diff --git a/application.py b/application.py
index 6641381..800f953 100755
--- a/application.py
+++ b/application.py
@@ -116,7 +116,7 @@ class Application(object):
                  'latex', 'insertmini', 'conf', 'haskell', 'erlang',
                  'iperl', 'iperlmini', 'ipython', 'ipythonmini', 'awk',
                  'shell', 'shellmini', 'fstab', 'yacc', 'pipe',
-                 'mbox', 'error', 'lua', 'lily'
+                 'mbox', 'error', 'lua', 'lily', 'forth'
         )
         for name in names:
             exec("import mode.%s; mode.%s.install(self)" % (name, name))
diff --git a/mode/forth.py b/mode/forth.py
new file mode 100644
index 0000000..576c786
--- /dev/null
+++ b/mode/forth.py
@@ -0,0 +1,35 @@
+from mode import Fundamental
+from lex import Grammar, PatternRule, RegionRule, NocasePatternRule, NocaseRegionRule
+
+class DataGrammar(Grammar):
+    rules = [PatternRule(r'data', r'[^)]+')]
+
+class ForthGrammar(Grammar):
+    rules = [
+        PatternRule(r'comment', r"\\.*$"),
+        RegionRule(r'comment', r'\(', DataGrammar, r'\)'),
+        NocaseRegionRule(r'comment', r'0 \[if\]', DataGrammar, r'\[(?:endif|then)\]'),
+        PatternRule(r'delimiter', r"[:;\[\]]"),
+        NocasePatternRule(r'keyword', r'(?:variable|value|until|tuck|truth|to|then|test|swap|step|see|rot|roll|recurse|r>|pick|over|mod|m\*|loop|locals|invert|if|hex|here|fsort|fln|fexp|f!|f@|f\+|f-|f\*|f/|execute|endif|else|dup|drop|does>|do|decimal|d!|d@|create|constant|cells|cell|c!|c@|bye|begin|allot|\[(?:if|then|endif)\]|>r|!|@|\+loop|\+|-|\*/mod|\*/|\*|/mod|/)(?=[ \n])'),
+        PatternRule(r'forth_def', r'(?<=:) +[^ ]+'),
+        NocasePatternRule(r'number', r"'[a-z]"),
+        NocasePatternRule(r'number', r'%?-?[0-1]+\.?'),
+        NocasePatternRule(r'number', r'[&#]?-?[0-9]+\.?'),
+        NocasePatternRule(r'number', r"(?:0x|\$)[0-9a-f]+\.?"),
+        NocasePatternRule(r'number', r'[+-]?[0-9]+\.?e?[+-][0-9]+'),
+        PatternRule(r'forth_word', r'[^ ]+'),
+        PatternRule(r'spaces', r' +'),
+        PatternRule(r'eol', r'\n'),
+    ]
+
+class Forth(Fundamental):
+    modename   = 'FORTH'
+    extensions = ['.fs']
+    grammar    = ForthGrammar
+    commentc   = '\\'
+    colors     = {
+        'forth_def':  ('blue', 'default', 'bold'),
+        'forth_word': ('yellow', 'default', 'bold'),
+    }
+
+install = Forth.install