diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt
index a792db943d..57dff5b593 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt
@@ -198,6 +198,8 @@ object PreferenceKeys {
 
     const val showLibraryUpdateErrors = "show_library_update_errors"
 
+    const val categoryNumberOfItems = "display_number_of_items"
+
     const val alwaysShowChapterTransition = "always_show_chapter_transition"
 
     const val hideBottomNavOnScroll = "hide_bottom_nav_on_scroll"
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt
index c503ecbf89..2bbb5f6f99 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt
@@ -355,6 +355,8 @@ class PreferencesHelper(val context: Context) {
 
     fun unreadBadgeType() = flowPrefs.getInt("unread_badge_type", 2)
 
+    fun categoryNumberOfItems() = flowPrefs.getBoolean(Keys.categoryNumberOfItems, false)
+
     fun hideStartReadingButton() = flowPrefs.getBoolean("hide_reading_button", false)
 
     fun alwaysShowChapterTransition() = flowPrefs.getBoolean(Keys.alwaysShowChapterTransition, true)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt
index d0f5b70265..a7c890194e 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt
@@ -27,10 +27,19 @@ class LibraryCategoryAdapter(val controller: LibraryController) :
 
     val sourceManager by injectLazy<SourceManager>()
 
+    private val preferences: PreferencesHelper by injectLazy()
+
+    var showNumber = preferences.categoryNumberOfItems().get()
+
     init {
         setDisplayHeadersAtStartUp(true)
     }
 
+    /**
+     * The number of manga in each category.
+     */
+    var itemsPerCategory: Map<Int, Int> = emptyMap()
+
     /**
      * The list of manga in this category.
      */
@@ -51,6 +60,10 @@ class LibraryCategoryAdapter(val controller: LibraryController) :
         mangas = list.toList()
 
         performFilter()
+
+        itemsPerCategory = headerItems.map { header ->
+            (header as LibraryHeaderItem).catId to getSectionItemPositions(header).size
+        }.toMap()
     }
 
     /**
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
index c3e90cbf7e..f94a16c841 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
@@ -905,6 +905,13 @@ class LibraryController(
                 adapter.notifyDataSetChanged()
             }
             .launchIn(viewScope)
+        preferences.categoryNumberOfItems().asFlow()
+            .drop(1)
+            .onEach {
+                adapter.showNumber = it
+                adapter.notifyDataSetChanged()
+            }
+            .launchIn(viewScope)
     }
 
     override fun onChangeStarted(handler: ControllerChangeHandler, type: ControllerChangeType) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryHeaderHolder.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryHeaderHolder.kt
index 283791c8f6..413ec67719 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryHeaderHolder.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryHeaderHolder.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.ui.library
 
+import android.annotation.SuppressLint
 import android.app.Activity
 import android.graphics.Color
 import android.util.TypedValue
@@ -58,6 +59,7 @@ class LibraryHeaderHolder(val view: View, private val adapter: LibraryCategoryAd
         }
     }
 
+    @SuppressLint("SetTextI18n")
     fun bind(item: LibraryHeaderItem) {
         val index = adapter.headerItems.indexOf(item)
         val previousIsCollapsed =
@@ -79,8 +81,11 @@ class LibraryHeaderHolder(val view: View, private val adapter: LibraryCategoryAd
         }
         val category = item.category
 
-        if (category.isAlone && !category.isDynamic) binding.categoryTitle.text = ""
-        else binding.categoryTitle.text = category.name
+        binding.categoryTitle.text =
+            if (category.isAlone && !category.isDynamic) { "" } else { category.name } +
+            if (adapter.showNumber && !category.isHidden) {
+                " (${adapter.itemsPerCategory[item.catId]})"
+            } else { "" }
         if (category.sourceId != null) {
             val icon = adapter.sourceManager.get(category.sourceId!!)?.icon()
             icon?.setBounds(0, 0, 32.dpToPx, 32.dpToPx)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/display/LibraryCategoryView.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/display/LibraryCategoryView.kt
index 8c51f6fd5b..ba77e8e39d 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/display/LibraryCategoryView.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/display/LibraryCategoryView.kt
@@ -29,6 +29,7 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
             dynamicToBottom.bindToPreference(preferences.collapsedDynamicAtBottom()) {
                 controller?.presenter?.getLibrary()
             }
+            showNumberOfItems.bindToPreference(preferences.categoryNumberOfItems())
             val hideHopper = min(
                 2,
                 preferences.hideHopper().get().toInt() * 2 + preferences.autohideHopper().get()
diff --git a/app/src/main/res/layout/library_category_layout.xml b/app/src/main/res/layout/library_category_layout.xml
index a0b022ea8c..6a136a3f3d 100644
--- a/app/src/main/res/layout/library_category_layout.xml
+++ b/app/src/main/res/layout/library_category_layout.xml
@@ -35,6 +35,14 @@
             android:layout_marginEnd="12dp"
             android:text="@string/move_dynamic_to_bottom" />
 
+        <com.google.android.material.checkbox.MaterialCheckBox
+            android:id="@+id/show_number_of_items"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="12dp"
+            android:layout_marginEnd="12dp"
+            android:text="@string/show_number_of_items" />
+
         <eu.kanade.tachiyomi.widget.MaterialSpinnerView
             android:id="@+id/hide_hopper_spinner"
             android:layout_width="match_parent"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1f3d1259d4..5bcdfaf39e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -129,6 +129,7 @@
     <string name="no_matches_for_filters">No matches found for your current filters</string>
     <string name="show_all_categories">Show all categories</string>
     <string name="move_dynamic_to_bottom">Move collapsed dynamic categories to bottom</string>
+    <string name="show_number_of_items">Show number of items</string>
     <string name="when_grouping_by_sources_tags">When grouping library by sources, status, etc.</string>
     <string name="always_show_current_category">Always show current category</string>
     <string name="category_hopper_long_press">Category hopper long-press action</string>