diff --git a/graphene/utils/str_converters.py b/graphene/utils/str_converters.py
index 216b0547..00e2196c 100644
--- a/graphene/utils/str_converters.py
+++ b/graphene/utils/str_converters.py
@@ -1,4 +1,5 @@
 import re
+from unidecode import unidecode
 
 
 # Adapted from this response in Stackoverflow
@@ -18,4 +19,4 @@ def to_snake_case(name):
 
 
 def to_const(string):
-    return re.sub(r"[\W|^]+", "_", string).upper()  # noqa
+    return re.sub(r"[\W|^]+", "_", unidecode(string)).upper()  # noqa
diff --git a/graphene/utils/tests/test_str_converters.py b/graphene/utils/tests/test_str_converters.py
index 786149d9..b11cda91 100644
--- a/graphene/utils/tests/test_str_converters.py
+++ b/graphene/utils/tests/test_str_converters.py
@@ -21,3 +21,7 @@ def test_camel_case():
 
 def test_to_const():
     assert to_const('snakes $1. on a "#plane') == "SNAKES_1_ON_A_PLANE"
+
+
+def test_to_const_unicode():
+    assert to_const('Skoða þetta unicode stöff') == 'SKODA_THETTA_UNICODE_STOFF'
diff --git a/setup.py b/setup.py
index 58ec7345..d7077f0c 100644
--- a/setup.py
+++ b/setup.py
@@ -86,6 +86,7 @@ setup(
         "graphql-core>=3.0.0,<4",
         "graphql-relay>=3.0.0,<4",
         "aniso8601>=6,<9",
+        "unidecode>=1.1.1,<2",
     ],
     tests_require=tests_require,
     extras_require={"test": tests_require, "dev": dev_requires},