diff --git a/services/blob/src/s3.rs b/services/blob/src/s3.rs
--- a/services/blob/src/s3.rs
+++ b/services/blob/src/s3.rs
@@ -1,7 +1,7 @@
 use aws_sdk_s3::{
   operation::create_multipart_upload::CreateMultipartUploadOutput,
   primitives::ByteStream,
-  types::{CompletedMultipartUpload, CompletedPart},
+  types::{CompletedMultipartUpload, CompletedPart, Delete, ObjectIdentifier},
   Error as S3Error,
 };
 use std::ops::{Bound, RangeBounds};
@@ -197,6 +197,33 @@
 
     Ok(())
   }
+
+  pub async fn batch_delete_objects(&self, paths: Vec<S3Path>) -> S3Result<()> {
+    let Some(first_path) = paths.first() else {
+      debug!("No S3 objects to delete");
+      return Ok(());
+    };
+
+    let bucket_name = &first_path.bucket_name;
+    let objects = paths
+      .iter()
+      .map(|path| ObjectIdentifier::builder().key(&path.object_name).build())
+      .collect();
+
+    self
+      .client
+      .delete_objects()
+      .bucket(bucket_name)
+      .delete(Delete::builder().set_objects(Some(objects)).build())
+      .send()
+      .await
+      .map_err(|e| {
+        error!("S3 failed to batch delete objects");
+        Error::AwsSdk(e.into())
+      })?;
+
+    Ok(())
+  }
 }
 
 /// Represents a multipart upload session to the AWS S3
diff --git a/services/blob/src/service.rs b/services/blob/src/service.rs
--- a/services/blob/src/service.rs
+++ b/services/blob/src/service.rs
@@ -11,6 +11,7 @@
 use tonic::codegen::futures_core::Stream;
 use tracing::{debug, error, trace, warn};
 
+use crate::config::CONFIG;
 use crate::constants::S3_MULTIPART_UPLOAD_MINIMUM_CHUNK_SIZE;
 use crate::database::types::{
   BlobItemInput, BlobItemRow, PrimaryKey, UncheckedKind,
@@ -295,15 +296,25 @@
     unchecked_items.feed_with_query_results(fetch_results);
     checked.extend(unchecked_items.filter_out_checked());
 
-    // 7. Make changes to database
+    // 7. Perform actual cleanup
     orphans.extend(unchecked_items.into_primary_keys());
+    let s3_paths: Vec<S3Path> = orphans
+      .iter()
+      .filter(|pk| pk.is_blob_item())
+      .map(|PrimaryKey { blob_hash, .. }| S3Path {
+        bucket_name: CONFIG.s3_bucket_name.clone(),
+        object_name: blob_hash.to_string(),
+      })
+      .collect();
 
+    // 7a. Make changes to database
     tokio::try_join!(
       self.db.batch_delete_rows(orphans),
       self.db.batch_mark_checked(checked)
     )?;
 
-    // TODO: Delete orphaned blobs from S3
+    // 7b. Delete orphaned blobs from S3
+    self.s3.batch_delete_objects(s3_paths).await?;
 
     Ok(())
   }