diff --git a/esphome/components/esp32_ble_server/__init__.py b/esphome/components/esp32_ble_server/__init__.py
index d9884a3dd8..7c2bce0f44 100644
--- a/esphome/components/esp32_ble_server/__init__.py
+++ b/esphome/components/esp32_ble_server/__init__.py
@@ -27,7 +27,7 @@ CONF_BROADCAST = "broadcast"
 CONF_CHARACTERISTICS = "characteristics"
 CONF_DESCRIPTION = "description"
 CONF_DESCRIPTORS = "descriptors"
-CONF_ENDIANNES = "endianness"
+CONF_ENDIANNESS = "endianness"
 CONF_INDICATE = "indicate"
 CONF_MANUFACTURER = "manufacturer"
 CONF_MANUFACTURER_DATA = "manufacturer_data"
@@ -218,7 +218,7 @@ VALUE_SCHEMA = cv.Schema(
                 ]
             )  # Common encodings
         ),
-        cv.Optional(CONF_ENDIANNES, default="LITTLE"): cv.enum(
+        cv.Optional(CONF_ENDIANNESS, default="LITTLE"): cv.enum(
             {
                 "LITTLE": Endianness_ns.LITTLE,
                 "BIG": Endianness_ns.BIG,
@@ -325,7 +325,7 @@ async def parse_value(value_config, args):
         value, value_config[CONF_TYPE], value_config[CONF_STRING_ENCODING]
     )
     buffer_var = cg.variable(
-        buffer_id, ByteBuffer_ns.wrap(val, value_config[CONF_ENDIANNES])
+        buffer_id, ByteBuffer_ns.wrap(val, value_config[CONF_ENDIANNESS])
     )
     return buffer_var
 
diff --git a/tests/components/esp32_ble_server/common.yaml b/tests/components/esp32_ble_server/common.yaml
index 3ef6c27204..dcd59d2b02 100644
--- a/tests/components/esp32_ble_server/common.yaml
+++ b/tests/components/esp32_ble_server/common.yaml
@@ -60,4 +60,4 @@ esp32_ble_server:
                   value:
                     value: !lambda 'return bytebuffer::ByteBuffer::wrap({0x00, 0x01, 0x02}).get_data();'
               - ble_server.characteristic.notify:
-                  id: test_notify_characteristic
\ No newline at end of file
+                  id: test_notify_characteristic