diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 134ec33831..5257d616c4 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -118,6 +118,7 @@ common:
   disable-animated-mfm: "投稿内の動きのあるテキストを無効にする"
   always-show-nsfw: "常に閲覧注意のメディアを表示する"
   always-mark-nsfw: "常にメディアを閲覧注意として投稿"
+  show-full-acct: "ユーザー名のホストを省略しない"
   this-setting-is-this-device-only: "このデバイスのみ"
 
   do-not-use-in-production: 'これは開発ビルドです。本番環境で使用しないでください。'
diff --git a/src/client/app/common/views/components/acct.vue b/src/client/app/common/views/components/acct.vue
index bd7833f1a9..542fbb4296 100644
--- a/src/client/app/common/views/components/acct.vue
+++ b/src/client/app/common/views/components/acct.vue
@@ -1,7 +1,7 @@
 <template>
 <span class="mk-acct">
 	<span class="name">@{{ user.username }}</span>
-	<span class="host" :class="{ fade: $store.state.settings.contrastedAcct }" v-if="user.host || detail">@{{ user.host || host }}</span>
+	<span class="host" :class="{ fade: $store.state.settings.contrastedAcct }" v-if="user.host || detail || $store.state.settings.showFullAcct">@{{ user.host || host }}</span>
 </span>
 </template>
 
diff --git a/src/client/app/desktop/views/components/settings.vue b/src/client/app/desktop/views/components/settings.vue
index 8e2905e73b..1973acc839 100644
--- a/src/client/app/desktop/views/components/settings.vue
+++ b/src/client/app/desktop/views/components/settings.vue
@@ -61,6 +61,7 @@
 				<mk-switch v-model="darkmode" text="%i18n:@dark-mode%"/>
 				<mk-switch v-model="circleIcons" text="%i18n:@circle-icons%"/>
 				<mk-switch v-model="contrastedAcct" text="%i18n:@contrasted-acct%"/>
+				<mk-switch v-model="showFullAcct" text="%i18n:common.show-full-acct%"/>
 				<mk-switch v-model="gradientWindowHeader" text="%i18n:@gradient-window-header%"/>
 				<mk-switch v-model="iLikeSushi" text="%i18n:common.i-like-sushi%"/>
 			</div>
@@ -366,6 +367,11 @@ export default Vue.extend({
 			set(value) { this.$store.dispatch('settings/set', { key: 'contrastedAcct', value }); }
 		},
 
+		showFullAcct: {
+			get() { return this.$store.state.settings.showFullAcct; },
+			set(value) { this.$store.dispatch('settings/set', { key: 'showFullAcct', value }); }
+		},
+
 		iLikeSushi: {
 			get() { return this.$store.state.settings.iLikeSushi; },
 			set(value) { this.$store.dispatch('settings/set', { key: 'iLikeSushi', value }); }
diff --git a/src/client/app/mobile/views/pages/settings.vue b/src/client/app/mobile/views/pages/settings.vue
index c93b3a50f1..9b0e521a4f 100644
--- a/src/client/app/mobile/views/pages/settings.vue
+++ b/src/client/app/mobile/views/pages/settings.vue
@@ -14,6 +14,7 @@
 					<ui-switch v-model="darkmode">%i18n:@dark-mode%</ui-switch>
 					<ui-switch v-model="circleIcons">%i18n:@circle-icons%</ui-switch>
 					<ui-switch v-model="contrastedAcct">%i18n:@contrasted-acct%</ui-switch>
+					<ui-switch v-model="showFullAcct">%i18n:common.show-full-acct%</ui-switch>
 					<ui-switch v-model="iLikeSushi">%i18n:common.i-like-sushi%</ui-switch>
 					<ui-switch v-model="disableAnimatedMfm">%i18n:common.disable-animated-mfm%</ui-switch>
 					<ui-switch v-model="alwaysShowNsfw">%i18n:common.always-show-nsfw% (%i18n:common.this-setting-is-this-device-only%)</ui-switch>
@@ -232,6 +233,11 @@ export default Vue.extend({
 			set(value) { this.$store.dispatch('settings/set', { key: 'contrastedAcct', value }); }
 		},
 
+		showFullAcct: {
+			get() { return this.$store.state.settings.showFullAcct; },
+			set(value) { this.$store.dispatch('settings/set', { key: 'showFullAcct', value }); }
+		},
+
 		iLikeSushi: {
 			get() { return this.$store.state.settings.iLikeSushi; },
 			set(value) { this.$store.dispatch('settings/set', { key: 'iLikeSushi', value }); }
diff --git a/src/client/app/store.ts b/src/client/app/store.ts
index 7a5b3e986b..997bddc5cc 100644
--- a/src/client/app/store.ts
+++ b/src/client/app/store.ts
@@ -17,6 +17,7 @@ const defaultSettings = {
 	showClockOnHeader: true,
 	circleIcons: true,
 	contrastedAcct: true,
+	showFullAcct: false,
 	gradientWindowHeader: false,
 	showReplyTarget: true,
 	showMyRenotes: true,