diff --git a/lib/rouge/demos/ion b/lib/rouge/demos/ion
new file mode 100644
index 0000000000..d9a699d2f6
--- /dev/null
+++ b/lib/rouge/demos/ion
@@ -0,0 +1,20 @@
+/**
+ * Sample Ion document.
+ */
+{
+  key: "value",
+  'float': 1_234e-5,
+  "annotation": type:: null.string,
+  list: 'things':: ['symbol', nan, +inf, -inf, "other"],
+  sexp: (concat ('symbol' [list] "string" null)),
+  date: date:: 1970-01-01T00:00Z,
+  "long string": str:: (
+    '''
+    long strings are neat
+    '''
+  ),
+  struct: {
+    nested: { value: int:: 12_345 },
+  },
+  blob: {{ SGVsbG8sIFdvcmxkIQ== }}, // Hello, World!
+}
diff --git a/lib/rouge/lexers/ion.rb b/lib/rouge/lexers/ion.rb
new file mode 100644
index 0000000000..7e74c19d50
--- /dev/null
+++ b/lib/rouge/lexers/ion.rb
@@ -0,0 +1,175 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+
+module Rouge
+  module Lexers
+    class Ion < RegexLexer
+      title 'Ion'
+      desc 'Amazon Ion (https://amazon-ion.github.io/ion-docs)'
+      tag 'ion'
+      filenames '*.ion'
+      mimetypes 'application/ion'
+
+      escapes = %r{\\(?:[\\abtR"'/?\\]|x\h{2}|u\h{4}|U\h{8})}
+      q = %r{'(?:#{escapes}|\\'|[^"\n\r])+'}
+      qq = %r{"(?:#{escapes}|\\"|[^"\n\r])+"}
+      qqq = %r{'''}
+      symbol = %r{[A-Za-z_\$](?:[0-9A-Za-z_\$])*}
+
+      state :qq do
+        rule qq, Literal::String::Double
+      end
+
+      state :qqq do
+        rule %r{'''}, Literal::String::Double, :pop!
+        rule %r{[^']+}m, Literal::String::Double
+        rule %r{'}, Literal::String::Double
+      end
+
+      state :quotes do
+        rule qqq, Literal::String::Double, :qqq
+        mixin :qq
+        rule symbol, Literal::String::Symbol
+        rule q, Literal::String::Symbol
+      end
+
+      state :annotation do
+        annotation = %r{(?:[\u{0020}-\u{0026}]|[\u{0028}-\u{005B}]|[\u{005D}-\u{FFFF}]|[\t\b\f ])+}
+        rule %r{('#{annotation}'|#{symbol})(\s*)(::)} do
+          groups Name::Decorator, Text::Whitespace, Operator
+        end
+      end
+
+      state :comments do
+        rule %r{/\*.*?\*/}m, Comment::Multiline
+        rule %r{//.*?$}, Comment::Single
+      end
+
+      state :constants do
+        rule %r{(?:true|false)\b}, Name::Builtin
+        rule %r{null(?:\.(?:blob|bool|clob|decimal|float|int|list|null|sexp|string|struct|symbol|timestamp))?\b}, Name::Builtin
+      end
+
+      state :numbers do
+        rule %r{0b[01]+(?:_[01]+)*\b}, Literal::Number::Bin
+        rule %r{0x\h+(?:_\h+)*\b}, Literal::Number::Hex
+        rule %r{(?:nan|[+-]inf)\b}, Literal::Number::Float
+
+        integer = %r{-?(?:0|[1-9]\d*(?:_\d+)*)}
+        rule %r{#{integer}[.dD][+-]?(?:#{integer})*(?:[dDeE][+-]?#{integer})?}, Literal::Number::Float
+        rule %r{#{integer}[dDeE][+-]?#{integer}}, Literal::Number::Float
+        rule integer, Literal::Number::Integer
+      end
+
+      state :timestamps do
+        year = %r{000[1-9]|00[1-9]\d|0[1-9]\d{2}|[1-9]\d{3}}
+        month = %r{0[1-9]|1[0-2]}
+        day = %r{0[1-9]|[12]\d|3[01]}
+        date = %r{#{year}-#{month}-#{day}}
+
+        hour = %r{[01]\d|2[0-3]}
+        minute = %r{[0-5]\d}
+        second = %r{[0-5]\d(?:\.\d+)?}
+        offset = %r{Z|[+-]#{hour}:#{minute}}
+        time = %r{#{hour}:#{minute}(?::#{second})?#{offset}}
+
+        rule %r{#{date}(T#{time}?)?|#{year}(?:-#{month})?T}, Literal::Date
+      end
+
+      state :whitespace do
+        rule %r{\s+}, Text::Whitespace
+      end
+
+      state :blob do
+        rule %r/}}/, Punctuation::Indicator, :pop!
+
+        rule qqq, Literal::String::Double, :qqq
+        mixin :qq
+        mixin :whitespace
+
+        # no attempt to validate the Base64 blob
+        rule %r{(?:[A-Za-z0-9/\+=]+)}, Literal
+      end
+
+      state :containers do
+        rule %r/{{/, Punctuation::Indicator, :blob
+        rule %r{\[}, Punctuation::Indicator, :list
+        rule %r{\(}, Punctuation::Indicator, :sexp
+        rule %r/{/, Punctuation::Indicator, :struct
+      end
+
+      state :list do
+        rule %r{]}, Punctuation::Indicator, :pop!
+
+        mixin :containers
+        mixin :comments
+        mixin :annotation
+        mixin :whitespace
+        mixin :constants
+        mixin :timestamps
+        mixin :numbers
+        mixin :quotes
+
+        rule %r{[,=;]}, Punctuation
+      end
+
+      state :sexp do
+        rule %r{\)}, Punctuation::Indicator, :pop!
+        rule %r{(?:\+\+|--|<<|>>|\&\&|\.\.|\|\||[-+\*/=<>|&$^.#!%?@`~])}, Operator
+
+        mixin :containers
+        mixin :comments
+        mixin :annotation
+        mixin :whitespace
+        mixin :constants
+        mixin :timestamps
+        mixin :numbers
+        mixin :quotes
+      end
+
+      state :struct do
+        rule %r/}/, Punctuation::Indicator, :pop!
+
+        rule %r{(#{q}|#{qq}|#{symbol})(\s*)(:)} do
+          groups Name::Label, Text::Whitespace, Punctuation
+          push :value
+        end
+
+        mixin :containers
+        mixin :comments
+        mixin :whitespace
+      end
+
+      state :value do
+        mixin :containers
+        mixin :comments
+        mixin :whitespace
+        mixin :annotation
+        mixin :constants
+        mixin :timestamps
+        mixin :numbers
+        mixin :quotes
+
+        rule %r{,}, Punctuation, :pop!
+
+        rule %r/(})/ do
+          groups Punctuation::Indicator
+          pop!(2)
+        end
+      end
+
+      state :root do
+        rule %r{\s*\A\$(?:ion_1_0|ion_symbol_table)\b}, Name::Builtin::Pseudo
+
+        mixin :comments
+        mixin :annotation
+        mixin :constants
+        mixin :timestamps
+        mixin :numbers
+        mixin :containers
+        mixin :quotes
+        mixin :whitespace
+      end
+    end
+  end
+end
diff --git a/spec/lexers/ion_spec.rb b/spec/lexers/ion_spec.rb
new file mode 100644
index 0000000000..f89b1d19d5
--- /dev/null
+++ b/spec/lexers/ion_spec.rb
@@ -0,0 +1,199 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+
+describe Rouge::Lexers::Ion do
+  let(:subject) { Rouge::Lexers::Ion.new }
+
+  describe 'guessing' do
+    include Support::Guessing
+
+    it 'guesses by filename' do
+      assert_guess :filename => 'file.ion'
+    end
+
+    it 'guesses by mimetype' do
+      assert_guess :mimetype => 'application/ion'
+    end
+  end
+
+  describe 'lexing' do
+    include Support::Lexing
+
+    it 'handles a basic file' do
+      ion = <<~ION
+        /**
+         * comment
+         */
+        'annotation' :: {
+          a: 1,
+          'b': 2.0,
+          "c": float:: 1.23e-4,
+          "d": 'null':: null.symbol,
+          "e": 'timestamps':: [
+            1970-01-01T00:00Z,
+            1970T,
+          ],
+          f: 'constants and such':: [
+            nancy, nan,
+            "+infinity", +inf, -inf,
+            truee, false, true,
+            null.null, null,
+            nullish,
+          ],
+          "g": (add [0b101, 0xdeadbeef, -1_000] "hello"),
+          h: { i: '''string''', },
+          j: {{ aW9u }},
+        }
+      ION
+
+      assert_no_errors ion
+
+      assert_tokens_equal ion,
+        ["Comment.Multiline", "/**\n * comment\n */"],
+        ["Text.Whitespace", "\n"],
+        ["Name.Decorator", "'annotation'"],
+        ["Text.Whitespace", " "],
+        ["Operator", "::"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "{"],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "a"],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Integer", "1"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "'b'"],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Float", "2.0"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "\"c\""],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Name.Decorator", "float"],
+        ["Operator", "::"],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Float", "1.23e-4"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "\"d\""],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Name.Decorator", "'null'"],
+        ["Operator", "::"],
+        ["Text.Whitespace", " "],
+        ["Name.Builtin", "null.symbol"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "\"e\""],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Name.Decorator", "'timestamps'"],
+        ["Operator", "::"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "["],
+        ["Text.Whitespace", "\n    "],
+        ["Literal.Date", "1970-01-01T00:00Z"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n    "],
+        ["Literal.Date", "1970T"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Punctuation.Indicator", "]"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "f"],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Name.Decorator", "'constants and such'"],
+        ["Operator", "::"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "["],
+        ["Text.Whitespace", "\n    "],
+        ["Literal.String.Symbol", "nancy"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Float", "nan"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n    "],
+        ["Literal.String.Double", "\"+infinity\""],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Float", "+inf"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Float", "-inf"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n    "],
+        ["Literal.String.Symbol", "truee"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Name.Builtin", "false"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Name.Builtin", "true"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n    "],
+        ["Name.Builtin", "null.null"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Name.Builtin", "null"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n    "],
+        ["Literal.String.Symbol", "nullish"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Punctuation.Indicator", "]"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "\"g\""],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "("],
+        ["Literal.String.Symbol", "add"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "["],
+        ["Literal.Number.Bin", "0b101"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Hex", "0xdeadbeef"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Literal.Number.Integer", "-1_000"],
+        ["Punctuation.Indicator", "]"],
+        ["Text.Whitespace", " "],
+        ["Literal.String.Double", "\"hello\""],
+        ["Punctuation.Indicator", ")"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "h"],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "{"],
+        ["Text.Whitespace", " "],
+        ["Name.Label", "i"],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Literal.String.Double", "'''string'''"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "}"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n  "],
+        ["Name.Label", "j"],
+        ["Punctuation", ":"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "{{"],
+        ["Text.Whitespace", " "],
+        ["Literal", "aW9u"],
+        ["Text.Whitespace", " "],
+        ["Punctuation.Indicator", "}}"],
+        ["Punctuation", ","],
+        ["Text.Whitespace", "\n"],
+        ["Punctuation.Indicator", "}"],
+        ["Text.Whitespace", "\n"]
+    end
+  end
+end
diff --git a/spec/visual/samples/ion b/spec/visual/samples/ion
new file mode 100644
index 0000000000..4863134b8a
--- /dev/null
+++ b/spec/visual/samples/ion
@@ -0,0 +1,23 @@
+/**
+ * comment
+ */
+'annotation' :: {
+  a: 1,
+  'b': 2.0,
+  "c": float:: 1.23e-4,
+  "d": 'null':: null.symbol,
+  "e": 'timestamps':: [
+    1970-01-01T00:00Z,
+    1970T,
+  ],
+  f: 'constants and such':: [
+    nancy, nan,
+    "+infinity", +inf, -inf,
+    truee, false, true,
+    null.null, null,
+    nullish,
+  ],
+  "g": (add [0b101, 0xdeadbeef, -1_000] "hello"),
+  h: { i: '''string''', },
+  j: {{ aW9u }},
+}