diff --git a/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.cpp
index e0808a8e4f..a8e11e443f 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.cpp
@@ -47,6 +47,11 @@ void LocalePrototype::initialize(GlobalObject& global_object)
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm, "Intl.Locale"), Attribute::Configurable);
 
     define_native_accessor(vm.names.baseName, base_name, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.calendar, calendar, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.caseFirst, case_first, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.collation, collation, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.hourCycle, hour_cycle, {}, Attribute::Configurable);
+    define_native_accessor(vm.names.numberingSystem, numbering_system, {}, Attribute::Configurable);
 }
 
 // 14.3.5 Intl.Locale.prototype.toString ( ), https://tc39.es/ecma402/#sec-Intl.Locale.prototype.toString
@@ -79,4 +84,29 @@ JS_DEFINE_NATIVE_GETTER(LocalePrototype::base_name)
     return js_string(vm, locale->language_id.to_string());
 }
 
+#define JS_ENUMERATE_LOCALE_KEYWORD_PROPERTIES \
+    __JS_ENUMERATE(calendar)                   \
+    __JS_ENUMERATE(case_first)                 \
+    __JS_ENUMERATE(collation)                  \
+    __JS_ENUMERATE(hour_cycle)                 \
+    __JS_ENUMERATE(numbering_system)
+
+// 14.3.7 get Intl.Locale.prototype.calendar, https://tc39.es/ecma402/#sec-Intl.Locale.prototype.calendar
+// 14.3.8 get Intl.Locale.prototype.caseFirst, https://tc39.es/ecma402/#sec-Intl.Locale.prototype.caseFirst
+// 14.3.9 get Intl.Locale.prototype.collation, https://tc39.es/ecma402/#sec-Intl.Locale.prototype.collation
+// 14.3.10 get Intl.Locale.prototype.hourCycle, https://tc39.es/ecma402/#sec-Intl.Locale.prototype.hourCycle
+// 14.3.12 get Intl.Locale.prototype.numberingSystem, https://tc39.es/ecma402/#sec-Intl.Locale.prototype.numberingSystem
+#define __JS_ENUMERATE(keyword)                          \
+    JS_DEFINE_NATIVE_GETTER(LocalePrototype::keyword)    \
+    {                                                    \
+        auto* locale_object = typed_this(global_object); \
+        if (!locale_object)                              \
+            return {};                                   \
+        if (!locale_object->has_##keyword())             \
+            return js_undefined();                       \
+        return js_string(vm, locale_object->keyword());  \
+    }
+JS_ENUMERATE_LOCALE_KEYWORD_PROPERTIES
+#undef __JS_ENUMERATE
+
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.h b/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.h
index b6b6b76f6e..02880cb91d 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Intl/LocalePrototype.h
@@ -22,6 +22,11 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(to_string);
 
     JS_DECLARE_NATIVE_GETTER(base_name);
+    JS_DECLARE_NATIVE_GETTER(calendar);
+    JS_DECLARE_NATIVE_GETTER(case_first);
+    JS_DECLARE_NATIVE_GETTER(collation);
+    JS_DECLARE_NATIVE_GETTER(hour_cycle);
+    JS_DECLARE_NATIVE_GETTER(numbering_system);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.calendar.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.calendar.js
new file mode 100644
index 0000000000..de372899ad
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.calendar.js
@@ -0,0 +1,16 @@
+describe("errors", () => {
+    test("called on non-Locale object", () => {
+        expect(() => {
+            Intl.Locale.prototype.calendar;
+        }).toThrowWithMessage(TypeError, "Not a Intl.Locale object");
+    });
+});
+
+describe("normal behavior", () => {
+    test("basic functionality", () => {
+        expect(new Intl.Locale("en").calendar).toBeUndefined();
+        expect(new Intl.Locale("en-u-ca-abc").calendar).toBe("abc");
+        expect(new Intl.Locale("en", { calendar: "abc" }).calendar).toBe("abc");
+        expect(new Intl.Locale("en-u-ca-abc", { calendar: "def" }).calendar).toBe("def");
+    });
+});
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.caseFirst.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.caseFirst.js
new file mode 100644
index 0000000000..852f4ea88c
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.caseFirst.js
@@ -0,0 +1,16 @@
+describe("errors", () => {
+    test("called on non-Locale object", () => {
+        expect(() => {
+            Intl.Locale.prototype.caseFirst;
+        }).toThrowWithMessage(TypeError, "Not a Intl.Locale object");
+    });
+});
+
+describe("normal behavior", () => {
+    test("basic functionality", () => {
+        expect(new Intl.Locale("en").caseFirst).toBeUndefined();
+        expect(new Intl.Locale("en-u-kf-upper").caseFirst).toBe("upper");
+        expect(new Intl.Locale("en", { caseFirst: "lower" }).caseFirst).toBe("lower");
+        expect(new Intl.Locale("en-u-kf-upper", { caseFirst: "false" }).caseFirst).toBe("false");
+    });
+});
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.collation.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.collation.js
new file mode 100644
index 0000000000..363a679ae5
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.collation.js
@@ -0,0 +1,16 @@
+describe("errors", () => {
+    test("called on non-Locale object", () => {
+        expect(() => {
+            Intl.Locale.prototype.collation;
+        }).toThrowWithMessage(TypeError, "Not a Intl.Locale object");
+    });
+});
+
+describe("normal behavior", () => {
+    test("basic functionality", () => {
+        expect(new Intl.Locale("en").collation).toBeUndefined();
+        expect(new Intl.Locale("en-u-co-abc").collation).toBe("abc");
+        expect(new Intl.Locale("en", { collation: "abc" }).collation).toBe("abc");
+        expect(new Intl.Locale("en-u-co-abc", { collation: "def" }).collation).toBe("def");
+    });
+});
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.hourCycle.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.hourCycle.js
new file mode 100644
index 0000000000..53c8e3c44f
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.hourCycle.js
@@ -0,0 +1,16 @@
+describe("errors", () => {
+    test("called on non-Locale object", () => {
+        expect(() => {
+            Intl.Locale.prototype.hourCycle;
+        }).toThrowWithMessage(TypeError, "Not a Intl.Locale object");
+    });
+});
+
+describe("normal behavior", () => {
+    test("basic functionality", () => {
+        expect(new Intl.Locale("en").hourCycle).toBeUndefined();
+        expect(new Intl.Locale("en-u-hc-h11").hourCycle).toBe("h11");
+        expect(new Intl.Locale("en", { hourCycle: "h12" }).hourCycle).toBe("h12");
+        expect(new Intl.Locale("en-u-hc-h23", { hourCycle: "h24" }).hourCycle).toBe("h24");
+    });
+});
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.numberingSystem.js b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.numberingSystem.js
new file mode 100644
index 0000000000..ff1563cbbc
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Intl/Locale/Locale.prototype.numberingSystem.js
@@ -0,0 +1,18 @@
+describe("errors", () => {
+    test("called on non-Locale object", () => {
+        expect(() => {
+            Intl.Locale.prototype.numberingSystem;
+        }).toThrowWithMessage(TypeError, "Not a Intl.Locale object");
+    });
+});
+
+describe("normal behavior", () => {
+    test("basic functionality", () => {
+        expect(new Intl.Locale("en").numberingSystem).toBeUndefined();
+        expect(new Intl.Locale("en-u-nu-abc").numberingSystem).toBe("abc");
+        expect(new Intl.Locale("en", { numberingSystem: "abc" }).numberingSystem).toBe("abc");
+        expect(new Intl.Locale("en-u-nu-abc", { numberingSystem: "def" }).numberingSystem).toBe(
+            "def"
+        );
+    });
+});