diff --git a/automation/include/aegisub/unicode.moon b/automation/include/aegisub/unicode.moon
index 8c1d210e5..672ff7a2a 100644
--- a/automation/include/aegisub/unicode.moon
+++ b/automation/include/aegisub/unicode.moon
@@ -28,6 +28,8 @@
 -- Unicode (UTF-8) support functions for Aegisub Automation 4 Lua
 -- http://www.ietf.org/rfc/rfc2279.txt
 
+impl = require 'aegisub.__unicode_impl'
+
 local unicode
 unicode =
   -- Return the number of bytes occupied by the character starting at the i'th byte in s
@@ -84,4 +86,8 @@ unicode =
       res = res*64 + s\byte(i) - 128
     res
 
+  to_upper_case: impl.to_upper_case
+  to_lower_case: impl.to_lower_case
+  to_fold_case: impl.to_fold_case
+
 return unicode
diff --git a/build/libaegisub/libaegisub.vcxproj b/build/libaegisub/libaegisub.vcxproj
index 26ec72c9b..36501fea3 100644
--- a/build/libaegisub/libaegisub.vcxproj
+++ b/build/libaegisub/libaegisub.vcxproj
@@ -127,6 +127,7 @@
       <ForcedIncludeFiles></ForcedIncludeFiles>
     </ClCompile>
     <ClCompile Include="$(SrcDir)lua\modules\re.cpp" />
+    <ClCompile Include="$(SrcDir)lua\modules\unicode.cpp" />
     <ClCompile Include="$(SrcDir)lua\script_reader.cpp" />
     <ClCompile Include="$(SrcDir)lua\utils.cpp" />
     <ClCompile Include="$(SrcDir)windows\access.cpp" />
diff --git a/build/libaegisub/libaegisub.vcxproj.filters b/build/libaegisub/libaegisub.vcxproj.filters
index 4e1262339..8975f5378 100644
--- a/build/libaegisub/libaegisub.vcxproj.filters
+++ b/build/libaegisub/libaegisub.vcxproj.filters
@@ -319,10 +319,13 @@
     <ClCompile Include="$(SrcDir)lua\modules.cpp">
       <Filter>Lua</Filter>
     </ClCompile>
+    <ClCompile Include="$(SrcDir)lua\modules\unicode.cpp">
+      <Filter>Lua\Modules</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="$(SrcDir)include\libaegisub\charsets.def">
       <Filter>Header Files</Filter>
     </None>
   </ItemGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/libaegisub/Makefile b/libaegisub/Makefile
index ce8280629..a1be865a1 100644
--- a/libaegisub/Makefile
+++ b/libaegisub/Makefile
@@ -45,6 +45,7 @@ SRC += \
 	lua/modules/lfs.cpp \
 	lua/modules/lpeg.c \
 	lua/modules/re.cpp \
+	lua/modules/unicode.cpp \
 	lua/script_reader.cpp \
 	lua/utils.cpp \
 	unix/access.cpp \
diff --git a/libaegisub/lua/modules.cpp b/libaegisub/lua/modules.cpp
index b0c8565d1..305f9fb22 100644
--- a/libaegisub/lua/modules.cpp
+++ b/libaegisub/lua/modules.cpp
@@ -20,6 +20,7 @@
 
 extern "C" int luaopen_luabins(lua_State *L);
 extern "C" int luaopen_re_impl(lua_State *L);
+extern "C" int luaopen_unicode_impl(lua_State *L);
 extern "C" int luaopen_lfs(lua_State *L);
 extern "C" int luaopen_lpeg(lua_State *L);
 
@@ -33,6 +34,7 @@ void preload_modules(lua_State *L) {
 	lua_getfield(L, -1, "preload");
 
 	set_field(L, "aegisub.__re_impl", luaopen_re_impl);
+	set_field(L, "aegisub.__unicode_impl", luaopen_unicode_impl);
 	set_field(L, "lfs", luaopen_lfs);
 	set_field(L, "lpeg", luaopen_lpeg);
 	set_field(L, "luabins", luaopen_luabins);
diff --git a/libaegisub/lua/modules/unicode.cpp b/libaegisub/lua/modules/unicode.cpp
new file mode 100644
index 000000000..66b955497
--- /dev/null
+++ b/libaegisub/lua/modules/unicode.cpp
@@ -0,0 +1,46 @@
+// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+#include "libaegisub/lua/utils.h"
+
+#include <boost/locale.hpp>
+
+namespace {
+using namespace agi::lua;
+
+int unicode_upper(lua_State *L) {
+	push_value(L, boost::locale::to_upper(check_string(L, 1)));
+	return 1;
+}
+
+int unicode_lower(lua_State *L) {
+	push_value(L, boost::locale::to_lower(check_string(L, 1)));
+	return 1;
+}
+
+int unicode_fold(lua_State *L) {
+	push_value(L, boost::locale::fold_case(check_string(L, 1)));
+	return 1;
+}
+}
+
+extern "C" int luaopen_unicode_impl(lua_State *L) {
+	lua_createtable(L, 0, 3);
+	set_field<unicode_upper>(L, "to_upper_case");
+	set_field<unicode_lower>(L, "to_lower_case");
+	set_field<unicode_fold>(L, "to_fold_case");
+	return 1;
+}