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diff --git a/include/i18nlangtag/languagetagicu.hxx b/include/i18nlangtag/languagetagicu.hxx
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+++ b/include/i18nlangtag/languagetagicu.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_I18NLANGTAG_LANGUAGETAGICU_HXX
+#define INCLUDED_I18NLANGTAG_LANGUAGETAGICU_HXX
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <i18nlangtag/i18nlangtagdllapi.h>
+#include <rtl/ustring.hxx>
+#include <unicode/locid.h>
+
+class LanguageTag;
+
+
+/** Interface LanguageTag to ICU's icu::Locale
+
+    Separated from LanguageTag to not pollute the entire code base (and thus
+    makefiles) with ICU header file inclusion, only the few code actually using
+    this needs to know about ICU, which it did anyway.
+*/
+class SAL_WARN_UNUSED I18NLANGTAG_DLLPUBLIC LanguageTagIcu
+{
+public:
+
+    /** Obtain language tag as ICU icu::Locale.
+
+        If the language tag is a "pure" ISO locale (see
+        LanguageTag::getLocale()) that is directly constructed, otherwise it is
+        converted using the available ICU mechanisms.
+
+        Always resolves an empty tag to the system locale.
+     */
+    static  icu::Locale     getIcuLocale( const LanguageTag & rLanguageTag );
+
+    /** Obtain language tag as ICU icu::Locale, adding variant data.
+
+        From the LanguageTag only language and country are used to construct
+        the icu:Locale, the variant field is copied from rVariant.
+        The 4th arg of icu::Locale "keywords" (eg: for collation)
+
+        Always resolves an empty tag to the system locale.
+     */
+    static  icu::Locale     getIcuLocale( const LanguageTag & rLanguageTag, std::u16string_view rVariant, std::u16string_view rKeywords);
+
+    /** Obtain the display name for a language tag.
+
+        Gets a localized name from icu::Locale::getDisplayName(). Meant to be
+        used only with language tags that do not have a language list entry in
+        svtools/inc/langtab.hrc STR_ARR_SVT_LANGUAGE_TABLE, thus used by
+        SvtLanguageTable::GetLanguageString()
+
+        @param  rLanguageTag
+                The language tag for which the name is to be displayed.
+
+        @param  rDisplayLanguage
+                The language in which the name is to be displayed.
+                Usually Application::GetSettings().GetUILanguageTag().
+     */
+    static  OUString        getDisplayName( const LanguageTag & rLanguageTag, const LanguageTag & rDisplayLanguage );
+};
+
+#endif  // INCLUDED_I18NLANGTAG_LANGUAGETAGICU_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */