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+SEN0321 DFRobot Ozone Sensor
+============================
+
+.. seo::
+    :description: Instructions for setting up SEN0321 DFRobot ozone sensors
+    :image: sen0321.jpg
+    :keywords: sen0321
+
+The ``sen0321`` sensor platform allows you to use your DFRobot
+(`product wiki <https://wiki.dfrobot.com/Gravity_IIC_Ozone_Sensor_(0-10ppm)%20SKU_SEN0321>`__,
+`DFRobot`_) ozone sensors with ESPHome. The sensor is used in automatic mode where the sensor actively
+updates its measurements every 2 seconds.
+:ref:`I²C <i2c>` is required to be set up in your configuration for this sensor to work.
+
+.. figure:: images/sen0321.jpg
+    :align: center
+    :width: 50.0%
+
+    DFRobot Ozone Sensor (sen0321).
+
+.. _DFRobot: https://www.dfrobot.com/product-2005.html
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    sensor:
+      - platform: sen0321
+        name: "Ozone Sensor"
+        address: 0x73
+        update_interval: 60s
+
+Configuration variables:
+------------------------
+
+- All options from :ref:`Sensor <config-sensor>`.
+
+- **address** (*Optional*, int): Manually specify the I²C address of
+  the sensor. Defaults to ``0x73``. Sensor can be configured to ``0x70``, ``0x71``, ``0x72``, or ``0x73`` using jumpers on the board.
+
+- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
+  sensor. Defaults to ``60s``.
+
+See Also
+--------
+
+- :ref:`sensor-filters`
+- :apiref:`sen0321/sen0321.h`
+- `DFRobot SEN0321 Library <https://github.com/DFRobot/DFRobot_OzoneSensor/>`__ by `DFRobot <https://www.dfrobot.com/>`__
+- :ghedit:`Edit`
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diff --git a/index.rst b/index.rst
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--- a/index.rst
+++ b/index.rst
@@ -185,6 +185,7 @@ Air Quality
     PMSX003, components/sensor/pmsx003, pmsx003.svg, Particulate
     RadonEye BLE, components/sensor/radon_eye_ble, radon_eye_logo.png, Radon
     SDS011 Sensor, components/sensor/sds011, sds011.jpg, Particulate
+    SEN0321, components/sensor/sen0321, sen0321.jpg, Ozone
     SEN5x, components/sensor/sen5x, sen54.jpg, Temperature & Humidity, Volatile organics and NOx
     SenseAir, components/sensor/senseair, senseair_s8.jpg, CO2
     SCD30, components/sensor/scd30, scd30.jpg, CO2 & Temperature & Humidity