diff --git a/homeassistant/components/bayesian/__init__.py b/homeassistant/components/bayesian/__init__.py
index 971ff8427ac..485592dc5e4 100644
--- a/homeassistant/components/bayesian/__init__.py
+++ b/homeassistant/components/bayesian/__init__.py
@@ -1 +1,4 @@
 """The bayesian component."""
+
+DOMAIN = "bayesian"
+PLATFORMS = ["binary_sensor"]
diff --git a/homeassistant/components/bayesian/binary_sensor.py b/homeassistant/components/bayesian/binary_sensor.py
index 8d4dab62263..90540e456c5 100644
--- a/homeassistant/components/bayesian/binary_sensor.py
+++ b/homeassistant/components/bayesian/binary_sensor.py
@@ -25,8 +25,11 @@ from homeassistant.helpers.event import (
     async_track_state_change_event,
     async_track_template_result,
 )
+from homeassistant.helpers.reload import async_setup_reload_service
 from homeassistant.helpers.template import result_as_boolean
 
+from . import DOMAIN, PLATFORMS
+
 ATTR_OBSERVATIONS = "observations"
 ATTR_OCCURRED_OBSERVATION_ENTITIES = "occurred_observation_entities"
 ATTR_PROBABILITY = "probability"
@@ -106,6 +109,8 @@ def update_probability(prior, prob_given_true, prob_given_false):
 
 async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
     """Set up the Bayesian Binary sensor."""
+    await async_setup_reload_service(hass, DOMAIN, PLATFORMS)
+
     name = config[CONF_NAME]
     observations = config[CONF_OBSERVATIONS]
     prior = config[CONF_PRIOR]
diff --git a/homeassistant/components/bayesian/services.yaml b/homeassistant/components/bayesian/services.yaml
new file mode 100644
index 00000000000..ec7313a8630
--- /dev/null
+++ b/homeassistant/components/bayesian/services.yaml
@@ -0,0 +1,2 @@
+reload:
+  description: Reload all bayesian entities.
diff --git a/tests/components/bayesian/test_binary_sensor.py b/tests/components/bayesian/test_binary_sensor.py
index 9e4983ab4d5..57c7f404c7f 100644
--- a/tests/components/bayesian/test_binary_sensor.py
+++ b/tests/components/bayesian/test_binary_sensor.py
@@ -1,15 +1,18 @@
 """The test for the bayesian sensor platform."""
 import json
+from os import path
 import unittest
 
-from homeassistant.components.bayesian import binary_sensor as bayesian
+from homeassistant import config as hass_config
+from homeassistant.components.bayesian import DOMAIN, binary_sensor as bayesian
 from homeassistant.components.homeassistant import (
     DOMAIN as HA_DOMAIN,
     SERVICE_UPDATE_ENTITY,
 )
-from homeassistant.const import ATTR_ENTITY_ID, STATE_UNKNOWN
+from homeassistant.const import ATTR_ENTITY_ID, SERVICE_RELOAD, STATE_UNKNOWN
 from homeassistant.setup import async_setup_component, setup_component
 
+from tests.async_mock import patch
 from tests.common import get_test_home_assistant
 
 
@@ -631,3 +634,55 @@ async def test_monitored_sensor_goes_away(hass):
 
     await hass.async_block_till_done()
     assert hass.states.get("binary_sensor.test_binary").state == "on"
+
+
+async def test_reload(hass):
+    """Verify we can reload bayesian sensors."""
+
+    config = {
+        "binary_sensor": {
+            "name": "test",
+            "platform": "bayesian",
+            "observations": [
+                {
+                    "platform": "state",
+                    "entity_id": "sensor.test_monitored",
+                    "to_state": "on",
+                    "prob_given_true": 0.9,
+                    "prob_given_false": 0.4,
+                },
+            ],
+            "prior": 0.2,
+            "probability_threshold": 0.32,
+        }
+    }
+
+    await async_setup_component(hass, "binary_sensor", config)
+    await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 1
+
+    assert hass.states.get("binary_sensor.test")
+
+    yaml_path = path.join(
+        _get_fixtures_base_path(),
+        "fixtures",
+        "bayesian/configuration.yaml",
+    )
+    with patch.object(hass_config, "YAML_CONFIG_FILE", yaml_path):
+        await hass.services.async_call(
+            DOMAIN,
+            SERVICE_RELOAD,
+            {},
+            blocking=True,
+        )
+        await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 1
+
+    assert hass.states.get("binary_sensor.test") is None
+    assert hass.states.get("binary_sensor.test2")
+
+
+def _get_fixtures_base_path():
+    return path.dirname(path.dirname(path.dirname(__file__)))
diff --git a/tests/fixtures/bayesian/configuration.yaml b/tests/fixtures/bayesian/configuration.yaml
new file mode 100644
index 00000000000..56a490d4aec
--- /dev/null
+++ b/tests/fixtures/bayesian/configuration.yaml
@@ -0,0 +1,10 @@
+binary_sensor:
+  - platform: bayesian
+    prior: 0.1
+    observations:
+      - entity_id: 'switch.kitchen_lights'
+        prob_given_true: 0.6
+        prob_given_false: 0.2
+        platform: 'state'
+        to_state: 'on'
+    name: test2