diff --git a/applications/test/HashSet/Test-hashSet.C b/applications/test/HashSet/Test-hashSet.C
index 99eb174162..e40d255adf 100644
--- a/applications/test/HashSet/Test-hashSet.C
+++ b/applications/test/HashSet/Test-hashSet.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -35,23 +35,19 @@ using namespace Foam;
 
 int main(int argc, char *argv[])
 {
-    wordHashSet setA(0);
+    wordHashSet setA{ "kjhk", "kjhk"};
+
     HashTable<label, word> tableA;
-
-    HashTable<nil> tableB;
-    Map<label> mapA;
-
-    setA.insert("kjhk");
-    setA.insert("kjhk2");
-
     tableA.insert("value1", 1);
     tableA.insert("value2", 2);
     tableA.insert("value3", 3);
 
+    HashTable<nil> tableB;
     tableB.insert("value4", nil());
     tableB.insert("value5", nil());
     tableB.insert("value6", nil());
 
+    Map<label> mapA;
     mapA.set(1, 1);
     mapA.set(2, 2);
     mapA.set(3, 3);
diff --git a/src/OpenFOAM/containers/HashTables/HashSet/HashSet.C b/src/OpenFOAM/containers/HashTables/HashSet/HashSet.C
index 9273ead254..73886cb9b4 100644
--- a/src/OpenFOAM/containers/HashTables/HashSet/HashSet.C
+++ b/src/OpenFOAM/containers/HashTables/HashSet/HashSet.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2019 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -77,6 +77,21 @@ Foam::HashSet<Key, Hash>::HashSet
 }
 
 
+template<class Key, class Hash>
+Foam::HashSet<Key, Hash>::HashSet
+(
+    std::initializer_list<Key> lst
+)
+:
+    HashTable<nil, Key, Hash>(lst.size())
+{
+    for (const Key& key : lst)
+    {
+        this->insert(key);
+    }
+}
+
+
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 template<class Key, class Hash>
diff --git a/src/OpenFOAM/containers/HashTables/HashSet/HashSet.H b/src/OpenFOAM/containers/HashTables/HashSet/HashSet.H
index 17c8b35051..e58aeff4da 100644
--- a/src/OpenFOAM/containers/HashTables/HashSet/HashSet.H
+++ b/src/OpenFOAM/containers/HashTables/HashSet/HashSet.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2019 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -100,6 +100,9 @@ public:
         template<class AnyType, class AnyHash>
         HashSet(const HashTable<AnyType, Key, AnyHash>&);
 
+        //- Construct from an initializer list
+        HashSet(std::initializer_list<Key>);
+
 
     // Member Functions