diff --git a/runtime/syntax/wast.vim b/runtime/syntax/wast.vim
new file mode 100644
index 0000000..245d5f6
--- /dev/null
+++ b/runtime/syntax/wast.vim
@@ -0,0 +1,84 @@
+" Vim syntax file
+" Language:     WebAssembly
+" Maintainer:   rhysd <lin90162@yahoo.co.jp>
+" Last Change:  Jul 29, 2018
+" For bugs, patches and license go to https://github.com/rhysd/vim-wasm
+
+if exists("b:current_syntax")
+    finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+syn cluster wastCluster       contains=wastModule,wastInstWithType,wastInstGeneral,wastParamInst,wastControlInst,wastString,wastNamedVar,wastUnnamedVar,wastFloat,wastNumber,wastComment,wastList,wastType
+
+" Instructions
+" https://webassembly.github.io/spec/core/text/instructions.html
+" Note: memarg (align=,offset=) can be added to memory instructions
+syn match   wastInstWithType  "\%((\s*\)\@<=\<\%(i32\|i64\|f32\|f64\|memory\)\.[[:alnum:]_]\+\%(/\%(i32\|i64\|f32\|f64\)\)\=\>\%(\s\+\%(align\|offset\)=\)\=" contained display
+syn match   wastInstGeneral   "\%((\s*\)\@<=\<[[:alnum:]_]\+\>" contained display
+" https://webassembly.github.io/spec/core/text/instructions.html#control-instructions
+syn match   wastControlInst   "\%((\s*\)\@<=\<\%(block\|end\|loop\|if\|else\|unreachable\|nop\|br\|br_if\|br_table\|return\|call\|call_indirect\)\>" contained display
+" https://webassembly.github.io/spec/core/text/instructions.html#parametric-instructions
+syn match   wastParamInst     "\%((\s*\)\@<=\<\%(drop\|select\)\>" contained display
+
+" Identifiers
+" https://webassembly.github.io/spec/core/text/values.html#text-id
+syn match   wastNamedVar      "$\+[[:alnum:]!#$%&'∗./:=><?@\\^_`~+-]*" contained display
+syn match   wastUnnamedVar    "$\+\d\+[[:alnum:]!#$%&'∗./:=><?@\\^_`~+-]\@!" contained display
+
+" String literals
+" https://webassembly.github.io/spec/core/text/values.html#strings
+syn region  wastString        start=+"+ skip=+\\\\\|\\"+ end=+"+ contained contains=wastStringSpecial
+syn match   wastStringSpecial "\\\x\x\|\\[tnr'\\\"]\|\\u\x\+" contained containedin=wastString
+
+" Float literals
+" https://webassembly.github.io/spec/core/text/values.html#floating-point
+syn match   wastFloat         "\<-\=\d\%(_\=\d\)*\%(\.\d\%(_\=\d\)*\)\=\%([eE][-+]\=\d\%(_\=\d\)*\)\=" display contained
+syn match   wastFloat         "\<-\=0x\x\%(_\=\d\)*\%(\.\x\%(_\=\x\)*\)\=\%([pP][-+]\=\d\%(_\=\d\)*\)\=" display contained
+syn keyword wastFloat         inf nan contained
+
+" Integer literals
+" https://webassembly.github.io/spec/core/text/values.html#integers
+syn match   wastNumber        "\<-\=\d\%(_\=\d\)*\>" display contained
+syn match   wastNumber        "\<-\=0x\x\%(_\=\x\)*\>" display contained
+
+" Comments
+" https://webassembly.github.io/spec/core/text/lexical.html#comments
+syn region  wastComment       start=";;" end="$" display
+syn region  wastComment       start="(;;\@!" end=";)"
+
+syn region  wastList          matchgroup=wastListDelimiter start="(;\@!" matchgroup=wastListDelimiter end=";\@<!)" contains=@wastCluster
+
+" Types
+" https://webassembly.github.io/spec/core/text/types.html
+syn keyword wastType          i64 i32 f64 f32 param result anyfunc mut contained
+syn match   wastType          "\%((\_s*\)\@<=func\%(\_s*[()]\)\@=" display contained
+
+" Modules
+" https://webassembly.github.io/spec/core/text/modules.html
+syn keyword wastModule        module type export import table memory global data elem contained
+syn match   wastModule        "\%((\_s*\)\@<=func\%(\_s\+\$\)\@=" display contained
+
+syn sync lines=100
+
+hi def link wastModule        PreProc
+hi def link wastListDelimiter Delimiter
+hi def link wastInstWithType  Operator
+hi def link wastInstGeneral   Operator
+hi def link wastControlInst   Statement
+hi def link wastParamInst     Conditional
+hi def link wastString        String
+hi def link wastStringSpecial Special
+hi def link wastNamedVar      Identifier
+hi def link wastUnnamedVar    PreProc
+hi def link wastFloat         Float
+hi def link wastNumber        Number
+hi def link wastComment       Comment
+hi def link wastType          Type
+
+let b:current_syntax = "wast"
+
+let &cpo = s:cpo_save
+unlet s:cpo_save