diff --git a/src/class_diagram/generators/json/class_diagram_generator.cc b/src/class_diagram/generators/json/class_diagram_generator.cc
index 66966d5e..9cfad127 100644
--- a/src/class_diagram/generators/json/class_diagram_generator.cc
+++ b/src/class_diagram/generators/json/class_diagram_generator.cc
@@ -23,6 +23,14 @@
 namespace clanguml::class_diagram::model {
 using nlohmann::json;
 
+void set_module(nlohmann::json &j, const common::model::element &e)
+{
+    if (e.module()) {
+        j["module"]["name"] = e.module().value();
+        j["module"]["is_private"] = e.module_private();
+    }
+}
+
 void to_json(nlohmann::json &j, const class_element &c)
 {
     j["name"] = c.name();
@@ -94,6 +102,8 @@ void to_json(nlohmann::json &j, const class_ &c)
     j["methods"] = c.methods();
     j["bases"] = c.parents();
 
+    set_module(j, c);
+
     j["template_parameters"] = c.template_params();
 }
 
@@ -102,6 +112,8 @@ void to_json(nlohmann::json &j, const enum_ &c)
     j = dynamic_cast<const common::model::element &>(c);
     j["is_nested"] = c.is_nested();
     j["constants"] = c.constants();
+
+    set_module(j, c);
 }
 
 void to_json(nlohmann::json &j, const concept_ &c)
@@ -109,6 +121,8 @@ void to_json(nlohmann::json &j, const concept_ &c)
     j = dynamic_cast<const common::model::element &>(c);
     j["parameters"] = c.requires_parameters();
     j["statements"] = c.requires_statements();
+
+    set_module(j, c);
 }
 
 } // namespace clanguml::class_diagram::model
diff --git a/src/common/model/diagram_filter.cc b/src/common/model/diagram_filter.cc
index bd501051..2e9b81fe 100644
--- a/src/common/model/diagram_filter.cc
+++ b/src/common/model/diagram_filter.cc
@@ -568,6 +568,31 @@ tvl::value_t access_filter::match(
         [&a](const auto &access) { return a == access; });
 }
 
+module_access_filter::module_access_filter(
+    filter_t type, std::vector<module_access_t> access)
+    : filter_visitor{type}
+    , access_{std::move(access)}
+{
+}
+
+tvl::value_t module_access_filter::match(
+    const diagram & /*d*/, const element &e) const
+{
+    if (!e.module().has_value())
+        return {};
+
+    if (access_.empty())
+        return {};
+
+    return tvl::any_of(
+        access_.begin(), access_.end(), [&e](const auto &access) {
+            if (access == module_access_t::kPublic)
+                return !e.module_private();
+            else
+                return e.module_private();
+        });
+}
+
 context_filter::context_filter(
     filter_t type, std::vector<config::context_config> context)
     : filter_visitor{type}
@@ -924,6 +949,9 @@ void diagram_filter::init_filters(const config::diagram &c)
         add_inclusive_filter(std::make_unique<modules_filter>(
             filter_t::kInclusive, c.include().modules));
 
+        add_inclusive_filter(std::make_unique<module_access_filter>(
+            filter_t::kInclusive, c.include().module_access));
+
         add_inclusive_filter(std::make_unique<relationship_filter>(
             filter_t::kInclusive, c.include().relationships));
 
@@ -1037,6 +1065,9 @@ void diagram_filter::init_filters(const config::diagram &c)
         add_exclusive_filter(std::make_unique<modules_filter>(
             filter_t::kExclusive, c.exclude().modules));
 
+        add_exclusive_filter(std::make_unique<module_access_filter>(
+            filter_t::kExclusive, c.exclude().module_access));
+
         add_exclusive_filter(std::make_unique<paths_filter>(
             filter_t::kExclusive, c.root_directory(), c.exclude().paths));
 
diff --git a/src/common/model/diagram_filter.h b/src/common/model/diagram_filter.h
index 9344b27b..416411c6 100644
--- a/src/common/model/diagram_filter.h
+++ b/src/common/model/diagram_filter.h
@@ -457,6 +457,20 @@ private:
     std::vector<access_t> access_;
 };
 
+/**
+ * Match diagram elements based on module access (public or private).
+ */
+struct module_access_filter : public filter_visitor {
+    module_access_filter(filter_t type, std::vector<module_access_t> access);
+
+    ~module_access_filter() override = default;
+
+    tvl::value_t match(const diagram &d, const element &a) const override;
+
+private:
+    std::vector<module_access_t> access_;
+};
+
 /**
  * Match diagram elements which are in within a 'radius' distance relationship
  * to any of the elements specified in context.
diff --git a/src/common/model/element.h b/src/common/model/element.h
index d94ce76a..0707c246 100644
--- a/src/common/model/element.h
+++ b/src/common/model/element.h
@@ -101,6 +101,23 @@ public:
      */
     std::optional<std::string> module() const { return module_; }
 
+    /**
+     * Set whether the element is in a private module
+     *
+     * @param module C++20 module.
+     */
+    void set_module_private(const bool module_private)
+    {
+        module_private_ = module_private;
+    }
+
+    /**
+     * Check whether the element is in a private module.
+     *
+     * @return C++20 module.
+     */
+    bool module_private() const { return module_private_; }
+
     /**
      * Return elements full name.
      *
@@ -135,5 +152,6 @@ private:
     namespace_ ns_;
     namespace_ using_namespace_;
     std::optional<std::string> module_;
+    bool module_private_{false};
 };
 } // namespace clanguml::common::model
diff --git a/src/common/model/enums.cc b/src/common/model/enums.cc
index 84e352d0..8b553413 100644
--- a/src/common/model/enums.cc
+++ b/src/common/model/enums.cc
@@ -70,6 +70,19 @@ std::string to_string(access_t a)
     }
 }
 
+std::string to_string(module_access_t a)
+{
+    switch (a) {
+    case module_access_t::kPublic:
+        return "public";
+    case module_access_t::kPrivate:
+        return "private";
+    default:
+        assert(false);
+        return "";
+    }
+}
+
 std::string to_string(message_t r)
 {
     switch (r) {
diff --git a/src/common/model/enums.h b/src/common/model/enums.h
index e0810c1d..03d5236e 100644
--- a/src/common/model/enums.h
+++ b/src/common/model/enums.h
@@ -23,6 +23,7 @@ namespace clanguml::common::model {
 
 enum class diagram_t { kClass, kSequence, kPackage, kInclude };
 
+enum class module_access_t { kPublic, kPrivate };
 enum class access_t { kPublic, kProtected, kPrivate, kNone };
 
 enum class relationship_t {
@@ -77,6 +78,8 @@ std::string to_string(relationship_t r);
 
 std::string to_string(access_t r);
 
+std::string to_string(module_access_t r);
+
 std::string to_string(message_t m);
 
 std::string to_string(diagram_t r);
diff --git a/src/common/visitor/translation_unit_visitor.cc b/src/common/visitor/translation_unit_visitor.cc
index f6741758..8c4212e7 100644
--- a/src/common/visitor/translation_unit_visitor.cc
+++ b/src/common/visitor/translation_unit_visitor.cc
@@ -168,7 +168,13 @@ void translation_unit_visitor::set_owning_module(
 {
     if (const clang::Module *module = decl.getOwningModule();
         module != nullptr) {
-        element.set_module(module->Name);
+        std::string module_name = module->Name;
+        if (module->isPrivateModule()) {
+            // Clang just maps private modules names to "<private>"
+            module_name = module->getTopLevelModule()->Name;
+        }
+        element.set_module(module_name);
+        element.set_module_private(module->isPrivateModule());
     }
 }
 } // namespace clanguml::common::visitor
\ No newline at end of file
diff --git a/src/config/config.h b/src/config/config.h
index 8dc54064..22a1da17 100644
--- a/src/config/config.h
+++ b/src/config/config.h
@@ -194,6 +194,22 @@ struct filter {
      */
     std::vector<common::string_or_regex> modules;
 
+    /*! @brief Access type filter
+     *
+     * This filter allows to filter class members methods based on their access:
+     *  - public
+     *  - private
+     *
+     * Example:
+     *
+     * ```yaml
+     *   include:
+     *     module_access:
+     *       - public
+     * ```
+     */
+    std::vector<common::model::module_access_t> module_access;
+
     /*! @brief Elements filter
      *
      * Example:
@@ -245,8 +261,8 @@ struct filter {
      *
      * ```yaml
      *   include:
-     *     relationships:
-     *       - inheritance
+     *     access:
+     *       - public
      * ```
      */
     std::vector<common::model::access_t> access;
diff --git a/src/config/schema.h b/src/config/schema.h
index bf8e2ea0..4f5b9df2 100644
--- a/src/config/schema.h
+++ b/src/config/schema.h
@@ -91,6 +91,9 @@ types:
         - public
         - protected
         - private
+    module_access_filter_t: !variant
+        - public
+        - private
     method_type_filter_t: !variant
         - constructor
         - destructor
@@ -123,6 +126,7 @@ types:
         element_types: !optional [element_types_filter_t]
         relationships: !optional [relationship_filter_t]
         access: !optional [access_filter_t]
+        module_access: !optional [module_access_filter_t]
         subclasses: !optional [regex_or_string_t]
         parents: !optional [regex_or_string_t]
         specializations: !optional [regex_or_string_t]
diff --git a/src/config/yaml_decoders.cc b/src/config/yaml_decoders.cc
index 82c7c0ef..0337832f 100644
--- a/src/config/yaml_decoders.cc
+++ b/src/config/yaml_decoders.cc
@@ -29,6 +29,7 @@ namespace YAML {
 using clanguml::common::namespace_or_regex;
 using clanguml::common::string_or_regex;
 using clanguml::common::model::access_t;
+using clanguml::common::model::module_access_t;
 using clanguml::common::model::relationship_t;
 using clanguml::config::callee_type;
 using clanguml::config::class_diagram;
@@ -241,6 +242,23 @@ template <> struct convert<access_t> {
     }
 };
 
+//
+// config module_access_t decoder
+//
+template <> struct convert<module_access_t> {
+    static bool decode(const Node &node, module_access_t &rhs)
+    {
+        if (node.as<std::string>() == "public")
+            rhs = module_access_t::kPublic;
+        else if (node.as<std::string>() == "private")
+            rhs = module_access_t::kPrivate;
+        else
+            return false;
+
+        return true;
+    }
+};
+
 //
 // config method_type decoder
 //
@@ -483,6 +501,10 @@ template <> struct convert<filter> {
                 rhs.modules.push_back({ns});
         }
 
+        if (node["module_access"])
+            rhs.module_access =
+                node["module_access"].as<decltype(rhs.module_access)>();
+
         if (node["relationships"])
             rhs.relationships =
                 node["relationships"].as<decltype(rhs.relationships)>();
diff --git a/src/config/yaml_emitters.cc b/src/config/yaml_emitters.cc
index c850287b..ddf40344 100644
--- a/src/config/yaml_emitters.cc
+++ b/src/config/yaml_emitters.cc
@@ -69,6 +69,12 @@ YAML::Emitter &operator<<(YAML::Emitter &out, const access_t &a)
     return out;
 }
 
+YAML::Emitter &operator<<(YAML::Emitter &out, const module_access_t &a)
+{
+    out << to_string(a);
+    return out;
+}
+
 YAML::Emitter &operator<<(YAML::Emitter &out, const diagram_t &d)
 {
     out << to_string(d);
@@ -124,6 +130,8 @@ YAML::Emitter &operator<<(YAML::Emitter &out, const filter &f)
         out << YAML::Key << "namespaces" << YAML::Value << f.namespaces;
     if (!f.modules.empty())
         out << YAML::Key << "modules" << YAML::Value << f.modules;
+    if (!f.module_access.empty())
+        out << YAML::Key << "module_access" << YAML::Value << f.module_access;
     if (!f.access.empty())
         out << YAML::Key << "access" << YAML::Value << f.access;
     if (!f.context.empty())
diff --git a/tests/t00070/.clang-uml b/tests/t00070/.clang-uml
index 6fa20189..8a9971a6 100644
--- a/tests/t00070/.clang-uml
+++ b/tests/t00070/.clang-uml
@@ -9,4 +9,6 @@ diagrams:
     exclude:
       modules:
         - t00070.lib2
+      module_access:
+        - private
     using_namespace: clanguml::t00070
\ No newline at end of file
diff --git a/tests/t00070/src/lib1.cppm b/tests/t00070/src/lib1.cppm
index 102c0aa7..4b0530bf 100644
--- a/tests/t00070/src/lib1.cppm
+++ b/tests/t00070/src/lib1.cppm
@@ -8,4 +8,9 @@ template <typename T> class BB {
 };
 
 enum class BBB { bbb1, bbb2 };
+}
+
+module :private;
+namespace clanguml::t00070 {
+class BBBB { };
 }
\ No newline at end of file
diff --git a/tests/t00070/t00070.cc b/tests/t00070/t00070.cc
index 8d1b6420..4035efce 100644
--- a/tests/t00070/t00070.cc
+++ b/tests/t00070/t00070.cc
@@ -1,3 +1,4 @@
+import t00070;
 import t00070.lib1;
 import t00070.lib2;
 
diff --git a/tests/t00070/test_case.h b/tests/t00070/test_case.h
index fff287a3..b7e74754 100644
--- a/tests/t00070/test_case.h
+++ b/tests/t00070/test_case.h
@@ -35,7 +35,7 @@ TEST_CASE("t00070", "[test-case][class]")
         REQUIRE_THAT(src, StartsWith("@startuml"));
         REQUIRE_THAT(src, EndsWith("@enduml\n"));
 
-        REQUIRE_THAT(src, !IsClass(_A("A")));
+        REQUIRE_THAT(src, IsClass(_A("A")));
         REQUIRE_THAT(src, IsClass(_A("B")));
         REQUIRE_THAT(src, !IsClass(_A("C")));
 
@@ -43,6 +43,7 @@ TEST_CASE("t00070", "[test-case][class]")
         REQUIRE_THAT(src, !IsClassTemplate("CC", "T"));
 
         REQUIRE_THAT(src, IsEnum(_A("BBB")));
+        REQUIRE_THAT(src, !IsClass(_A("BBBB")));
         REQUIRE_THAT(src, !IsEnum(_A("CCC")));
 
         save_puml(config.output_directory(), diagram->name + ".puml", src);
@@ -53,6 +54,15 @@ TEST_CASE("t00070", "[test-case][class]")
 
         using namespace json;
 
+        REQUIRE(IsClass(j, "A"));
+        REQUIRE(IsClass(j, "B"));
+        REQUIRE(!IsClass(j, "C"));
+
+        REQUIRE(InPublicModule(j, "A", "t00070"));
+        REQUIRE(InPublicModule(j, "B", "t00070.lib1"));
+
+        REQUIRE(!IsClass(j, "BBBB"));
+
         save_json(config.output_directory(), diagram->name + ".json", j);
     }
 
@@ -63,7 +73,7 @@ TEST_CASE("t00070", "[test-case][class]")
         using mermaid::IsClass;
         using mermaid::IsEnum;
 
-        REQUIRE_THAT(src, !IsClass(_A("A")));
+        REQUIRE_THAT(src, IsClass(_A("A")));
         REQUIRE_THAT(src, IsClass(_A("B")));
         REQUIRE_THAT(src, !IsClass(_A("C")));
 
@@ -71,6 +81,7 @@ TEST_CASE("t00070", "[test-case][class]")
         REQUIRE_THAT(src, !IsClass(_A("CC<T>")));
 
         REQUIRE_THAT(src, IsEnum(_A("BBB")));
+        REQUIRE_THAT(src, !IsClass(_A("BBBB")));
         REQUIRE_THAT(src, !IsEnum(_A("CCC")));
 
         save_mermaid(config.output_directory(), diagram->name + ".mmd", src);
diff --git a/tests/test_cases.h b/tests/test_cases.h
index bf4e9249..0c9860ee 100644
--- a/tests/test_cases.h
+++ b/tests/test_cases.h
@@ -1278,6 +1278,22 @@ bool IsClass(const nlohmann::json &j, const std::string &name)
     return e && e->at("type") == "class";
 }
 
+bool InPublicModule(const nlohmann::json &j, const std::string &element,
+    const std::string &module)
+{
+    auto e = get_element(j, expand_name(j, element));
+    return e && e->contains("module") && e->at("module")["name"] == module &&
+        !e->at("module")["is_private"];
+}
+
+bool InPrivateModule(const nlohmann::json &j, const std::string &element,
+    const std::string &module)
+{
+    auto e = get_element(j, expand_name(j, element));
+    return e && e->contains("module") && e->at("module")["name"] == module &&
+        e->at("module")["is_private"];
+}
+
 bool IsAbstractClass(const nlohmann::json &j, const std::string &name)
 {
     auto e = get_element(j, expand_name(j, name));