diff --git a/homeassistant/helpers/selector.py b/homeassistant/helpers/selector.py
index 9577381d92b..b4d01ef52e0 100644
--- a/homeassistant/helpers/selector.py
+++ b/homeassistant/helpers/selector.py
@@ -471,25 +471,37 @@ select_option = vol.All(
 
 @SELECTORS.register("select")
 class SelectSelector(Selector):
-    """Selector for an single-choice input select."""
+    """Selector for an single or multi-choice input select."""
 
     selector_type = "select"
 
     CONFIG_SCHEMA = vol.Schema(
         {
-            vol.Required("options"): vol.All(
-                vol.Any([str], [select_option]), vol.Length(min=1)
-            )
+            vol.Required("options"): vol.All(vol.Any([str], [select_option])),
+            vol.Optional("multiple", default=False): cv.boolean,
+            vol.Optional("custom_value", default=False): cv.boolean,
+            vol.Optional("mode"): vol.In(("list", "dropdown")),
         }
     )
 
     def __call__(self, data: Any) -> Any:
         """Validate the passed selection."""
-        if isinstance(self.config["options"][0], str):
-            options = self.config["options"]
-        else:
-            options = [option["value"] for option in self.config["options"]]
-        return vol.In(options)(vol.Schema(str)(data))
+        options = []
+        if self.config["options"]:
+            if isinstance(self.config["options"][0], str):
+                options = self.config["options"]
+            else:
+                options = [option["value"] for option in self.config["options"]]
+
+        parent_schema = vol.In(options)
+        if self.config["custom_value"]:
+            parent_schema = vol.Any(parent_schema, str)
+
+        if not self.config["multiple"]:
+            return parent_schema(vol.Schema(str)(data))
+        if not isinstance(data, list):
+            raise vol.Invalid("Value should be a list")
+        return [parent_schema(vol.Schema(str)(val)) for val in data]
 
 
 @SELECTORS.register("text")
diff --git a/tests/helpers/test_selector.py b/tests/helpers/test_selector.py
index 9e68af05487..bef95b056b4 100644
--- a/tests/helpers/test_selector.py
+++ b/tests/helpers/test_selector.py
@@ -246,7 +246,7 @@ def test_number_selector_schema(schema, valid_selections, invalid_selections):
     ),
 )
 def test_number_selector_schema_error(schema):
-    """Test select selector."""
+    """Test number selector."""
     with pytest.raises(vol.Invalid):
         selector.validate_selector({"number": schema})
 
@@ -349,7 +349,7 @@ def test_text_selector_schema(schema, valid_selections, invalid_selections):
         (
             {"options": ["red", "green", "blue"]},
             ("red", "green", "blue"),
-            ("cat", 0, None),
+            ("cat", 0, None, ["red"]),
         ),
         (
             {
@@ -359,7 +359,36 @@ def test_text_selector_schema(schema, valid_selections, invalid_selections):
                 ]
             },
             ("red", "green"),
-            ("cat", 0, None),
+            ("cat", 0, None, ["red"]),
+        ),
+        (
+            {"options": ["red", "green", "blue"], "multiple": True},
+            (["red"], ["green", "blue"], []),
+            ("cat", 0, None, "red"),
+        ),
+        (
+            {
+                "options": ["red", "green", "blue"],
+                "multiple": True,
+                "custom_value": True,
+            },
+            (["red"], ["green", "blue"], ["red", "cat"], []),
+            ("cat", 0, None, "red"),
+        ),
+        (
+            {"options": ["red", "green", "blue"], "custom_value": True},
+            ("red", "green", "blue", "cat"),
+            (0, None, ["red"]),
+        ),
+        (
+            {"options": [], "custom_value": True},
+            ("red", "cat"),
+            (0, None, ["red"]),
+        ),
+        (
+            {"options": [], "custom_value": True, "multiple": True},
+            (["red"], ["green", "blue"], []),
+            (0, None, "red"),
         ),
     ),
 )
@@ -373,7 +402,6 @@ def test_select_selector_schema(schema, valid_selections, invalid_selections):
     (
         {},  # Must have options
         {"options": {"hello": "World"}},  # Options must be a list
-        {"options": []},  # Must have at least option
         # Options must be strings or value / label pairs
         {"options": [{"hello": "World"}]},
         # Options must all be of the same type