diff --git a/esphome/components/mqtt/mqtt_backend.h b/esphome/components/mqtt/mqtt_backend.h
index 3962c40a42..0c1720ec34 100644
--- a/esphome/components/mqtt/mqtt_backend.h
+++ b/esphome/components/mqtt/mqtt_backend.h
@@ -17,7 +17,8 @@ enum class MQTTClientDisconnectReason : int8_t {
   MQTT_MALFORMED_CREDENTIALS = 4,
   MQTT_NOT_AUTHORIZED = 5,
   ESP8266_NOT_ENOUGH_SPACE = 6,
-  TLS_BAD_FINGERPRINT = 7
+  TLS_BAD_FINGERPRINT = 7,
+  DNS_RESOLVE_ERROR = 8
 };
 
 /// internal struct for MQTT messages.
diff --git a/esphome/components/mqtt/mqtt_client.cpp b/esphome/components/mqtt/mqtt_client.cpp
index 3ba1ac6077..20e0b4a499 100644
--- a/esphome/components/mqtt/mqtt_client.cpp
+++ b/esphome/components/mqtt/mqtt_client.cpp
@@ -229,6 +229,8 @@ void MQTTClientComponent::check_dnslookup_() {
   if (this->dns_resolve_error_) {
     ESP_LOGW(TAG, "Couldn't resolve IP address for '%s'", this->credentials_.address.c_str());
     this->state_ = MQTT_CLIENT_DISCONNECTED;
+    this->disconnect_reason_ = MQTTClientDisconnectReason::DNS_RESOLVE_ERROR;
+    this->on_disconnect_.call(MQTTClientDisconnectReason::DNS_RESOLVE_ERROR);
     return;
   }
 
@@ -698,7 +700,9 @@ void MQTTClientComponent::set_on_connect(mqtt_on_connect_callback_t &&callback)
 }
 
 void MQTTClientComponent::set_on_disconnect(mqtt_on_disconnect_callback_t &&callback) {
+  auto callback_copy = callback;
   this->mqtt_backend_.set_on_disconnect(std::forward<mqtt_on_disconnect_callback_t>(callback));
+  this->on_disconnect_.add(std::move(callback_copy));
 }
 
 #if ASYNC_TCP_SSL_ENABLED
diff --git a/esphome/components/mqtt/mqtt_client.h b/esphome/components/mqtt/mqtt_client.h
index a95b122383..325ca56f4b 100644
--- a/esphome/components/mqtt/mqtt_client.h
+++ b/esphome/components/mqtt/mqtt_client.h
@@ -8,6 +8,7 @@
 #include "esphome/components/network/ip_address.h"
 #include "esphome/core/automation.h"
 #include "esphome/core/component.h"
+#include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
 #if defined(USE_ESP32)
 #include "mqtt_backend_esp32.h"
@@ -334,6 +335,7 @@ class MQTTClientComponent : public Component {
   uint32_t connect_begin_;
   uint32_t last_connected_{0};
   optional<MQTTClientDisconnectReason> disconnect_reason_{};
+  CallbackManager<MQTTBackend::on_disconnect_callback_t> on_disconnect_;
 
   bool publish_nan_as_none_{false};
   bool wait_for_connection_{false};