diff --git a/modelopt/torch/quantization/nn/modules/quant_batchnorm.py b/modelopt/torch/quantization/nn/modules/quant_batchnorm.py
index 21eed5b82e0..2f07547566b 100644
--- a/modelopt/torch/quantization/nn/modules/quant_batchnorm.py
+++ b/modelopt/torch/quantization/nn/modules/quant_batchnorm.py
@@ -22,3 +22,4 @@
 QuantModuleRegistry.register({nn.BatchNorm1d: "nn.BatchNorm1d"})(QuantInputBase)
 QuantModuleRegistry.register({nn.BatchNorm2d: "nn.BatchNorm2d"})(QuantInputBase)
 QuantModuleRegistry.register({nn.BatchNorm3d: "nn.BatchNorm3d"})(QuantInputBase)
+QuantModuleRegistry.register({nn.SyncBatchNorm: "nn.SyncBatchNorm"})(QuantInputBase)
diff --git a/modelopt_recipes/configs/ptq/units/default_disabled_quantizers.yaml b/modelopt_recipes/configs/ptq/units/default_disabled_quantizers.yaml
index 1508f942776..a527e720b75 100644
--- a/modelopt_recipes/configs/ptq/units/default_disabled_quantizers.yaml
+++ b/modelopt_recipes/configs/ptq/units/default_disabled_quantizers.yaml
@@ -45,6 +45,9 @@
   - parent_class: 'nn.BatchNorm3d'
     quantizer_name: '*'
     enable: false
+  - parent_class: 'nn.SyncBatchNorm'
+    quantizer_name: '*'
+    enable: false
   - parent_class: 'nn.LeakyReLU'
     quantizer_name: '*'
     enable: false
diff --git a/modelopt_recipes/models/Step3.5-Flash/nvfp4-mlp-only.yaml b/modelopt_recipes/models/Step3.5-Flash/nvfp4-mlp-only.yaml
index c00aff7d44f..ea3af913cd9 100644
--- a/modelopt_recipes/models/Step3.5-Flash/nvfp4-mlp-only.yaml
+++ b/modelopt_recipes/models/Step3.5-Flash/nvfp4-mlp-only.yaml
@@ -84,6 +84,9 @@ quantize:
     - parent_class: 'nn.BatchNorm3d'
       quantizer_name: '*'
       enable: false
+    - parent_class: 'nn.SyncBatchNorm'
+      quantizer_name: '*'
+      enable: false
     - parent_class: 'nn.LeakyReLU'
       quantizer_name: '*'
       enable: false
diff --git a/tests/unit/torch/quantization/test_quant_batchnorm.py b/tests/unit/torch/quantization/test_quant_batchnorm.py
index c55b4b0b0e4..ef9bdd87222 100644
--- a/tests/unit/torch/quantization/test_quant_batchnorm.py
+++ b/tests/unit/torch/quantization/test_quant_batchnorm.py
@@ -34,6 +34,7 @@ class TestQuantBatchNormND:
             (nn.BatchNorm1d, (2, NUM_CHANNELS, 8)),
             (nn.BatchNorm2d, (2, NUM_CHANNELS, 8, 8)),
             (nn.BatchNorm3d, (2, NUM_CHANNELS, 8, 8, 8)),
+            (nn.SyncBatchNorm, (2, NUM_CHANNELS, 8, 8)),
         ],
     )
     def test_no_quant(self, original_cls, input_shape):
@@ -60,6 +61,7 @@ def test_no_quant(self, original_cls, input_shape):
             (nn.BatchNorm1d, (2, NUM_CHANNELS, 8)),
             (nn.BatchNorm2d, (2, NUM_CHANNELS, 8, 8)),
             (nn.BatchNorm3d, (2, NUM_CHANNELS, 8, 8, 8)),
+            (nn.SyncBatchNorm, (2, NUM_CHANNELS, 8, 8)),
         ],
     )
     def test_fake_quant_per_tensor(self, original_cls, input_shape):
@@ -86,6 +88,7 @@ def test_fake_quant_per_tensor(self, original_cls, input_shape):
             (nn.BatchNorm1d, (2, NUM_CHANNELS, 8)),
             (nn.BatchNorm2d, (2, NUM_CHANNELS, 8, 8)),
             (nn.BatchNorm3d, (2, NUM_CHANNELS, 8, 8, 8)),
+            (nn.SyncBatchNorm, (2, NUM_CHANNELS, 8, 8)),
         ],
     )
     def test_fake_quant_per_channel(self, original_cls, input_shape):