diff --git a/viper.go b/viper.go
index a58d757..e3e7296 100644
--- a/viper.go
+++ b/viper.go
@@ -1476,6 +1476,28 @@ func (v *Viper) Set(key string, value any) {
 	deepestMap[lastKey] = value
 }
 
+// Unset deletes a key from Viper.
+// Unset is case-insensitive for a key.
+func Unset(key string) { v.Unset(key) }
+
+func (v *Viper) Unset(key string) {
+	// If alias passed in, then set the proper override
+	key = v.realKey(strings.ToLower(key))
+
+	path := strings.Split(key, v.keyDelim)
+	lastKey := strings.ToLower(path[len(path)-1])
+
+	for _, cfgMap := range []map[string]interface{}{
+		v.override, v.config, v.defaults,
+		v.kvstore,
+	} {
+		cfg := deepSearch(cfgMap, path[0:len(path)-1])
+		delete(cfg, lastKey)
+	}
+
+	delete(v.aliases, key)
+}
+
 // ReadInConfig will discover and load the configuration file from disk
 // and key/value stores, searching in one of the defined paths.
 func ReadInConfig() error { return v.ReadInConfig() }
diff --git a/viper_test.go b/viper_test.go
index f7e0787..9ccf1f1 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -513,6 +513,17 @@ func TestOverrides(t *testing.T) {
 	assert.Equal(t, 40, v.Get("age"))
 }
 
+func TestUnset(t *testing.T) {
+	SetDefault("unset", 20)
+	Set("unset", 10)
+	RegisterAlias("unset_alias", "unset")
+
+	Unset("unset")
+
+	assert.Equal(t, nil, Get("unset"))
+	assert.Equal(t, nil, Get("unset_alias"))
+}
+
 func TestDefaultPost(t *testing.T) {
 	v := New()
 	assert.NotEqual(t, "NYC", v.Get("state"))