diff --git a/esphome/components/logger/logger.h b/esphome/components/logger/logger.h
index 8abc1196e18..36195b919a7 100644
--- a/esphome/components/logger/logger.h
+++ b/esphome/components/logger/logger.h
@@ -118,11 +118,11 @@ static constexpr uint16_t MAX_HEADER_SIZE = 128;
 static constexpr size_t MAX_POINTER_REPRESENTATION = 2 + sizeof(void *) * 2 + 1;
 
 // Platform-specific: does write_msg_ add its own newline?
-// false: Caller must add newline to buffer before calling write_msg_ (ESP32, ESP8266, LibreTiny)
+// false: Caller must add newline to buffer before calling write_msg_ (ESP32, ESP8266, RP2040, LibreTiny)
 //        Allows single write call with newline included for efficiency
 // true:  write_msg_ adds newline itself via puts()/println() (other platforms)
 //        Newline should NOT be added to buffer
-#if defined(USE_ESP32) || defined(USE_ESP8266) || defined(USE_LIBRETINY)
+#if defined(USE_ESP32) || defined(USE_ESP8266) || defined(USE_RP2040) || defined(USE_LIBRETINY)
 static constexpr bool WRITE_MSG_ADDS_NEWLINE = false;
 #else
 static constexpr bool WRITE_MSG_ADDS_NEWLINE = true;
diff --git a/esphome/components/logger/logger_rp2040.cpp b/esphome/components/logger/logger_rp2040.cpp
index 4a8535c8e40..be8252f56ab 100644
--- a/esphome/components/logger/logger_rp2040.cpp
+++ b/esphome/components/logger/logger_rp2040.cpp
@@ -27,7 +27,10 @@ void Logger::pre_setup() {
   ESP_LOGI(TAG, "Log initialized");
 }
 
-void HOT Logger::write_msg_(const char *msg, size_t) { this->hw_serial_->println(msg); }
+void HOT Logger::write_msg_(const char *msg, size_t len) {
+  // Single write with newline already in buffer (added by caller)
+  this->hw_serial_->write(msg, len);
+}
 
 const LogString *Logger::get_uart_selection_() {
   switch (this->uart_) {