diff --git a/paper-api/src/main/java/io/papermc/paper/event/entity/EntityInsideBlockEvent.java b/paper-api/src/main/java/io/papermc/paper/event/entity/EntityInsideBlockEvent.java
new file mode 100644
index 000000000..a1a7a0af2
--- /dev/null
+++ b/paper-api/src/main/java/io/papermc/paper/event/entity/EntityInsideBlockEvent.java
@@ -0,0 +1,86 @@
+package io.papermc.paper.event.entity;
+
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when an entity enters the hitbox of a block.
+ * Only called for blocks that react when an entity is inside.
+ * If cancelled, any action that would have resulted from that entity
+ * being in the block will not happen (such as extinguishing an entity in a cauldron).
+ * <p>
+ * Blocks this is currently called for:
+ * <ul>
+ *     <li>Big dripleaf</li>
+ *     <li>Bubble column</li>
+ *     <li>Buttons</li>
+ *     <li>Cactus</li>
+ *     <li>Campfire</li>
+ *     <li>Cauldron</li>
+ *     <li>Crops</li>
+ *     <li>End Gateway</li>
+ *     <li>Ender Portal</li>
+ *     <li>Eye blossom</li>
+ *     <li>Fires</li>
+ *     <li>Frogspawn</li>
+ *     <li>Honey</li>
+ *     <li>Hopper</li>
+ *     <li>Detector rails</li>
+ *     <li>Nether portals</li>
+ *     <li>Pitcher crop</li>
+ *     <li>Powdered snow</li>
+ *     <li>Pressure plates</li>
+ *     <li>Sweet berry bush</li>
+ *     <li>Tripwire</li>
+ *     <li>Waterlily</li>
+ *     <li>Web</li>
+ *     <li>Wither rose</li>
+ * </ul>
+ */
+@NullMarked
+public class EntityInsideBlockEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Block block;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public EntityInsideBlockEvent(final Entity entity, final Block block) {
+        super(entity);
+        this.block = block;
+    }
+
+    /**
+     * Gets the block.
+     *
+     * @return the block
+     */
+    public Block getBlock() {
+        return this.block;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}