diff --git a/filetype.vim b/filetype.vim
index 66319853..e14867f8 100644
--- a/filetype.vim
+++ b/filetype.vim
@@ -52,4 +52,5 @@ augroup filetypedetect
   au BufNewFile,BufRead	*.pxi				setf pyrex
   au BufRead		$HOME/.cabal/config		setf cabal
   au BufNewFile,BufRead *.stp				setf stap
+  au BufNewFile,BufRead *.io				setf io
 augroup END
diff --git a/scripts.vim b/scripts.vim
index 35aa6309..96672804 100644
--- a/scripts.vim
+++ b/scripts.vim
@@ -26,3 +26,7 @@ if getline(1) =~ '^#!\s*/usr/bin/sage\s\+-python'
   setfiletype python
   finish
 endif
+if getline(1) =~ '^#!.*\<io'
+  setfiletype io
+  finish
+endif
diff --git a/syntax/io.vim b/syntax/io.vim
new file mode 100644
index 00000000..ea103c79
--- /dev/null
+++ b/syntax/io.vim
@@ -0,0 +1,67 @@
+" Vim Syntax File
+" Language:     Io
+" Creator:      Scott Dunlop <swdunlop@verizon.net>
+" Fixes:        Manpreet Singh <junkblocker@yahoo.com>
+"               Jonathan Wright <quaggy@gmail.com>
+"               Erik Garrison <erik.garrison@gmail.com>
+" Last Change:  2006 Nov 16
+
+if version < 600
+    syntax clear
+elseif exists("b:current_syntax")
+    finish
+endif
+
+syntax case match
+
+" equivalent to io-mode-prototype-names in io-mode.el
+syntax keyword xType Array AudioDevice AudioMixer Block Box Buffer CFunction
+syntax keyword xType CGI Color Curses DBM DNSResolver DOConnection DOProxy
+syntax keyword xType DOServer Date Directory Duration DynLib Error Exception
+syntax keyword xType FFT File Fnmatch Font Future GL GLE GLScissor GLU
+syntax keyword xType GLUCylinder GLUQuadric GLUSphere GLUT Host Image Importer
+syntax keyword xType LinkList List Lobby Locals MD5 MP3Decoder MP3Encoder Map
+syntax keyword xType Message Movie Notification Number Object
+syntax keyword xType OpenGL Point Protos Regex SGML SGMLElement SGMLParser SQLite Server Sequence
+syntax keyword xType ShowMessage SleepyCat SleepyCatCursor Socket
+syntax keyword xType SocketManager Sound Soup Store String Tree UDPSender
+syntax keyword xType UPDReceiver URL User Warning WeakLink
+syntax keyword xType true false nil Random BigNum Sequence
+
+" equivalent to io-mode-message-names in io-mode.el
+syntax keyword xKeyword activate activeCoroCount and asString block break
+syntax keyword xKeyword catch clone collectGarbage compileString continue
+syntax keyword xKeyword do doFile doMessage doString else elseif exit for
+syntax keyword xKeyword foreach forward getSlot getenv hasSlot if ifFalse
+syntax keyword xKeyword ifNil ifNilEval ifTrue isActive isNil isResumable list message
+syntax keyword xKeyword method or parent pass pause perform
+syntax keyword xKeyword performWithArgList print println proto raise raiseResumable
+syntax keyword xKeyword removeSlot resend resume return
+syntax keyword xKeyword schedulerSleepSeconds self sender
+syntax keyword xKeyword setSchedulerSleepSeconds setSlot shallowCopy
+syntax keyword xKeyword slotNames super system then thisBlock thisContext
+syntax keyword xKeyword call try type uniqueId updateSlot wait while
+syntax keyword xKeyword write yield
+
+syntax region xOperator start=':' end='='
+syntax region xOperator start='!' end='='
+syntax region xOperator start='\.' end='\.'
+syntax region xOperator start='\.' end='[^\.]'he=e-1
+syntax region xOperator start='=' end='='
+syntax region xOperator start='=' end=' 'he=e-1
+syntax region xOperator start='[*>=+-]' end='[ 0-9]'he=e-1
+
+syntax region xString start=/"/ skip=/\\./ end=/"/
+syntax region xString start=/"""/ skip=/\\./ end=/"""/
+
+syntax region xComment start='#' end='$' keepend
+syntax region xComment start=/\/\*/ end=/\*\//
+syntax region xComment start=/\/\// end=/$/ keepend
+
+highlight link xType Type
+highlight link xKeyword Keyword
+highlight link xString String
+highlight link xComment Comment
+highlight link xOperator Operator
+
+let b:current_syntax = "io"