diff --git a/src/main/java/me/gg/pinit/infrastructure/logging/DiscordWebhookAppender.java b/src/main/java/me/gg/pinit/infrastructure/logging/DiscordWebhookAppender.java
new file mode 100644
index 0000000..af2ae4b
--- /dev/null
+++ b/src/main/java/me/gg/pinit/infrastructure/logging/DiscordWebhookAppender.java
@@ -0,0 +1,134 @@
+package me.gg.pinit.infrastructure.logging;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.classic.spi.ThrowableProxyUtil;
+import ch.qos.logback.core.AppenderBase;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.Setter;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+
+public class DiscordWebhookAppender extends AppenderBase<ILoggingEvent> {
+
+    // logback-spring.xml 에서 주입
+    @Setter
+    private String webhookUrl;
+    @Setter
+    private String username = "pinit-auth-log";
+
+    // Discord content 제한 (2000자)
+    @Setter
+    private int maxContentLength = 1900;
+
+    @Setter
+    private int connectTimeoutMillis = 2000;
+    @Setter
+    private int requestTimeoutMillis = 3000;
+
+    private HttpClient client;
+    private final ObjectMapper om = new ObjectMapper();
+
+    @Override
+    public void start() {
+        if (this.webhookUrl == null || this.webhookUrl.isEmpty()) {
+            addWarn("디스코드 웹훅 URL이 설정되지 않았습니다. DiscordWebhookAppender가 시작되지 않습니다.");
+            return;
+        }
+        client = HttpClient.newBuilder()
+                .connectTimeout(Duration.ofMillis(connectTimeoutMillis))
+                .build();
+
+        super.start();
+    }
+
+    @Override
+    protected void append(ILoggingEvent event) {
+        if (!isStarted()) return;
+
+        try {
+            String content = format(event);
+            content = truncate(content, maxContentLength);
+
+            Map<String, Object> payload = Map.of(
+                    "username", username,
+                    "content", content,
+                    "allowed_mentions", Map.of("parse", List.of())
+            );
+
+            String json = om.writeValueAsString(payload);
+
+            HttpRequest req = HttpRequest.newBuilder()
+                    .uri(URI.create(webhookUrl))
+                    .timeout(Duration.ofMillis(requestTimeoutMillis))
+                    .header("Content-Type", "application/json")
+                    .POST(HttpRequest.BodyPublishers.ofString(json))
+                    .build();
+
+            HttpResponse<String> resp = client.send(req, HttpResponse.BodyHandlers.ofString());
+
+            if (resp.statusCode() == 429) {
+                long waitMs = parseRetryAfterMillis(resp);
+                if (waitMs > 0)
+                    Thread.sleep(waitMs);
+
+                HttpResponse<String> retry = client.send(req, HttpResponse.BodyHandlers.ofString());
+                if (retry.statusCode() >= 200 && retry.statusCode() < 300) {
+                    return; // 성공
+                }
+                addWarn("DiscordWebhookAppender: 재시도 후에도 실패, 상태 코드: " + retry.statusCode());
+                return;
+            }
+            if (resp.statusCode() < 200 || resp.statusCode() >= 300) {
+                addWarn("DiscordWebhookAppender: HTTP 요청 실패, 상태 코드: " + resp.statusCode());
+            }
+        } catch (JsonProcessingException e) {
+            addWarn("DiscordWebhookAppender: JSON 직렬화 실패", e);
+        } catch (IOException e) {
+            addWarn("DiscordWebhookAppender: HTTP 요청 실패", e);
+        } catch (InterruptedException e) {
+            addWarn("DiscordWebhookAppender: HTTP 요청이 중단됨", e);
+        }
+    }
+
+    private String format(ILoggingEvent event) {
+        String base = String.format(
+                "[%s] %-5s %s - %s",
+                java.time.Instant.ofEpochMilli(event.getTimeStamp()),
+                event.getLevel(),
+                event.getLoggerName(),
+                event.getFormattedMessage()
+        );
+
+        if (event.getThrowableProxy() != null) {
+            String stack = ThrowableProxyUtil.asString(event.getThrowableProxy());
+            return base + "\n```" + stack + "```";
+        }
+        return base;
+    }
+
+    private String truncate(String s, int max) {
+        if (s == null) return "";
+        if (s.length() <= max) return s;
+        return s.substring(0, max) + "\n...(truncated)";
+    }
+
+    private long parseRetryAfterMillis(HttpResponse<String> resp) {
+        String ra = resp.headers().firstValue("Retry-After").orElse(null);
+        if (ra == null || ra.isBlank()) return 0;
+
+        try {
+            double v = Double.parseDouble(ra.trim());
+            return (long) (v * 1000);
+        } catch (NumberFormatException ignore) {
+            return 0;
+        }
+    }
+}
diff --git a/src/main/resources/logback-spring.xml b/src/main/resources/logback-spring.xml
new file mode 100644
index 0000000..38856de
--- /dev/null
+++ b/src/main/resources/logback-spring.xml
@@ -0,0 +1,36 @@
+<configuration>
+
+    <property name="DISCORD_WEBHOOK_URL" value="${DISCORD_WEBHOOK_URL:-}"/>
+
+    <!-- 콘솔 appender -->
+    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %-5level [%X{traceId:-}] %logger{36} - %msg%n%ex{full}</pattern>
+        </encoder>
+    </appender>
+
+    <!-- Discord appender -->
+    <appender name="DISCORD" class="me.gg.pinit.infrastructure.logging.DiscordWebhookAppender">
+        <webhookUrl>${DISCORD_WEBHOOK_URL}</webhookUrl>
+        <username>backend-log</username>
+        <layout class="ch.qos.logback.classic.PatternLayout">
+            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %-5level [%X{traceId:-}] %logger{36} - %msg%n```%ex{full}```
+            </pattern>
+        </layout>
+
+        <!-- 최종 전송 지점에 필터 -->
+        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
+            <level>ERROR</level>
+        </filter>
+    </appender>
+
+    <appender name="ASYNC_DISCORD" class="ch.qos.logback.classic.AsyncAppender">
+        <appender-ref ref="DISCORD"/>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="CONSOLE"/>
+        <appender-ref ref="ASYNC_DISCORD"/>
+    </root>
+
+</configuration>
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