diff --git a/src/blenderbim/blenderbim/core/library.py b/src/blenderbim/blenderbim/core/library.py
index c1103f5bf9..6b5ce7e767 100644
--- a/src/blenderbim/blenderbim/core/library.py
+++ b/src/blenderbim/blenderbim/core/library.py
@@ -87,4 +87,4 @@ def assign_library_reference(ifc, obj=None, reference=None):
 
 
 def unassign_library_reference(ifc, obj=None, reference=None):
-    ifc.run("library.unassign_reference", product=ifc.get_entity(obj), reference=reference)
+    ifc.run("library.unassign_reference", products=[ifc.get_entity(obj)], reference=reference)
diff --git a/src/blenderbim/test/core/test_library.py b/src/blenderbim/test/core/test_library.py
index 9e4f9ffee6..4722cde5c0 100644
--- a/src/blenderbim/test/core/test_library.py
+++ b/src/blenderbim/test/core/test_library.py
@@ -121,5 +121,5 @@ class TestAssignLibraryReference:
 class TestUnassignLibraryReference:
     def test_run(self, ifc):
         ifc.get_entity("obj").should_be_called().will_return("product")
-        ifc.run("library.unassign_reference", product="product", reference="reference").should_be_called()
+        ifc.run("library.unassign_reference", products=["product"], reference="reference").should_be_called()
         subject.unassign_library_reference(ifc, obj="obj", reference="reference")
diff --git a/src/ifcopenshell-python/ifcopenshell/api/__init__.py b/src/ifcopenshell-python/ifcopenshell/api/__init__.py
index b9e60e65a6..6d27dbebfd 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/__init__.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/__init__.py
@@ -96,6 +96,9 @@ ARGUMENTS_DEPRECATION = {
     "library.assign_reference": partial(
         batching_argument_deprecation, prev_argument="product", new_argument="products"
     ),
+    "library.unassign_reference": partial(
+        batching_argument_deprecation, prev_argument="product", new_argument="products"
+    ),
 }
 
 
diff --git a/src/ifcopenshell-python/ifcopenshell/api/library/unassign_reference.py b/src/ifcopenshell-python/ifcopenshell/api/library/unassign_reference.py
index 5bd04bc581..b650ffba75 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/library/unassign_reference.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/library/unassign_reference.py
@@ -18,18 +18,24 @@
 
 import ifcopenshell
 import ifcopenshell.util.element
+import ifcopenshell.api
 
 
 class Usecase:
-    def __init__(self, file, reference=None, product=None):
-        """Unassigns a product from a reference
+    def __init__(
+        self,
+        file: ifcopenshell.file,
+        reference: ifcopenshell.entity_instance,
+        products: list[ifcopenshell.entity_instance],
+    ):
+        """Unassigns a product of products from a reference
 
         If the product isn't assigned to the reference, nothing will happen.
 
         :param reference: The IfcLibraryReference to unassign from
         :type reference: ifcopenshell.entity_instance.entity_instance
-        :param product: A IfcProduct element to unassign from the reference
-        :type product: ifcopenshell.entity_instance.entity_instance
+        :param products: A list of IfcProduct elements to unassign from the reference
+        :type products: list[ifcopenshell.entity_instance.entity_instance]
         :return: None
         :rtype: None
 
@@ -52,24 +58,33 @@ class Usecase:
             ifcopenshell.api.run("library.assign_reference", model, reference=reference, products=[ahu])
 
             # Let's change our mind and unassign it.
-            ifcopenshell.api.run("library.unassign_reference", model, reference=reference, product=ahu)
+            ifcopenshell.api.run("library.unassign_reference", model, reference=reference, products=[ahu])
         """
 
         self.file = file
-        self.settings = {"reference": reference, "product": product}
+        self.settings = {"reference": reference, "products": products}
 
     def execute(self):
-        rels = self.settings["reference"].LibraryRefForObjects
-        if not rels:
-            return
-        for rel in rels:
-            if self.settings["product"] in rel.RelatedObjects:
-                if len(rel.RelatedObjects) == 1:
-                    history = rel.OwnerHistory
-                    self.file.remove(rel)
-                    if history:
-                        ifcopenshell.util.element.remove_deep2(self.file, history)
-                    continue
-                related_objects = list(rel.RelatedObjects)
-                related_objects.remove(self.settings["product"])
-                rel.RelatedObjects = related_objects
+        # TODO: do we need to support non-ifcroot elements like we do in classification.add_reference?
+
+        reference_rels: set[ifcopenshell.entity_instance] = set()
+        products = set(self.settings["products"])
+        for product in products:
+            reference_rels.update(product.HasAssociations)
+
+        reference_rels = {
+            rel
+            for rel in reference_rels
+            if rel.is_a("IfcRelAssociatesLibrary") and rel.RelatingLibrary == self.settings["reference"]
+        }
+
+        for rel in reference_rels:
+            related_objects = set(rel.RelatedObjects) - products
+            if related_objects:
+                rel.RelatedObjects = list(related_objects)
+                ifcopenshell.api.run("owner.update_owner_history", self.file, **{"element": rel})
+            else:
+                history = rel.OwnerHistory
+                self.file.remove(rel)
+                if history:
+                    ifcopenshell.util.element.remove_deep2(self.file, history)
diff --git a/src/ifcopenshell-python/test/api/library/test_unassign_reference.py b/src/ifcopenshell-python/test/api/library/test_unassign_reference.py
index 598022cbab..8962bb686a 100644
--- a/src/ifcopenshell-python/test/api/library/test_unassign_reference.py
+++ b/src/ifcopenshell-python/test/api/library/test_unassign_reference.py
@@ -18,12 +18,20 @@
 
 import test.bootstrap
 import ifcopenshell.api
+import ifcopenshell.util.element
 
 
 class TestUnassignReference(test.bootstrap.IFC4):
     def test_unassigning_a_reference(self):
         reference = self.file.createIfcLibraryReference()
-        product = self.file.createIfcWall()
-        ifcopenshell.api.run("library.assign_reference", self.file, products=[product], reference=reference)
-        ifcopenshell.api.run("library.unassign_reference", self.file, product=product, reference=reference)
+        products = [self.file.createIfcWall() for i in range(3)]
+        ifcopenshell.api.run("library.assign_reference", self.file, products=products, reference=reference)
+        ifcopenshell.api.run("library.unassign_reference", self.file, products=products[:1], reference=reference)
+        assert ifcopenshell.util.element.get_referenced_elements(reference) == set(products[1:])
+
+        ifcopenshell.api.run("library.unassign_reference", self.file, products=products[1:], reference=reference)
+        assert ifcopenshell.util.element.get_referenced_elements(reference) == set()
         assert len(self.file.by_type("IfcRelAssociatesLibrary")) == 0
+
+class TestUnassignReferenceIFC2X3(test.bootstrap.IFC2X3, TestUnassignReference):
+    pass
diff --git a/src/ifcopenshell-python/test/api/test_api.py b/src/ifcopenshell-python/test/api/test_api.py
index ee20435b33..a652a0de0c 100644
--- a/src/ifcopenshell-python/test/api/test_api.py
+++ b/src/ifcopenshell-python/test/api/test_api.py
@@ -246,3 +246,11 @@ class TestTemporarySupportForDeprecatedAPIArguments(test.bootstrap.IFC4):
         assert reference.LibraryRefForObjects[0].RelatedObjects == (product,)
         ifcopenshell.api.run("library.assign_reference", self.file, product=product2, reference=reference)
         assert set(reference.LibraryRefForObjects[0].RelatedObjects) == set((product, product2))
+
+    @deprecation_check
+    def test_unassigning_a_reference(self):
+        reference = self.file.createIfcLibraryReference()
+        product = self.file.createIfcWall()
+        ifcopenshell.api.run("library.assign_reference", self.file, products=[product], reference=reference)
+        ifcopenshell.api.run("library.unassign_reference", self.file, product=product, reference=reference)
+        assert len(self.file.by_type("IfcRelAssociatesLibrary")) == 0