diff --git a/galaxy_importer/constants.py b/galaxy_importer/constants.py
index 92d278a4..22bf164c 100644
--- a/galaxy_importer/constants.py
+++ b/galaxy_importer/constants.py
@@ -59,6 +59,11 @@
 # uppercase letters, numbers, underscores, and hyphens with
 # a length in the inclusive range [1, 55].
 LEGACY_ROLE_NAME_REGEXP = re.compile("^[a-zA-Z0-9-_]{1,55}$")
+# Matches namespaces: Namespace names should match any valid
+# GitHub username. Username may only contain alphanumeric characters
+# or single hyphens, and cannot begin or end with a hyphen
+# Maximum of 39 char tested in the validator
+LEGACY_NAMESPACE_REGEXP = re.compile("^([a-zA-Z0-9]+-?)+[a-zA-Z0-9]$")
 
 
 class ContentCategory(enum.Enum):
diff --git a/galaxy_importer/schema.py b/galaxy_importer/schema.py
index bd7b4e36..ad1c6f16 100644
--- a/galaxy_importer/schema.py
+++ b/galaxy_importer/schema.py
@@ -30,6 +30,7 @@
 MAX_LENGTH_AUTHOR = 64
 MAX_LENGTH_LICENSE = 32
 MAX_LENGTH_NAME = 64
+MAX_LENGTH_NAMESPACE = 39
 MAX_LENGTH_TAG = 64
 MAX_LENGTH_URL = 2000
 MAX_LENGTH_VERSION = 128
@@ -388,6 +389,7 @@ class LegacyGalaxyInfo(object):
     """Represents legacy role metadata galaxy_info field."""
 
     role_name = attr.ib(default=None)
+    namespace = attr.ib(default=None)
     author = attr.ib(default=None)
     description = attr.ib(default=None)
     company = attr.ib(default=None)
@@ -400,6 +402,7 @@ class LegacyGalaxyInfo(object):
     galaxy_tags = attr.ib(factory=list)
 
     @role_name.validator
+    @namespace.validator
     @author.validator
     @description.validator
     @company.validator
@@ -439,6 +442,15 @@ def _validate_role_name(self, attribute, value):
         if value is not None and not constants.LEGACY_ROLE_NAME_REGEXP.match(value):
             raise exc.LegacyRoleSchemaError(f"role name {value} is invalid")
 
+    @namespace.validator
+    def _validate_namespace(self, attribute, value):
+        """Ensure namespace matches the regular expression."""
+
+        if value is not None and (
+            not constants.LEGACY_NAMESPACE_REGEXP.match(value) or len(value) > MAX_LENGTH_NAMESPACE
+        ):
+            raise exc.LegacyRoleSchemaError(f"namespace {value} is invalid")
+
     @author.validator
     def _validate_author(self, attribute, value):
         """Ensure the author value is not too long."""
diff --git a/tests/unit/test_loader_legacy.py b/tests/unit/test_loader_legacy.py
index 2c94b323..578fb6b9 100644
--- a/tests/unit/test_loader_legacy.py
+++ b/tests/unit/test_loader_legacy.py
@@ -18,6 +18,7 @@
 
 galaxy_info:
   role_name: my_role
+  namespace: my_namespace
   author: John Doe
   description: Some generic role description
   platforms:
@@ -96,6 +97,7 @@ def test_load_values(populated_role_root):
 
     galaxy_info = data.metadata.galaxy_info
     assert galaxy_info.role_name == "my_role"
+    assert galaxy_info.namespace == "my_namespace"
     assert galaxy_info.author == "John Doe"
     assert galaxy_info.description == "Some generic role description"
     assert galaxy_info.platforms == [