diff --git a/esphome/components/api/api.proto b/esphome/components/api/api.proto
index 684540ffa6..6fd6f05c45 100644
--- a/esphome/components/api/api.proto
+++ b/esphome/components/api/api.proto
@@ -213,6 +213,7 @@ message DeviceInfoResponse {
   // The esphome project details if set
   string project_name = 8;
   string project_version = 9;
+  string project_manufacturer = 18;
 
   uint32 webserver_port = 10;
 
diff --git a/esphome/components/api/api_connection.cpp b/esphome/components/api/api_connection.cpp
index bb55a2ccf6..6e979e20cc 100644
--- a/esphome/components/api/api_connection.cpp
+++ b/esphome/components/api/api_connection.cpp
@@ -1479,7 +1479,13 @@ DeviceInfoResponse APIConnection::device_info(const DeviceInfoRequest &msg) {
   resp.has_deep_sleep = deep_sleep::global_has_deep_sleep;
 #endif
 #ifdef ESPHOME_PROJECT_NAME
-  resp.project_name = ESPHOME_PROJECT_NAME;
+  if (this->client_api_version_major_ > 1 ||
+      (this->client_api_version_major_ == 1 && this->client_api_version_minor_ >= 11)) {
+    resp.project_name = ESPHOME_PROJECT_NAME;
+    resp.project_manufacturer = ESPHOME_PROJECT_MANUFACTURER;
+  } else {
+    resp.project_name = ESPHOME_PROJECT_MANUFACTURER "." ESPHOME_PROJECT_NAME;
+  }
   resp.project_version = ESPHOME_PROJECT_VERSION;
 #endif
 #ifdef USE_WEBSERVER
diff --git a/esphome/components/api/api_pb2.cpp b/esphome/components/api/api_pb2.cpp
index 8df152881c..e058b9c2b3 100644
--- a/esphome/components/api/api_pb2.cpp
+++ b/esphome/components/api/api_pb2.cpp
@@ -826,6 +826,10 @@ bool DeviceInfoResponse::decode_length(uint32_t field_id, ProtoLengthDelimited v
       this->project_version = value.as_string();
       return true;
     }
+    case 18: {
+      this->project_manufacturer = value.as_string();
+      return true;
+    }
     case 12: {
       this->manufacturer = value.as_string();
       return true;
@@ -852,6 +856,7 @@ void DeviceInfoResponse::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_bool(7, this->has_deep_sleep);
   buffer.encode_string(8, this->project_name);
   buffer.encode_string(9, this->project_version);
+  buffer.encode_string(18, this->project_manufacturer);
   buffer.encode_uint32(10, this->webserver_port);
   buffer.encode_uint32(11, this->legacy_bluetooth_proxy_version);
   buffer.encode_uint32(15, this->bluetooth_proxy_feature_flags);
@@ -901,6 +906,10 @@ void DeviceInfoResponse::dump_to(std::string &out) const {
   out.append("'").append(this->project_version).append("'");
   out.append("\n");
 
+  out.append("  project_manufacturer: ");
+  out.append("'").append(this->project_manufacturer).append("'");
+  out.append("\n");
+
   out.append("  webserver_port: ");
   sprintf(buffer, "%" PRIu32, this->webserver_port);
   out.append(buffer);
diff --git a/esphome/components/api/api_pb2.h b/esphome/components/api/api_pb2.h
index 063c217bf7..97e9d2a0d6 100644
--- a/esphome/components/api/api_pb2.h
+++ b/esphome/components/api/api_pb2.h
@@ -346,6 +346,7 @@ class DeviceInfoResponse : public ProtoMessage {
   bool has_deep_sleep{false};
   std::string project_name{};
   std::string project_version{};
+  std::string project_manufacturer{};
   uint32_t webserver_port{0};
   uint32_t legacy_bluetooth_proxy_version{0};
   uint32_t bluetooth_proxy_feature_flags{0};
diff --git a/esphome/const.py b/esphome/const.py
index 3d3bfcc244..7bc118ddd6 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -463,6 +463,7 @@ CONF_MAGNITUDE = "magnitude"
 CONF_MAINS_FILTER = "mains_filter"
 CONF_MAKE_ID = "make_id"
 CONF_MANUAL_IP = "manual_ip"
+CONF_MANUFACTURER = "manufacturer"
 CONF_MANUFACTURER_ID = "manufacturer_id"
 CONF_MASK_DISTURBER = "mask_disturber"
 CONF_MAX_BRIGHTNESS = "max_brightness"
diff --git a/esphome/core/config.py b/esphome/core/config.py
index eee8b73934..a4214dd597 100644
--- a/esphome/core/config.py
+++ b/esphome/core/config.py
@@ -19,6 +19,7 @@ from esphome.const import (
     CONF_FRIENDLY_NAME,
     CONF_INCLUDES,
     CONF_LIBRARIES,
+    CONF_MANUFACTURER,
     CONF_MIN_VERSION,
     CONF_NAME,
     CONF_NAME_ADD_MAC_SUFFIX,
@@ -96,10 +97,33 @@ def valid_include(value):
     return value
 
 
-def valid_project_name(value: str):
-    if value.count(".") != 1:
-        raise cv.Invalid("project name needs to have a namespace")
-    return value
+def _validate_project_info(config):
+    name = config[CONF_NAME]
+    dot_count = name.count(".")
+    if CONF_MANUFACTURER not in config:
+        if dot_count != 1:
+            raise cv.Invalid(
+                f"'{CONF_MANUFACTURER}' is a required option for [{CONF_PROJECT}]"
+            )
+        author, name = name.split(".", 1)
+        config[CONF_MANUFACTURER] = author
+        config[CONF_NAME] = name
+        _LOGGER.warning(
+            "Prefixing %s %s with %s namespace is deprecated and will be disallowed in a future release. "
+            "Please see current documentation for the correct way to define the %s information.",
+            CONF_PROJECT,
+            CONF_NAME,
+            CONF_MANUFACTURER,
+            CONF_PROJECT,
+        )
+    elif dot_count != 0:
+        author, name = name.split(".", 1)
+        raise cv.Invalid(
+            f"Remove {CONF_MANUFACTURER} namespace '{author}.' from the {CONF_PROJECT} {CONF_NAME}",
+            path=[CONF_NAME],
+        )
+
+    return config
 
 
 if "ESPHOME_DEFAULT_COMPILE_PROCESS_LIMIT" in os.environ:
@@ -110,7 +134,6 @@ if "ESPHOME_DEFAULT_COMPILE_PROCESS_LIMIT" in os.environ:
 else:
     _compile_process_limit_default = cv.UNDEFINED
 
-
 CONF_ESP8266_RESTORE_FROM_FLASH = "esp8266_restore_from_flash"
 CONFIG_SCHEMA = cv.All(
     cv.Schema(
@@ -145,20 +168,22 @@ CONFIG_SCHEMA = cv.All(
             cv.Optional(CONF_INCLUDES, default=[]): cv.ensure_list(valid_include),
             cv.Optional(CONF_LIBRARIES, default=[]): cv.ensure_list(cv.string_strict),
             cv.Optional(CONF_NAME_ADD_MAC_SUFFIX, default=False): cv.boolean,
-            cv.Optional(CONF_PROJECT): cv.Schema(
-                {
-                    cv.Required(CONF_NAME): cv.All(
-                        cv.string_strict, valid_project_name
-                    ),
-                    cv.Required(CONF_VERSION): cv.string_strict,
-                    cv.Optional(CONF_ON_UPDATE): automation.validate_automation(
-                        {
-                            cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(
-                                ProjectUpdateTrigger
-                            ),
-                        }
-                    ),
-                }
+            cv.Optional(CONF_PROJECT): cv.All(
+                cv.Schema(
+                    {
+                        cv.Optional(CONF_MANUFACTURER): cv.string_strict,
+                        cv.Required(CONF_NAME): cv.string_strict,
+                        cv.Required(CONF_VERSION): cv.string_strict,
+                        cv.Optional(CONF_ON_UPDATE): automation.validate_automation(
+                            {
+                                cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(
+                                    ProjectUpdateTrigger
+                                ),
+                            }
+                        ),
+                    }
+                ),
+                _validate_project_info,
             ),
             cv.Optional(CONF_MIN_VERSION, default=ESPHOME_VERSION): cv.All(
                 cv.version_number, cv.validate_esphome_version
@@ -394,6 +419,7 @@ async def to_code(config):
 
     if project_conf := config.get(CONF_PROJECT):
         cg.add_define("ESPHOME_PROJECT_NAME", project_conf[CONF_NAME])
+        cg.add_define("ESPHOME_PROJECT_AUTHOR", project_conf[CONF_MANUFACTURER])
         cg.add_define("ESPHOME_PROJECT_VERSION", project_conf[CONF_VERSION])
         cg.add_define("ESPHOME_PROJECT_VERSION_30", project_conf[CONF_VERSION][:29])
         for conf in project_conf.get(CONF_ON_UPDATE, []):
diff --git a/esphome/core/defines.h b/esphome/core/defines.h
index eb3b20d007..34bdec338b 100644
--- a/esphome/core/defines.h
+++ b/esphome/core/defines.h
@@ -10,6 +10,7 @@
 // Informative flags
 #define ESPHOME_BOARD "dummy_board"
 #define ESPHOME_PROJECT_NAME "dummy project"
+#define ESPHOME_PROJECT_MANUFACTURER "ESPHome"
 #define ESPHOME_PROJECT_VERSION "v2"
 #define ESPHOME_PROJECT_VERSION_30 "v2"
 #define ESPHOME_VARIANT "ESP32"