diff --git a/.gitmodules b/.gitmodules
index 86a11e9d..2c612bfe 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -630,6 +630,9 @@
 [submodule "vendor/grammars/Lean.tmbundle"]
 	path = vendor/grammars/Lean.tmbundle
 	url = https://github.com/leanprover/Lean.tmbundle
+[submodule "vendor/grammars/ampl"]
+	path = vendor/grammars/ampl
+	url = https://github.com/ampl/sublime-ampl
 [submodule "vendor/grammars/openscad.tmbundle"]
 	path = vendor/grammars/openscad.tmbundle
 	url = https://github.com/tbuser/openscad.tmbundle
diff --git a/grammars.yml b/grammars.yml
index caec63e9..3b7596b6 100644
--- a/grammars.yml
+++ b/grammars.yml
@@ -143,6 +143,8 @@ vendor/grammars/actionscript3-tmbundle:
 - text.xml.flex-config
 vendor/grammars/ada.tmbundle:
 - source.ada
+vendor/grammars/ampl:
+- source.ampl
 vendor/grammars/ant.tmbundle:
 - text.xml.ant
 vendor/grammars/antlr.tmbundle:
diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 195f8b71..4bd9f71c 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -41,6 +41,14 @@ AGS Script:
   tm_scope: source.c++
   ace_mode: c_cpp
 
+AMPL:
+  type: programming
+  color: "#00008B"
+  extensions:
+  - .ampl
+  tm_scope: source.ampl
+  ace_mode: text
+
 ANTLR:
   type: programming
   color: "#9DC3FF"
diff --git a/samples/AMPL/toy.ampl b/samples/AMPL/toy.ampl
new file mode 100644
index 00000000..0ca0c7cf
--- /dev/null
+++ b/samples/AMPL/toy.ampl
@@ -0,0 +1,25 @@
+# A toy knapsack problem from the LocalSolver docs written in AMPL.
+
+set I;
+param Value{I};
+param Weight{I};
+param KnapsackBound;
+var Take{I} binary;
+
+maximize TotalValue: sum{i in I} Take[i] * Value[i];
+s.t. WeightLimit: sum{i in I} Take[i] * Weight[i] <= KnapsackBound;
+
+data;
+
+param:
+I: Weight Value :=
+0    10     1
+1    60    10
+2    30    15
+3    40    40
+4    30    60
+5    20    90
+6    20   100
+7     2    15;
+
+param KnapsackBound := 102;
diff --git a/vendor/grammars/ampl b/vendor/grammars/ampl
new file mode 160000
index 00000000..2e399ebf
--- /dev/null
+++ b/vendor/grammars/ampl
@@ -0,0 +1 @@
+Subproject commit 2e399ebf4aec6b5b81f01d4cbee965f77852ce86