diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48274f3ab945b..0d11cf4bdaab1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -143,6 +143,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
+- Fixed `fuse_modules` to be qat-aware for `torch>=1.11` ([#12891](https://github.com/PyTorchLightning/pytorch-lightning/pull/12891))
+
+
 - Use only a single instance of `rich.console.Console` throughout codebase ([#12886](https://github.com/PyTorchLightning/pytorch-lightning/pull/12886))
 
 
diff --git a/pytorch_lightning/callbacks/quantization.py b/pytorch_lightning/callbacks/quantization.py
index 4b0b3f702cf6e..2ae1262eb25d9 100644
--- a/pytorch_lightning/callbacks/quantization.py
+++ b/pytorch_lightning/callbacks/quantization.py
@@ -26,7 +26,7 @@
 
 import pytorch_lightning as pl
 from pytorch_lightning.callbacks.base import Callback
-from pytorch_lightning.utilities import _TORCH_GREATER_EQUAL_1_10
+from pytorch_lightning.utilities import _TORCH_GREATER_EQUAL_1_10, _TORCH_GREATER_EQUAL_1_11
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
 
 if _TORCH_GREATER_EQUAL_1_10:
@@ -34,6 +34,11 @@
 else:
     from torch.quantization import QConfig
 
+if _TORCH_GREATER_EQUAL_1_11:
+    from torch.ao.quantization import fuse_modules_qat as fuse_modules
+else:
+    from torch.quantization import fuse_modules
+
 
 def wrap_qat_forward_context(
     quant_cb, model: "pl.LightningModule", func: Callable, trigger_condition: Optional[Union[Callable, int]] = None
@@ -252,7 +257,7 @@ def _prepare_model(self, model: torch.nn.Module) -> None:
             model.qconfig = self._qconfig
 
         if self._check_feasible_fuse(model):
-            torch.quantization.fuse_modules(model, self._modules_to_fuse, inplace=True)
+            fuse_modules(model, self._modules_to_fuse, inplace=True)
 
         # Prepare the model for QAT. This inserts observers and fake_quants in
         # the model that will observe weight and activation tensors during calibration.
diff --git a/pytorch_lightning/utilities/__init__.py b/pytorch_lightning/utilities/__init__.py
index 289b7faa431e2..87947ac9a10f3 100644
--- a/pytorch_lightning/utilities/__init__.py
+++ b/pytorch_lightning/utilities/__init__.py
@@ -49,6 +49,7 @@
     _RICH_AVAILABLE,
     _TORCH_GREATER_EQUAL_1_9,
     _TORCH_GREATER_EQUAL_1_10,
+    _TORCH_GREATER_EQUAL_1_11,
     _TORCH_QUANTIZE_AVAILABLE,
     _TORCHTEXT_AVAILABLE,
     _TORCHVISION_AVAILABLE,