diff --git a/lib/bitclust/rdcompiler.rb b/lib/bitclust/rdcompiler.rb
index aecc1a0..eba7182 100644
--- a/lib/bitclust/rdcompiler.rb
+++ b/lib/bitclust/rdcompiler.rb
@@ -451,21 +451,31 @@ def method_signature(sig_line, first)
     end
 
     BracketLink = /\[\[[\w-]+?:[!-~]+?(?:\[\] )?\]\]/n
+    # BitClust には ISO/JIS へのリンク機能がないため、[[ISO:8601]]/[[JIS:X 0301]] は
+    # リンクにせず平文で表示する (rurema/bitclust#236)。引数に空白を含む JIS も拾う。
+    StandardRef = /\[\[(?:ISO|JIS):[!-~][!-~ ]*?\]\]/n
     NeedESC = /[&"<>]/
 
     def compile_text(str)
       escape_table = HTMLUtils::ESC
-      str.gsub(/(#{NeedESC})|(#{BracketLink})/o) {
+      str.gsub(/(#{NeedESC})|(#{StandardRef})|(#{BracketLink})/o) {
         # @type var char: '&' | '"' | '<' | '>'
         if    char = _ = $1 then escape_table[char]
-        elsif tok  = $2 then bracket_link(tok[2..-3] || raise)
-        elsif tok  = $3 then seems_code(tok)
+        elsif tok  = $2 then standard_ref(tok[2..-3] || raise)
+        elsif tok  = $3 then bracket_link(tok[2..-3] || raise)
         else
           raise 'must not happen'
         end
       }
     end
 
+    def standard_ref(link)
+      # 例: "ISO:8601" -> "ISO 8601", "JIS:X 0301" -> "JIS X 0301"
+      type, _arg = link.split(':', 2)
+      arg = _arg&.strip or raise
+      escape_html("#{type} #{arg}")
+    end
+
     def bracket_link(link, label = nil, frag = nil)
       type, _arg = link.split(':', 2)
       arg = _arg&.rstrip or raise
diff --git a/sig/bitclust/rdcompiler.rbs b/sig/bitclust/rdcompiler.rbs
index 5b232a0..406f7c3 100644
--- a/sig/bitclust/rdcompiler.rbs
+++ b/sig/bitclust/rdcompiler.rbs
@@ -118,10 +118,14 @@ module BitClust
 
     BracketLink: ::Regexp
 
+    StandardRef: ::Regexp
+
     NeedESC: ::Regexp
 
     def compile_text: (String str) -> String
 
+    def standard_ref: (String link) -> String
+
     def bracket_link: (String link, ?String? label, ?String? frag) -> String
 
     def protect: (String src) { () -> String } -> String
diff --git a/test/test_rdcompiler.rb b/test/test_rdcompiler.rb
index cc0013a..9a402e6 100644
--- a/test/test_rdcompiler.rb
+++ b/test/test_rdcompiler.rb
@@ -706,6 +706,8 @@ def test_invalid_case
        "man header"          => ['[[man:sys/socket.h(header)]]', '<a class="external" href="http://www.opengroup.org/onlinepubs/009695399/basedefs/sys/socket.h.html">sys/socket.h(header)</a>'],
        "man system call"     => ['[[man:fopen(3linux)]]', '<a class="external" href="http://man7.org/linux/man-pages/man3/fopen.3.html">fopen(3linux)</a>'],
        "RFC"                 => ['[[RFC:2822]]',      '<a class="external" href="https://tools.ietf.org/html/rfc2822">[RFC2822]</a>'],
+       "ISO standard"        => ['[[ISO:8601]]',      'ISO 8601'],
+       "JIS standard"        => ['[[JIS:X 0301]]',    'JIS X 0301'],
        "special var $~"      => ['[[m:$~]]',          '<a href="dummy/method/Kernel/v/=7e">$~</a>'],
        "special var $,"      => ['[[m:$,]]',          '<a href="dummy/method/Kernel/v/=2c">$,</a>'],
        "extra close bracket" => ['[[c:String]]]', '<a href="dummy/class/String">String</a>]'],