diff --git a/common/src/main/java/dev/architectury/registry/level/entity/SpawnPlacementsRegistry.java b/common/src/main/java/dev/architectury/registry/level/entity/SpawnPlacementsRegistry.java
new file mode 100644
index 00000000..386e9ffb
--- /dev/null
+++ b/common/src/main/java/dev/architectury/registry/level/entity/SpawnPlacementsRegistry.java
@@ -0,0 +1,44 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021, 2022 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package dev.architectury.registry.level.entity;
+
+import dev.architectury.injectables.annotations.ExpectPlatform;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.Mob;
+import net.minecraft.world.entity.SpawnPlacements;
+import net.minecraft.world.level.levelgen.Heightmap;
+
+import java.util.function.Supplier;
+
+public final class SpawnPlacementsRegistry {
+    /**
+     * Registers the spawn placement of an entity.
+     *
+     * @param type           the type of entity
+     * @param spawnPlacement the type of spawn placement
+     * @param heightmapType  the type of heightmap
+     * @param spawnPredicate the spawn predicate
+     * @see net.minecraft.world.entity.SpawnPlacements
+     */
+    @ExpectPlatform
+    public static <T extends Mob> void register(Supplier<? extends EntityType<T>> type, SpawnPlacements.Type spawnPlacement, Heightmap.Types heightmapType, SpawnPlacements.SpawnPredicate<T> spawnPredicate) {
+        throw new AssertionError();
+    }
+}
diff --git a/fabric/src/main/java/dev/architectury/registry/level/entity/fabric/SpawnPlacementsRegistryImpl.java b/fabric/src/main/java/dev/architectury/registry/level/entity/fabric/SpawnPlacementsRegistryImpl.java
new file mode 100644
index 00000000..962efd22
--- /dev/null
+++ b/fabric/src/main/java/dev/architectury/registry/level/entity/fabric/SpawnPlacementsRegistryImpl.java
@@ -0,0 +1,33 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021, 2022 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package dev.architectury.registry.level.entity.fabric;
+
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.Mob;
+import net.minecraft.world.entity.SpawnPlacements;
+import net.minecraft.world.level.levelgen.Heightmap;
+
+import java.util.function.Supplier;
+
+public class SpawnPlacementsRegistryImpl {
+    public static <T extends Mob> void register(Supplier<? extends EntityType<T>> type, SpawnPlacements.Type spawnPlacement, Heightmap.Types heightmapType, SpawnPlacements.SpawnPredicate<T> spawnPredicate) {
+        SpawnPlacements.register(type.get(), spawnPlacement, heightmapType, spawnPredicate);
+    }
+}
diff --git a/forge/src/main/java/dev/architectury/registry/level/entity/forge/SpawnPlacementsRegistryImpl.java b/forge/src/main/java/dev/architectury/registry/level/entity/forge/SpawnPlacementsRegistryImpl.java
new file mode 100644
index 00000000..63afd118
--- /dev/null
+++ b/forge/src/main/java/dev/architectury/registry/level/entity/forge/SpawnPlacementsRegistryImpl.java
@@ -0,0 +1,60 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021, 2022 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package dev.architectury.registry.level.entity.forge;
+
+import dev.architectury.platform.forge.EventBuses;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.Mob;
+import net.minecraft.world.entity.SpawnPlacements;
+import net.minecraft.world.level.levelgen.Heightmap;
+import net.minecraftforge.event.entity.SpawnPlacementRegisterEvent;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
+
+public class SpawnPlacementsRegistryImpl {
+    private static List<Entry<?>> entries = new ArrayList<>();
+    
+    private record Entry<T extends Mob>(Supplier<? extends EntityType<T>> type, SpawnPlacements.Type spawnPlacement,
+                                        Heightmap.Types heightmapType,
+                                        SpawnPlacements.SpawnPredicate<T> spawnPredicate) {
+    }
+    
+    static {
+        EventBuses.onRegistered("architectury", bus -> {
+            bus.<SpawnPlacementRegisterEvent>addListener(event -> {
+                for (Entry<?> entry : entries) {
+                    Entry<Mob> casted = (Entry<Mob>) entry;
+                    event.register(casted.type().get(), casted.spawnPlacement(), casted.heightmapType(), casted.spawnPredicate(), SpawnPlacementRegisterEvent.Operation.OR);
+                }
+                entries = null;
+            });
+        });
+    }
+    
+    public static <T extends Mob> void register(Supplier<? extends EntityType<T>> type, SpawnPlacements.Type spawnPlacement, Heightmap.Types heightmapType, SpawnPlacements.SpawnPredicate<T> spawnPredicate) {
+        if (entries != null) {
+            entries.add(new Entry<>(type, spawnPlacement, heightmapType, spawnPredicate));
+        } else {
+            throw new IllegalStateException("SpawnPlacementsRegistry.register must not be called after the registry has been collected!");
+        }
+    }
+}