diff --git a/Package.swift b/Package.swift
index 1fa3628..dc2732a 100644
--- a/Package.swift
+++ b/Package.swift
@@ -13,6 +13,7 @@ import PackageDescription
 
 let package = Package(
     name: "SpeziFoundation",
+    defaultLocalization: "en",
     platforms: [
         .iOS(.v17),
         .watchOS(.v10),
@@ -26,6 +27,9 @@ let package = Package(
     targets: [
         .target(
             name: "SpeziFoundation",
+            resources: [
+                .process("Resources")
+            ],
             swiftSettings: [
                 .enableExperimentalFeature("StrictConcurrency")
             ]
diff --git a/Sources/SpeziFoundation/Misc/TimeoutError.swift b/Sources/SpeziFoundation/Misc/TimeoutError.swift
index 3a5e708..0dedba6 100644
--- a/Sources/SpeziFoundation/Misc/TimeoutError.swift
+++ b/Sources/SpeziFoundation/Misc/TimeoutError.swift
@@ -16,7 +16,15 @@ public struct TimeoutError {
 }
 
 
-extension TimeoutError: Error {}
+extension TimeoutError: LocalizedError {
+    public var errorDescription: String? {
+        String(localized: LocalizedStringResource("Timeout", bundle: .atURL(Bundle.module.bundleURL)))
+    }
+
+    public var failureReason: String? {
+        String(localized: LocalizedStringResource("The operation timed out.", bundle: .atURL(Bundle.module.bundleURL)))
+    }
+}
 
 
 /// Race a timeout.
diff --git a/Sources/SpeziFoundation/Resources/Localizable.xcstrings b/Sources/SpeziFoundation/Resources/Localizable.xcstrings
new file mode 100644
index 0000000..6e95e2d
--- /dev/null
+++ b/Sources/SpeziFoundation/Resources/Localizable.xcstrings
@@ -0,0 +1,38 @@
+{
+  "sourceLanguage" : "en",
+  "strings" : {
+    "The operation timed out." : {
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Der Vorgang hat das Zeitlimit überschritten."
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "The operation timed out."
+          }
+        }
+      }
+    },
+    "Timeout" : {
+      "localizations" : {
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Zeitüberschreitung"
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Timeout"
+          }
+        }
+      }
+    }
+  },
+  "version" : "1.0"
+}
\ No newline at end of file
diff --git a/Sources/SpeziFoundation/Resources/Localizable.xcstrings.license b/Sources/SpeziFoundation/Resources/Localizable.xcstrings.license
new file mode 100644
index 0000000..a648e99
--- /dev/null
+++ b/Sources/SpeziFoundation/Resources/Localizable.xcstrings.license
@@ -0,0 +1,5 @@
+This source file is part of the Stanford Spezi open-source project
+
+SPDX-FileCopyrightText: 2024 Stanford University and the project authors (see CONTRIBUTORS.md)
+
+SPDX-License-Identifier: MIT