diff --git a/collections/IDict.cs b/collections/IDict.cs
new file mode 100644
index 0000000..e9b7245
--- /dev/null
+++ b/collections/IDict.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Collections;
+namespace ln.types.collections
+{
+    public interface IDict<K,V> : IDict
+    {
+        V this[K key] { get; set; }
+
+        void Add(K key, V value);
+        void Remove(K key);
+
+        bool ContainsKey(K key);
+
+        IEnumerable<K> Keys { get; }
+        IEnumerable<V> Values { get; }
+    }
+
+    public interface IDict
+    {
+        object this[object key] { get; set; }
+
+        void Add(object key, object value);
+        void Remove(object key);
+
+        bool ContainsKey(object key);
+
+        IEnumerable Keys { get; }
+        IEnumerable Values { get; }
+    }
+}