diff --git a/docs/index.rst b/docs/index.rst
index 193efb12..a0dcf773 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -153,6 +153,7 @@ Available formats
    cu.ni
    cusip
    cy.vat
+   cz.bankaccount
    cz.dic
    cz.rc
    de.handelsregisternummer
diff --git a/docs/stdnum.cz.bankaccount.rst b/docs/stdnum.cz.bankaccount.rst
new file mode 100644
index 00000000..87c50963
--- /dev/null
+++ b/docs/stdnum.cz.bankaccount.rst
@@ -0,0 +1,5 @@
+stdnum.cz.bankaccount
+=====================
+
+.. automodule:: stdnum.cz.bankaccount
+   :members:
diff --git a/stdnum/cz/bankaccount.py b/stdnum/cz/bankaccount.py
new file mode 100644
index 00000000..ccb1c268
--- /dev/null
+++ b/stdnum/cz/bankaccount.py
@@ -0,0 +1,161 @@
+# bankaccount.py - functions for handling Czech bank account numbers
+# coding: utf-8
+#
+# Copyright (C) 2022 Arthur de Jong
+#
+# 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
+
+"""Czech bank account number
+
+The Czech bank account numbers consist of up to 20 digits:
+    UUUUUK-MMMMMMMMKM/XXXX
+
+The first part is prefix that is up to 6 digits. The following part is from 2 to 10 digits.
+Both parts could be filled with zeros from left if missing.
+The final 4 digits represent the bank code.
+
+More information:
+
+* https://www.penize.cz/osobni-ucty/424173-tajemstvi-cisla-uctu-klicem-pro-banky-je-11
+* http://www.zlatakoruna.info/zpravy/ucty/cislo-uctu-v-cr
+
+>>> validate('34278-0727558021/0100')
+'034278-0727558021/0100'
+>>> validate('4278-727558021/0100')  # invalid check digits (prefix)
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('34278-727558021/0000')  # invalid bank
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> format('34278-727558021/0100')
+'034278-0727558021/0100'
+"""
+
+import re
+
+from stdnum.exceptions import (
+    InvalidChecksum, InvalidComponent, InvalidFormat, ValidationError)
+from stdnum.util import clean
+
+
+_prefix_regex = r'[0-9]{0,6}'
+_root_regex = r'[0-9]{2,10}'
+_bank_regex = r'[0-9]{4}'
+_regex = r'((%s)-)?(%s)\/(%s)' % (_prefix_regex, _root_regex, _bank_regex)
+
+_root_weights = [6, 3, 7, 9, 10, 5, 8, 4, 2, 1]
+_prefix_weights = _root_weights[4:]  # prefix weights are same as root, but we are interested in last 6 weights only
+
+
+def _parse(number):
+    number = clean(number).strip()
+    match = re.match(_regex, number)
+    if match:
+        prefix = match.group(2)
+        root = match.group(3)
+        bank = match.group(4)
+        return prefix, root, bank
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    parsed = _parse(number)
+    if parsed:
+        prefix, root, bank = parsed
+        return ''.join((
+            prefix + '-' if prefix else '', root, '/', bank,
+        ))
+
+
+def _info(bank_code):
+    from stdnum import numdb
+    info = {}
+    for nr, found in numdb.get('cz/banks').info(bank_code):
+        info.update(found)
+    return info
+
+
+def info(number):
+    """Return a dictionary of data about the supplied number. This typically
+    returns the name of the bank and branch and a BIC if it is valid."""
+    parsed = _parse(number)
+    if parsed:
+        return _info(parsed[2])
+
+
+def _get_checksum(part):
+    if len(part) > 6:
+        weights = _root_weights
+        part.zfill(10)
+    else:
+        weights = _prefix_weights
+        part.zfill(6)
+
+    _sum = 0
+    for i, n in enumerate(part):
+        _sum += weights[i] * int(n)
+
+    return _sum % 11
+
+
+def is_checksum_valid(part):
+    """Check if prefix or root of bank account number is valid."""
+    return _get_checksum(part) == 0
+
+
+def is_bank_valid(bank_code):
+    """Check if bank code is valid."""
+    return 'bank' in _info(bank_code)
+
+
+def validate(number):
+    """Check if the number provided is a valid bank account number."""
+    number = format(number)  # fill missing zeros
+    if not number:
+        raise InvalidFormat()
+
+    prefix, root, bank = _parse(number)
+
+    if not is_checksum_valid(prefix):
+        raise InvalidChecksum()
+
+    if not is_checksum_valid(root):
+        raise InvalidChecksum()
+
+    if not is_bank_valid(bank):
+        raise InvalidComponent()
+
+    return number
+
+
+def is_valid(number):
+    """Check if the number provided is a valid bank account number."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
+
+
+def format(number):
+    """Reformat the number to the standard presentation format."""
+    parsed = _parse(number)
+    if parsed:
+        return ''.join((
+            (parsed[0] or '').zfill(6), '-', parsed[1].zfill(10), '/', parsed[2],
+        ))
diff --git a/stdnum/cz/banks.dat b/stdnum/cz/banks.dat
new file mode 100644
index 00000000..df1a2723
--- /dev/null
+++ b/stdnum/cz/banks.dat
@@ -0,0 +1,59 @@
+# generated from kody_bank_CR.csv downloaded from
+# https://www.cnb.cz/cs/platebni-styk/.galleries/ucty_kody_bank/download/kody_bank_CR.csv
+0100 bic="KOMBCZPP" bank="Komerční banka, a.s." certis="True"
+0300 bic="CEKOCZPP" bank="Československá obchodní banka, a. s." certis="True"
+0600 bic="AGBACZPP" bank="MONETA Money Bank, a.s." certis="True"
+0710 bic="CNBACZPP" bank="ČESKÁ NÁRODNÍ BANKA" certis="True"
+0800 bic="GIBACZPX" bank="Česká spořitelna, a.s." certis="True"
+2010 bic="FIOBCZPP" bank="Fio banka, a.s." certis="True"
+2020 bic="BOTKCZPP" bank="MUFG Bank (Europe) N.V. Prague Branch" certis="True"
+2060 bic="CITFCZPP" bank="Citfin, spořitelní družstvo" certis="True"
+2070 bic="MPUBCZPP" bank="TRINITY BANK a.s." certis="True"
+2100 bank="Hypoteční banka, a.s." certis="True"
+2200 bank="Peněžní dům, spořitelní družstvo" certis="True"
+2220 bic="ARTTCZPP" bank="Artesa, spořitelní družstvo" certis="True"
+2250 bic="CTASCZ22" bank="Banka CREDITAS a.s." certis="True"
+2260 bank="NEY spořitelní družstvo" certis="True"
+2275 bank="Podnikatelská družstevní záložna"
+2600 bic="CITICZPX" bank="Citibank Europe plc, organizační složka"
+2700 bic="BACXCZPP" bank="UniCredit Bank Czech Republic and Slovakia, a.s." certis="True"
+3030 bic="AIRACZPP" bank="Air Bank a.s." certis="True"
+3050 bic="BPPFCZP1" bank="BNP Paribas Personal Finance SA, odštěpný závod" certis="True"
+3060 bic="BPKOCZPP" bank="PKO BP S.A., Czech Branch" certis="True"
+3500 bic="INGBCZPP" bank="ING Bank N.V." certis="True"
+4000 bic="EXPNCZPP" bank="Expobank CZ a.s." certis="True"
+4300 bic="NROZCZPP" bank="Národní rozvojová banka, a.s." certis="True"
+5500 bic="RZBCCZPP" bank="Raiffeisenbank a.s." certis="True"
+5800 bic="JTBPCZPP" bank="J&T BANKA, a.s."
+6000 bic="PMBPCZPP" bank="PPF banka a.s." certis="True"
+6100 bic="EQBKCZPP" bank="Raiffeisenbank a.s. (do 31. 12. 2021 Equa bank a.s.)" certis="True"
+6200 bic="COBACZPX" bank="COMMERZBANK Aktiengesellschaft, pobočka Praha" certis="True"
+6210 bic="BREXCZPP" bank="mBank S.A., organizační složka" certis="True"
+6300 bic="GEBACZPP" bank="BNP Paribas S.A., pobočka Česká republika" certis="True"
+6700 bic="SUBACZPP" bank="Všeobecná úverová banka a.s., pobočka Praha" certis="True"
+6800 bic="VBOECZ2X" bank="Sberbank CZ, a.s. v likvidaci" certis="True"
+7910 bic="DEUTCZPX" bank="Deutsche Bank Aktiengesellschaft Filiale Prag, organizační složka" certis="True"
+7950 bank="Raiffeisen stavební spořitelna a.s." certis="True"
+7960 bank="ČSOB Stavební spořitelna, a.s." certis="True"
+7970 bank="MONETA Stavební Spořitelna, a.s." certis="True"
+7990 bank="Modrá pyramida stavební spořitelna, a.s." certis="True"
+8030 bic="GENOCZ21" bank="Volksbank Raiffeisenbank Nordoberpfalz eG pobočka Cheb" certis="True"
+8040 bic="OBKLCZ2X" bank="Oberbank AG pobočka Česká republika" certis="True"
+8060 bank="Stavební spořitelna České spořitelny, a.s." certis="True"
+8090 bic="CZEECZPP" bank="Česká exportní banka, a.s." certis="True"
+8150 bic="MIDLCZPP" bank="HSBC Continental Europe, Czech Republic" certis="True"
+8190 bank="Sparkasse Oberlausitz-Niederschlesien" certis="True"
+8198 bic="FFCSCZP1" bank="FAS finance company s.r.o."
+8199 bic="MOUSCZP2" bank="MoneyPolo Europe s.r.o."
+8200 bank="PRIVAT BANK der Raiffeisenlandesbank Oberösterreich Aktiengesellschaft, pobočka Česká republika"
+8220 bic="PAERCZP1" bank="Payment execution s.r.o."
+8230 bank="ABAPAY s.r.o."
+8240 bank="Družstevní záložna Kredit, v likvidaci"
+8250 bic="BKCHCZPP" bank="Bank of China (CEE) Ltd. Prague Branch" certis="True"
+8255 bic="COMMCZPP" bank="Bank of Communications Co., Ltd., Prague Branch odštěpný závod" certis="True"
+8265 bic="ICBKCZPP" bank="Industrial and Commercial Bank of China Limited, Prague Branch, odštěpný závod" certis="True"
+8270 bic="FAPOCZP1" bank="Fairplay Pay s.r.o."
+8280 bic="BEFKCZP1" bank="B-Efekt a.s."
+8293 bic="MRPSCZPP" bank="Mercurius partners s.r.o."
+8299 bic="BEORCZP2" bank="BESTPAY s.r.o."
+8500 bank="Ferratum Bank plc"
diff --git a/tests/test_cz_bankaccount.doctest b/tests/test_cz_bankaccount.doctest
new file mode 100644
index 00000000..926bd942
--- /dev/null
+++ b/tests/test_cz_bankaccount.doctest
@@ -0,0 +1,65 @@
+test_cz_bankaccount.doctest - more detailed doctests for stdnum.cz.bankaccount
+
+Copyright (C) 2022 Arthur de Jong
+
+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.cz.bankaccount
+module.
+
+>>> from stdnum.cz import bankaccount
+
+>>> bankaccount.validate('34278-0727558021/0100')
+'034278-0727558021/0100'
+
+>>> bankaccount.is_valid('4278-0727558021/0100')
+False
+
+>>> bankaccount.compact('34278-0727558021/0100')
+'34278-0727558021/0100'
+
+>>> bankaccount.compact('1/0100')
+
+>>> str(bankaccount.info('34278-0727558021/0100')['bic'])
+'KOMBCZPP'
+
+>>> bankaccount.info('1/0000')
+
+>>> bankaccount.validate('1/0100')
+Traceback (most recent call last):
+    ...
+bankaccount.InvalidFormat: ...
+
+>>> bankaccount.validate('8021/0100')
+Traceback (most recent call last):
+    ...
+bankaccount.InvalidChecksum: ...
+
+
+These have been found online and should all be valid numbers.
+
+>>> numbers = '''
+...
+... 19-2000145399/0800
+... 178124-4159/0710
+... 19-34222621/0710
+... 280154417/0300
+... 0500021502/0800
+...
+... '''
+>>> [x for x in numbers.splitlines() if x and not bankaccount.is_valid(x)]
+[]
diff --git a/update/cz_banks.py b/update/cz_banks.py
new file mode 100755
index 00000000..041f3327
--- /dev/null
+++ b/update/cz_banks.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+# coding: utf-8
+
+# update/cz_banks.py - script to download Bank list from Czech National Bank
+#
+# Copyright (C) 2022 Arthur de Jong
+#
+# 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 script downloads the list of banks with bank codes as used in the
+IBAN and BIC codes as published by the Czech National Bank."""
+import csv
+import os.path
+from io import StringIO
+
+import requests
+
+
+# The location of the CSV version of the bank identification codes. Also see
+# https://www.cnb.cz/cs/platebni-styk/ucty-kody-bank/
+download_url = 'https://www.cnb.cz/cs/platebni-styk/.galleries/ucty_kody_bank/download/kody_bank_CR.csv'
+
+
+def get_values(csv_reader):
+    """Return values (bank_number, bic, bank_name, certis) from the CSV."""
+    # skip first row (header)
+    try:
+        next(csv_reader)
+    except StopIteration:
+        pass  # ignore empty CSV
+
+    for row in csv_reader:
+        yield row[0], row[2], row[1], row[3] == 'A'
+
+
+if __name__ == '__main__':
+    response = requests.get(download_url)
+    response.raise_for_status()
+    csv_reader = csv.reader(StringIO(response.content.decode('utf-8')), delimiter=';')
+    print('# generated from %s downloaded from' % os.path.basename(download_url))
+    print('# %s' % download_url)
+    for bank_number, bic, bank, certis in get_values(csv_reader):
+        info = '%s' % bank_number
+        if bic:
+            info += ' bic="%s"' % bic
+        if bank:
+            info += ' bank="%s"' % bank
+        if certis:
+            info += ' certis="%s"' % certis
+        print(info)