diff --git a/auth/src/commonMain/kotlin/com/quran/shared/auth/di/AuthModule.kt b/auth/src/commonMain/kotlin/com/quran/shared/auth/di/AuthModule.kt
index 54b42b2d..5d2ef3da 100644
--- a/auth/src/commonMain/kotlin/com/quran/shared/auth/di/AuthModule.kt
+++ b/auth/src/commonMain/kotlin/com/quran/shared/auth/di/AuthModule.kt
@@ -7,6 +7,7 @@ import com.quran.shared.auth.repository.AuthRepository
 import com.quran.shared.auth.repository.AuthNetworkDataSource
 import com.quran.shared.auth.repository.OidcAuthRepository
 import com.quran.shared.auth.repository.UnconfiguredAuthRepository
+import com.quran.shared.auth.utils.redactSensitiveAuthData
 import com.quran.shared.di.AppScope
 import dev.zacsweers.metro.BindingContainer
 import dev.zacsweers.metro.ContributesTo
@@ -17,6 +18,7 @@ import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.client.plugins.logging.LogLevel
 import io.ktor.client.plugins.logging.Logger
 import io.ktor.client.plugins.logging.Logging
+import io.ktor.http.HttpHeaders
 import io.ktor.serialization.kotlinx.json.json
 import kotlin.native.HiddenFromObjC
 import kotlinx.serialization.json.Json
@@ -70,9 +72,17 @@ abstract class AuthModule {
             return HttpClient {
                 install(Logging) {
                     logger = object : Logger {
-                        override fun log(message: String) = println("HTTP Client: $message")
+                        override fun log(message: String) {
+                            println("HTTP Client: ${redactSensitiveAuthData(message)}")
+                        }
                     }
                     level = if (config.environment.enableVerboseLogging) LogLevel.ALL else LogLevel.NONE
+                    sanitizeHeader { header ->
+                        header.equals(HttpHeaders.Authorization, ignoreCase = true) ||
+                            header.equals(HttpHeaders.Cookie, ignoreCase = true) ||
+                            header.equals(HttpHeaders.SetCookie, ignoreCase = true) ||
+                            header.equals("x-auth-token", ignoreCase = true)
+                    }
                 }
                 install(ContentNegotiation) {
                     json(json)
diff --git a/auth/src/commonMain/kotlin/com/quran/shared/auth/utils/AuthLogSanitizer.kt b/auth/src/commonMain/kotlin/com/quran/shared/auth/utils/AuthLogSanitizer.kt
new file mode 100644
index 00000000..48ac6c76
--- /dev/null
+++ b/auth/src/commonMain/kotlin/com/quran/shared/auth/utils/AuthLogSanitizer.kt
@@ -0,0 +1,23 @@
+package com.quran.shared.auth.utils
+
+private val sensitiveHeaderPattern = Regex(
+    pattern = """(?im)^(\s*(?:->\s*)?(?:Authorization|Cookie|Set-Cookie|x-auth-token):)\s*.*$"""
+)
+private val sensitiveJsonFieldPattern = Regex(
+    pattern = """(?i)("(?:access_token|id_token|refresh_token)"\s*:\s*")[^"]*(")"""
+)
+private val sensitiveFormFieldPattern = Regex(
+    pattern = """(?i)(^|[&\n])((?:token|code|code_verifier)=)[^&\r\n]*"""
+)
+
+internal fun redactSensitiveAuthData(message: String): String {
+    val redactedHeaders = sensitiveHeaderPattern.replace(message) {
+        "${it.groupValues[1]} ***"
+    }
+    val redactedJson = sensitiveJsonFieldPattern.replace(redactedHeaders) {
+        "${it.groupValues[1]}***${it.groupValues[2]}"
+    }
+    return sensitiveFormFieldPattern.replace(redactedJson) {
+        "${it.groupValues[1]}${it.groupValues[2]}***"
+    }
+}
diff --git a/auth/src/commonTest/kotlin/com/quran/shared/auth/utils/AuthLogSanitizerTest.kt b/auth/src/commonTest/kotlin/com/quran/shared/auth/utils/AuthLogSanitizerTest.kt
new file mode 100644
index 00000000..29c079f3
--- /dev/null
+++ b/auth/src/commonTest/kotlin/com/quran/shared/auth/utils/AuthLogSanitizerTest.kt
@@ -0,0 +1,28 @@
+package com.quran.shared.auth.utils
+
+import kotlin.test.Test
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class AuthLogSanitizerTest {
+
+    @Test
+    fun redactsSensitiveHeadersAndBodyFields() {
+        val sensitiveValue = "sensitive-value"
+        val message = """
+            -> Authorization: Bearer $sensitiveValue
+            -> x-auth-token: $sensitiveValue
+            BODY START
+            token=$sensitiveValue&code=$sensitiveValue&code_verifier=$sensitiveValue
+            {"access_token":"$sensitiveValue","id_token":"$sensitiveValue","refresh_token":"$sensitiveValue"}
+            BODY END
+        """.trimIndent()
+
+        val result = redactSensitiveAuthData(message)
+
+        assertFalse(result.contains(sensitiveValue))
+        assertTrue(result.contains("-> Authorization: ***"))
+        assertTrue(result.contains("token=***&code=***&code_verifier=***"))
+        assertTrue(result.contains(""""access_token":"***""""))
+    }
+}
diff --git a/syncengine/src/iosMain/kotlin/com/quran/shared/syncengine/network/HttpClientFactory.apple.kt b/syncengine/src/iosMain/kotlin/com/quran/shared/syncengine/network/HttpClientFactory.apple.kt
index d2d84fca..ba649f46 100644
--- a/syncengine/src/iosMain/kotlin/com/quran/shared/syncengine/network/HttpClientFactory.apple.kt
+++ b/syncengine/src/iosMain/kotlin/com/quran/shared/syncengine/network/HttpClientFactory.apple.kt
@@ -4,9 +4,14 @@ import io.ktor.client.HttpClient
 import io.ktor.client.engine.darwin.Darwin
 import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.client.plugins.logging.LogLevel
+import io.ktor.client.plugins.logging.Logger as KtorLogger
 import io.ktor.client.plugins.logging.Logging
+import io.ktor.http.HttpHeaders
 import kotlinx.serialization.json.Json
 import io.ktor.serialization.kotlinx.json.json
+import platform.Foundation.NSProcessInfo
+
+private const val HTTP_LOG_LEVEL_ENVIRONMENT_KEY = "MOBILE_SYNC_HTTP_LOG_LEVEL"
 
 actual object HttpClientFactory {
     actual fun createHttpClient(): HttpClient {
@@ -15,8 +20,30 @@ actual object HttpClientFactory {
                 json(Json { explicitNulls = false })
             }
             install(Logging) {
-                level = LogLevel.INFO
+                logger = object : KtorLogger {
+                    override fun log(message: String) {
+                        println("KtorHTTP: $message")
+                    }
+                }
+                level = configuredHttpLogLevel()
+                sanitizeHeader { header ->
+                    header.equals(HttpHeaders.Authorization, ignoreCase = true) ||
+                        header.equals(HttpHeaders.Cookie, ignoreCase = true) ||
+                        header.equals(HttpHeaders.SetCookie, ignoreCase = true) ||
+                        header.equals("x-auth-token", ignoreCase = true)
+                }
             }
         }
     }
-} 
+}
+
+private fun configuredHttpLogLevel(): LogLevel {
+    val configuredLevel = NSProcessInfo.processInfo.environment[HTTP_LOG_LEVEL_ENVIRONMENT_KEY] as? String
+    return when (configuredLevel?.uppercase()) {
+        "ALL" -> LogLevel.ALL
+        "BODY" -> LogLevel.BODY
+        "HEADERS" -> LogLevel.HEADERS
+        "NONE" -> LogLevel.NONE
+        else -> LogLevel.INFO
+    }
+}