diff --git a/Sources/HTTPMock/Internal/HTTPMockLog.swift b/Sources/HTTPMock/Internal/HTTPMockLog.swift
index adebbca..260ddc8 100644
--- a/Sources/HTTPMock/Internal/HTTPMockLog.swift
+++ b/Sources/HTTPMock/Internal/HTTPMockLog.swift
@@ -7,49 +7,54 @@ public enum HTTPMockLog {
     public static var level: Level = .trace
 
     public static func error(_ message: @autoclosure () -> String) {
-        if should(.error) {
+        let level = Level.error
+        if shouldLog(level) {
             let message = message()
             logger.error("[HTTPMock][\(level.description)] \(message, privacy: .public)")
-            printToConsole("⛔️ \(message)", level: .error)
+            printToConsole("⛔️ \(message)", level: level)
         }
     }
 
     public static func warning(_ message: @autoclosure () -> String) {
-        if should(.warning) {
+        let level = Level.warning
+        if shouldLog(level) {
             let message = message()
             logger.warning("[HTTPMock][\(level.description)] \(message, privacy: .public)")
-            printToConsole("⚠️ \(message)", level: .warning)
+            printToConsole("⚠️ \(message)", level: level)
         }
     }
 
     public static func info(_ message: @autoclosure () -> String) {
-        if should(.info) {
+        let level = Level.info
+        if shouldLog(level) {
             let message = message()
             logger.info("[HTTPMock][\(level.description)] \(message, privacy: .public)")
-            printToConsole(message, level: .info)
+            printToConsole(message, level: level)
         }
     }
 
     public static func debug(_ message: @autoclosure () -> String) {
-        if should(.debug) {
+        let level = Level.debug
+        if shouldLog(level) {
             let message = message()
             logger.debug("[HTTPMock][\(level.description)] \(message, privacy: .public)")
-            printToConsole(message, level: .debug)
+            printToConsole(message, level: level)
         }
     }
 
     public static func trace(_ message: @autoclosure () -> String) {
-        if should(.trace) {
+        let level = Level.trace
+        if shouldLog(level) {
             let message = message()
             logger.log("[HTTPMock][\(level.description)] \(message, privacy: .public)")
-            printToConsole(message, level: .trace)
+            printToConsole(message, level: level)
         }
     }
 
     // MARK: - Private methods
 
     @inline(__always)
-    private static func should(_ l: Level) -> Bool {
+    private static func shouldLog(_ l: Level) -> Bool {
         isEnabled && l.rawValue <= level.rawValue
     }
 
diff --git a/Sources/HTTPMock/Internal/HTTPMockURLProtocol.swift b/Sources/HTTPMock/Internal/HTTPMockURLProtocol.swift
index f807ce7..9fc6632 100644
--- a/Sources/HTTPMock/Internal/HTTPMockURLProtocol.swift
+++ b/Sources/HTTPMock/Internal/HTTPMockURLProtocol.swift
@@ -230,6 +230,11 @@ final class HTTPMockURLProtocol: URLProtocol {
                 }
                 task.resume()
 
+            case .throwError(let errorToThrow):
+                HTTPMockLog.info("No mock found for incoming request '\(requestDescription)' — throwing provided error")
+
+                client?.urlProtocol(self, didFailWithError: errorToThrow as NSError)
+
             case .fatalError:
                 HTTPMockLog.info("No mock found for incoming request '\(requestDescription)' — performing a fatalError")
 
diff --git a/Sources/HTTPMock/Models/UnmockedPolicy.swift b/Sources/HTTPMock/Models/UnmockedPolicy.swift
index a0a7c84..c5d603f 100644
--- a/Sources/HTTPMock/Models/UnmockedPolicy.swift
+++ b/Sources/HTTPMock/Models/UnmockedPolicy.swift
@@ -11,7 +11,10 @@ public enum UnmockedPolicy {
     /// Let the request pass through to the internet.
     /// Useful for integration tests where you want to mock some responses, but let others hit actual network.
     case passthrough
-    
+
+    /// Throw the specified error when an unmocked request is encountered.
+    case throwError(Error)
+
     /// Perform a `fatalError()` call to abruptly end the running app/test.
     /// Useful for strict testing of your networking.
     case fatalError
diff --git a/Tests/HTTPMockTests/HTTPMockTests.swift b/Tests/HTTPMockTests/HTTPMockTests.swift
index c237789..0a2a8c5 100644
--- a/Tests/HTTPMockTests/HTTPMockTests.swift
+++ b/Tests/HTTPMockTests/HTTPMockTests.swift
@@ -147,6 +147,20 @@ struct HTTPMockTests {
         #expect(data3.toString == "Different mock")
     }
 
+    @Test
+    func unmockedPolicy_throwError() async throws {
+        let url = try #require(URL(string: "https://example.com/throw-error"))
+        
+        httpMock.unmockedPolicy = .throwError(UnmockedError.wasThrown)
+
+        do {
+            _ = try await httpMock.urlSession.data(from: url)
+            Issue.record("Expected error not thrown")
+        } catch {
+            #expect((error as NSError).domain == UnmockedError.errorDomain)
+        }
+    }
+
     @Test
     func itDoesNotRegisterTheKeyIfNoResponsesAreProvided() {
         let key = makeKey()
@@ -664,3 +678,10 @@ struct HTTPMockTests {
         )
     }
 }
+
+private enum UnmockedError: Int, Error, CustomNSError {
+    case wasThrown = 666
+
+    static var errorDomain: String { "HTTPMock.UnmockedError" }
+    var errorCode: Int { rawValue }
+}