diff --git a/fmlcore/src/main/java/net/minecraftforge/fml/config/ConfigTracker.java b/fmlcore/src/main/java/net/minecraftforge/fml/config/ConfigTracker.java
index 53107720fc..02ce9623c5 100644
--- a/fmlcore/src/main/java/net/minecraftforge/fml/config/ConfigTracker.java
+++ b/fmlcore/src/main/java/net/minecraftforge/fml/config/ConfigTracker.java
@@ -66,8 +66,12 @@ public class ConfigTracker {
     private void closeConfig(final ModConfig config, final Path configBasePath) {
         if (config.getConfigData() != null) {
             LOGGER.trace(CONFIG, "Closing config file type {} at {} for {}", config.getType(), config.getFileName(), config.getModId());
-            config.save();
+            // stop the filewatcher before we save the file and close it, so reload doesn't fire
             config.getHandler().unload(configBasePath, config);
+            var unloading = IConfigEvent.unloading(config);
+            if (unloading != null)
+                config.fireEvent(unloading);
+            config.save();
             config.setConfigData(null);
         }
     }
diff --git a/fmlcore/src/main/java/net/minecraftforge/fml/config/IConfigEvent.java b/fmlcore/src/main/java/net/minecraftforge/fml/config/IConfigEvent.java
index d0b1e6a940..124010fe1c 100644
--- a/fmlcore/src/main/java/net/minecraftforge/fml/config/IConfigEvent.java
+++ b/fmlcore/src/main/java/net/minecraftforge/fml/config/IConfigEvent.java
@@ -10,8 +10,17 @@ import net.minecraftforge.fml.Bindings;
 
 import java.util.function.Function;
 
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Nullable;
+
 public interface IConfigEvent {
-    record ConfigConfig(Function<ModConfig, IConfigEvent> loading, Function<ModConfig, IConfigEvent> reloading) {}
+    record ConfigConfig(Function<ModConfig, IConfigEvent> loading, Function<ModConfig, IConfigEvent> reloading, @Nullable Function<ModConfig, IConfigEvent> unloading) {
+        @Deprecated(since = "1.19.3", forRemoval = true)
+        @ApiStatus.Internal
+        ConfigConfig(Function<ModConfig, IConfigEvent> loading, Function<ModConfig, IConfigEvent> reloading) {
+            this(loading, reloading, null);
+        }
+    }
     ConfigConfig CONFIGCONFIG = Bindings.getConfigConfiguration().get();
 
     static IConfigEvent reloading(ModConfig modConfig) {
@@ -20,6 +29,9 @@ public interface IConfigEvent {
     static IConfigEvent loading(ModConfig modConfig) {
         return CONFIGCONFIG.loading().apply(modConfig);
     }
+    @Nullable static IConfigEvent unloading(ModConfig modConfig) {
+        return CONFIGCONFIG.unloading() == null ? null : CONFIGCONFIG.unloading().apply(modConfig);
+    }
     ModConfig getConfig();
 
     @SuppressWarnings("unchecked")
diff --git a/fmlonly/src/main/java/net/minecraftforge/fmlonly/FMLOnlyBindings.java b/fmlonly/src/main/java/net/minecraftforge/fmlonly/FMLOnlyBindings.java
index 97f6c5eb22..49bf17aa08 100644
--- a/fmlonly/src/main/java/net/minecraftforge/fmlonly/FMLOnlyBindings.java
+++ b/fmlonly/src/main/java/net/minecraftforge/fmlonly/FMLOnlyBindings.java
@@ -42,6 +42,6 @@ public class FMLOnlyBindings implements IBindingsProvider {
 
     @Override
     public Supplier<IConfigEvent.ConfigConfig> getConfigConfiguration() {
-        return ()->new IConfigEvent.ConfigConfig(ModConfigEvent.Loading::new, ModConfigEvent.Reloading::new);
+        return ()->new IConfigEvent.ConfigConfig(ModConfigEvent.Loading::new, ModConfigEvent.Reloading::new, ModConfigEvent.Unloading::new);
     }
 }
diff --git a/src/fmlcommon/java/net/minecraftforge/fml/event/config/ModConfigEvent.java b/src/fmlcommon/java/net/minecraftforge/fml/event/config/ModConfigEvent.java
index 2fb64ab936..60c44855cc 100644
--- a/src/fmlcommon/java/net/minecraftforge/fml/event/config/ModConfigEvent.java
+++ b/src/fmlcommon/java/net/minecraftforge/fml/event/config/ModConfigEvent.java
@@ -22,15 +22,37 @@ public class ModConfigEvent extends Event implements IModBusEvent, IConfigEvent
         return config;
     }
 
+    /**
+     * Fired during mod and server loading, depending on {@link ModConfig.Type} of config file.
+     * Any Config objects associated with this will be valid and can be queried directly.
+     */
     public static class Loading extends ModConfigEvent {
         public Loading(final ModConfig config) {
             super(config);
         }
     }
 
+    /**
+     * Fired when the configuration is changed. This can be caused by a change to the config
+     * from a UI or from editing the file itself. IMPORTANT: this can fire at any time
+     * and may not even be on the server or client threads. Ensure you properly synchronize
+     * any resultant changes.
+     */
     public static class Reloading extends ModConfigEvent {
         public Reloading(final ModConfig config) {
             super(config);
         }
     }
+
+    /**
+     * Fired when a config is unloaded. This only happens when the server closes, which is
+     * probably only really relevant on the client, to reset internal mod state when the
+     * server goes away, though it will fire on the dedicated server as well.
+     * The config file will be saved after this event has fired.
+     */
+    public static class Unloading extends ModConfigEvent {
+        public Unloading(final ModConfig config) {
+            super(config);
+        }
+    }
 }
diff --git a/src/main/java/net/minecraftforge/internal/ForgeBindings.java b/src/main/java/net/minecraftforge/internal/ForgeBindings.java
index 197376ecc2..716ca44161 100644
--- a/src/main/java/net/minecraftforge/internal/ForgeBindings.java
+++ b/src/main/java/net/minecraftforge/internal/ForgeBindings.java
@@ -38,6 +38,6 @@ public class ForgeBindings implements IBindingsProvider {
 
     @Override
     public Supplier<IConfigEvent.ConfigConfig> getConfigConfiguration() {
-        return ()->new IConfigEvent.ConfigConfig(ModConfigEvent.Loading::new, ModConfigEvent.Reloading::new);
+        return ()->new IConfigEvent.ConfigConfig(ModConfigEvent.Loading::new, ModConfigEvent.Reloading::new, ModConfigEvent.Unloading::new);
     }
 }