diff --git a/src/os/macosx/string_osx.cpp b/src/os/macosx/string_osx.cpp
new file mode 100644
--- /dev/null
+++ b/src/os/macosx/string_osx.cpp
@@ -0,0 +1,66 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file string_osx.cpp Functions related to localized text support on OSX. */
+
+#include "../../stdafx.h"
+#include "string_osx.h"
+#include "macos.h"
+
+#include <CoreFoundation/CoreFoundation.h>
+
+
+#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
+static CFLocaleRef _osx_locale = NULL;
+
+/** Store current language locale as a CoreFounation locale. */
+void MacOSSetCurrentLocaleName(const char *iso_code)
+{
+	if (!MacOSVersionIsAtLeast(10, 5, 0)) return;
+
+	if (_osx_locale != NULL) CFRelease(_osx_locale);
+
+	CFStringRef iso = CFStringCreateWithCString(kCFAllocatorNull, iso_code, kCFStringEncodingUTF8);
+	_osx_locale = CFLocaleCreate(kCFAllocatorDefault, iso);
+	CFRelease(iso);
+}
+
+/**
+ * Compares two strings using case insensitive natural sort.
+ *
+ * @param s1 First string to compare.
+ * @param s2 Second string to compare.
+ * @return 1 if s1 < s2, 2 if s1 == s2, 3 if s1 > s2, or 0 if not supported by the OS.
+ */
+int MacOSStringCompare(const char *s1, const char *s2)
+{
+	static bool supported = MacOSVersionIsAtLeast(10, 5, 0);
+	if (!supported) return 0;
+
+	CFStringCompareFlags flags = kCFCompareCaseInsensitive | kCFCompareNumerically | kCFCompareLocalized | kCFCompareWidthInsensitive | kCFCompareForcedOrdering;
+
+	CFStringRef cf1 = CFStringCreateWithCString(kCFAllocatorDefault, s1, kCFStringEncodingUTF8);
+	CFStringRef cf2 = CFStringCreateWithCString(kCFAllocatorDefault, s2, kCFStringEncodingUTF8);
+
+	CFComparisonResult res = CFStringCompareWithOptionsAndLocale(cf1, cf2, CFRangeMake(0, CFStringGetLength(cf1)), flags, _osx_locale);
+
+	CFRelease(cf1);
+	CFRelease(cf2);
+
+	return (int)res + 2;
+}
+
+#else
+void MacOSSetCurrentLocaleName(const char *iso_code) {}
+
+int MacOSStringCompare(const char *s1, const char *s2)
+{
+	return 0;
+}
+#endif /* (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5) */