diff --git a/docs/index.rst b/docs/index.rst
index e9c76c32..6acfebe0 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -298,6 +298,7 @@ Available formats
    ro.onrc
    rs.pib
    ru.inn
+   ru.ogrn
    se.orgnr
    se.personnummer
    se.postnummer
diff --git a/docs/stdnum.ru.ogrn.rst b/docs/stdnum.ru.ogrn.rst
new file mode 100644
index 00000000..aee48283
--- /dev/null
+++ b/docs/stdnum.ru.ogrn.rst
@@ -0,0 +1,5 @@
+stdnum.ru.ogrn
+==============
+
+.. automodule:: stdnum.ru.ogrn
+   :members:
\ No newline at end of file
diff --git a/stdnum/ru/ogrn.py b/stdnum/ru/ogrn.py
new file mode 100644
index 00000000..087cfeb5
--- /dev/null
+++ b/stdnum/ru/ogrn.py
@@ -0,0 +1,97 @@
+
+# ogrn.py - functions for handling Russian company registration numbers
+# coding: utf-8
+#
+# Copyright (C) 2010-2024 Arthur de Jong and others
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""OGRN (Primary State Registration Number).
+
+The OGRN is a Russian  identifier for legal entities that consists of either 13 or 15 digits.
+
+>>> validate('1022200525819')
+True
+>>> validate('1022500001325')
+True
+>>> validate('10277395526422') # 14 digits
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> validate('1022500001328') # invalid check digit
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('0022500001325') # starts with 0
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('102250000') # too short
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+>>> validate('385768585948949') # 15 digits
+True
+"""
+
+import re
+
+from stdnum.exceptions import *
+
+
+def validate(text):
+    """Determine if the given string is a valid OGRN."""
+    if text[0] == '0':
+        raise InvalidComponent()
+    control_digit = int(text[-1])
+    if control_digit != calculate_control_digit(text):
+        raise InvalidChecksum()
+    return True
+
+
+def format(text):
+    """Normalize the given string to a valid OGRN."""
+    if not isinstance(text, str):
+        return None
+    match = re.compile(r'\b(\d{13}|\d{15})\b').search(text)
+    if match is None:
+        raise InvalidLength()
+    return match.group(1)
+
+
+def calculate_control_digit(grn):
+    """Calculate the control digit of the OGRN based on its length."""
+    if len(grn) == 13:
+        number = int(grn[:12])
+        mod_result = number % 11
+        calculated_digit = mod_result if mod_result != 10 else 0
+        return calculated_digit
+    elif len(grn) == 15:
+        number = int(grn[:14])
+        mod_result = number % 13
+        calculated_digit = mod_result if mod_result != 10 else 0
+        return calculated_digit
+    else:
+        raise InvalidLength()
+
+
+def is_valid(text):
+    """Check if the number is a valid OGRN."""
+    try:
+        normalized_text = format(text)
+        return bool(normalized_text and validate(normalized_text))
+    except ValidationError:
+        return False
diff --git a/tests/test_ru_ogrn.doctest b/tests/test_ru_ogrn.doctest
new file mode 100644
index 00000000..41f009da
--- /dev/null
+++ b/tests/test_ru_ogrn.doctest
@@ -0,0 +1,43 @@
+test_ru_ogrn.doctest - more detailed doctests for the stdnum.ru.ogrn module
+
+Copyright (C) 2010-2024 Arthur de Jong and others
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA
+
+
+This file contains more detailed doctests for the stdnum.ru.ogrn module.
+
+These tests validate the format, normalization, and validity of various
+OGRN numbers, ensuring they conform to expected behavior.
+
+>>> from stdnum.ru import ogrn
+>>> from stdnum.exceptions import *
+
+This is a list of OGRNs that should all be valid numbers:
+
+>>> valid_numbers = '''
+...
+... 1027739552642
+... 1022600000092
+... 1022500000566
+... 1027100000311
+... 1022400007508
+... 1022300001811
+... 1022300000502
+...
+... '''
+>>> [x for x in valid_numbers.splitlines() if x and not ogrn.is_valid(x)]
+[]
diff --git a/tox.ini b/tox.ini
index f338dd9a..7b0bbb36 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,7 @@
 [tox]
 envlist = py{27,36,37,38,39,310,311,312,py,py3},flake8,docs,headers
 skip_missing_interpreters = true
+requires = virtualenv<20.22.0
 
 [testenv]
 deps = pytest