int i = 0; i < Length; i++)
+            {
+                decimal? value = GetValue(i);
+
+                if (value.HasValue)
+                {
+                    list.Add(value.Value);
+                }
+                else
+                {
+                    if (includeNulls)
+                    {
+                        list.Add(null);
+                    }
+                }
+            }
+
+            return list;
+        }
+
         public string GetString(int index)
         {
             if (IsNull(index))
diff --git a/csharp/src/Apache.Arrow/Arrays/Decimal256Array.cs b/csharp/src/Apache.Arrow/Arrays/Decimal256Array.cs
index f314c2d6ebc9e..94a47f258280e 100644
--- a/csharp/src/Apache.Arrow/Arrays/Decimal256Array.cs
+++ b/csharp/src/Apache.Arrow/Arrays/Decimal256Array.cs
@@ -157,6 +157,30 @@ public Decimal256Array(ArrayData data)
             return DecimalUtility.GetDecimal(ValueBuffer, index, Scale, ByteWidth);
         }
 
+        public IList<decimal?> ToList(bool includeNulls = false)
+        {
+            var list = new List<decimal?>(Length);
+
+            for (int i = 0; i < Length; i++)
+            {
+                decimal? value = GetValue(i);
+
+                if (value.HasValue)
+                {
+                    list.Add(value.Value);
+                }
+                else
+                {
+                    if (includeNulls)
+                    {
+                        list.Add(null);
+                    }
+                }
+            }
+
+            return list;
+        }
+
         public string GetString(int index)
         {
             if (IsNull(index))