diff --git a/fabric-rendering-v1/src/client/java/net/fabricmc/fabric/api/client/rendering/v1/BuiltInBlockModelsCallback.java b/fabric-rendering-v1/src/client/java/net/fabricmc/fabric/api/client/rendering/v1/BuiltInBlockModelsCallback.java
new file mode 100644
index 0000000000..165d454bd2
--- /dev/null
+++ b/fabric-rendering-v1/src/client/java/net/fabricmc/fabric/api/client/rendering/v1/BuiltInBlockModelsCallback.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.api.client.rendering.v1;
+
+import net.minecraft.client.color.block.BlockColors;
+import net.minecraft.client.renderer.block.BuiltInBlockModels;
+import net.minecraft.client.renderer.block.model.BlockModel;
+
+import net.fabricmc.fabric.api.event.Event;
+import net.fabricmc.fabric.api.event.EventFactory;
+
+/**
+ * Called when custom {@link BlockModel.Unbaked BlockModels} are registered in
+ * {@link BuiltInBlockModels#createBlockModels(BlockColors)}.
+ *
+ *
This allows for overriding block models which eventually end up being used in
+ * {@link net.minecraft.client.renderer.block.BlockModelResolver}.
+ */
+public interface BuiltInBlockModelsCallback {
+ Event EVENT = EventFactory.createArrayBacked(
+ BuiltInBlockModelsCallback.class,
+ listeners -> builder -> {
+ for (BuiltInBlockModelsCallback listener : listeners) {
+ listener.createBlockModels(builder);
+ }
+ });
+
+ /**
+ * @param builder the block models builder instance
+ */
+ void createBlockModels(BuiltInBlockModels.Builder builder);
+}
diff --git a/fabric-rendering-v1/src/client/java/net/fabricmc/fabric/mixin/client/rendering/BuiltInBlockModelsMixin.java b/fabric-rendering-v1/src/client/java/net/fabricmc/fabric/mixin/client/rendering/BuiltInBlockModelsMixin.java
new file mode 100644
index 0000000000..77d9108390
--- /dev/null
+++ b/fabric-rendering-v1/src/client/java/net/fabricmc/fabric/mixin/client/rendering/BuiltInBlockModelsMixin.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.mixin.client.rendering;
+
+import java.util.Map;
+
+import com.llamalad7.mixinextras.sugar.Local;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import net.minecraft.client.renderer.block.BuiltInBlockModels;
+import net.minecraft.client.renderer.block.model.BlockModel;
+import net.minecraft.world.level.block.state.BlockState;
+
+import net.fabricmc.fabric.api.client.rendering.v1.BuiltInBlockModelsCallback;
+
+@Mixin(BuiltInBlockModels.class)
+abstract class BuiltInBlockModelsMixin {
+ @Inject(method = "createBlockModels",
+ at = @At(value = "INVOKE",
+ target = "Lnet/minecraft/client/renderer/block/BuiltInBlockModels$Builder;build()Ljava/util/Map;"))
+ private static void createBlockModels(CallbackInfoReturnable