diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c5ffd75bd..f66a3f69b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -230,6 +230,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - `seed_everything` now fails when an invalid seed value is passed instead of selecting a random seed ([#8787](https://github.com/PyTorchLightning/pytorch-lightning/pull/8787))
 
 
+- Use a unique filename to save temp ckpt in tuner ([#96827](https://github.com/PyTorchLightning/pytorch-lightning/pull/9682))
+
+
 ### Deprecated
 
 - Deprecated `LightningModule.summarize()` in favor of `pytorch_lightning.utilities.model_summary.summarize()`
diff --git a/pytorch_lightning/tuner/batch_size_scaling.py b/pytorch_lightning/tuner/batch_size_scaling.py
index 7e1181ebdb..e2cc0aab12 100644
--- a/pytorch_lightning/tuner/batch_size_scaling.py
+++ b/pytorch_lightning/tuner/batch_size_scaling.py
@@ -13,6 +13,7 @@
 # limitations under the License
 import logging
 import os
+import uuid
 from typing import Optional, Tuple
 
 import pytorch_lightning as pl
@@ -63,7 +64,7 @@ def scale_batch_size(
     __scale_batch_reset_params(trainer, model, steps_per_trial)
 
     # Save initial model, that is loaded after batch size is found
-    save_path = os.path.join(trainer.default_root_dir, "scale_batch_size_temp_model.ckpt")
+    save_path = os.path.join(trainer.default_root_dir, f"scale_batch_size_temp_model_{uuid.uuid4()}.ckpt")
     trainer.save_checkpoint(str(save_path))
 
     if trainer.progress_bar_callback:
diff --git a/pytorch_lightning/tuner/lr_finder.py b/pytorch_lightning/tuner/lr_finder.py
index e44f316863..60e4c76418 100644
--- a/pytorch_lightning/tuner/lr_finder.py
+++ b/pytorch_lightning/tuner/lr_finder.py
@@ -14,6 +14,7 @@
 import importlib
 import logging
 import os
+import uuid
 from functools import wraps
 from typing import Callable, Optional, Sequence
 
@@ -208,7 +209,7 @@ def lr_find(
     if update_attr:
         lr_attr_name = _determine_lr_attr_name(trainer, model)
 
-    save_path = os.path.join(trainer.default_root_dir, "lr_find_temp_model.ckpt")
+    save_path = os.path.join(trainer.default_root_dir, f"lr_find_temp_model_{uuid.uuid4()}.ckpt")
 
     __lr_finder_dump_params(trainer, model)
 
diff --git a/tests/tuner/test_lr_finder.py b/tests/tuner/test_lr_finder.py
index d764afba5d..80fdf019b7 100644
--- a/tests/tuner/test_lr_finder.py
+++ b/tests/tuner/test_lr_finder.py
@@ -57,7 +57,7 @@ def test_model_reset_correctly(tmpdir):
             torch.eq(before_state_dict[key], after_state_dict[key])
         ), "Model was not reset correctly after learning rate finder"
 
-    assert not os.path.exists(tmpdir / "lr_find_temp_model.ckpt")
+    assert not any(f for f in os.listdir(tmpdir) if f.startswith("lr_find_temp_model"))
 
 
 def test_trainer_reset_correctly(tmpdir):
diff --git a/tests/tuner/test_scale_batch_size.py b/tests/tuner/test_scale_batch_size.py
index a78ef828ca..c0d60e5bd8 100644
--- a/tests/tuner/test_scale_batch_size.py
+++ b/tests/tuner/test_scale_batch_size.py
@@ -91,6 +91,8 @@ def test_model_reset_correctly(tmpdir):
             torch.eq(before_state_dict[key], after_state_dict[key])
         ), "Model was not reset correctly after scaling batch size"
 
+    assert not any(f for f in os.listdir(tmpdir) if f.startswith("scale_batch_size_temp_model"))
+
 
 def test_trainer_reset_correctly(tmpdir):
     """Check that all trainer parameters are reset correctly after scaling batch size."""