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diff --git a/include/iprt/locale.h b/include/iprt/locale.h
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+/** @file
+ * IPRT - Locale and Related Info.
+ */
+
+/*
+ * Copyright (C) 2017-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_locale_h
+#define IPRT_INCLUDED_locale_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_rt_locale RTLocale - Locale and Related Info
+ * @ingroup grp_rt
+ * @{
+ */
+
+/**
+ * Returns the setlocale(LC_ALL,NULL) return value.
+ *
+ * @returns IPRT status code.
+ * @retval  VERR_NOT_SUPPORTED if not supported.
+ * @param   pszName         Where to return the name.
+ * @param   cbName          The size of the name buffer.
+ */
+RTDECL(int) RTLocaleQueryLocaleName(char *pszName, size_t cbName);
+
+/**
+ * Returns a normalized base locale name ('{ll}_{CC}' or 'C').
+ *
+ * @returns IPRT status code.
+ * @retval  VERR_NOT_SUPPORTED if not supported.
+ * @param   pszName         Where to return the name.
+ * @param   cbName          The size of the name buffer.
+ *
+ * @sa      RTLOCALE_IS_LANGUAGE2_UNDERSCORE_COUNTRY2
+ */
+RTDECL(int) RTLocaleQueryNormalizedBaseLocaleName(char *pszName, size_t cbName);
+
+/**
+ * Gets the two letter country code (ISO 3166-1 alpha-2) for the current user.
+ *
+ * This is not necessarily the country from the locale name, when possible the
+ * source is a different setting (host specific).
+ *
+ * @returns IPRT status code.
+ * @retval  VERR_NOT_SUPPORTED if not supported.
+ * @param   pszCountryCode  Pointer buffer that's at least three bytes in size.
+ *                          The country code will be returned here on success.
+ */
+RTDECL(int) RTLocaleQueryUserCountryCode(char pszCountryCode[3]);
+
+
+/**
+ * Checks whether @a a_psz seems to start with a
+ * language-code-underscore-country-code sequence.
+ *
+ * We perform a check for a likely ISO 639-1 language code, followed by an
+ * underscore, followed by a likely ISO 3166-1 alpha-2 country code.
+ *
+ * @return true if probable '{ll}_{CC}' sequence, false if surely not.
+ * @param  a_psz        The string to test the start of.
+ *
+ * @note User must include iprt/ctype.h separately.
+ */
+#define RTLOCALE_IS_LANGUAGE2_UNDERSCORE_COUNTRY2(a_psz) \
+    (   RT_C_IS_LOWER((a_psz)[0]) \
+     && RT_C_IS_LOWER((a_psz)[1]) \
+     && (a_psz)[2] == '_' \
+     && RT_C_IS_UPPER((a_psz)[3]) \
+     && RT_C_IS_UPPER((a_psz)[4]) )
+
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !IPRT_INCLUDED_locale_h */
+