diff --git a/python/PyQt6/core/auto_generated/geometry/qgsgeos.sip.in b/python/PyQt6/core/auto_generated/geometry/qgsgeos.sip.in
index 0573ff9d003a..44bb5b982328 100644
--- a/python/PyQt6/core/auto_generated/geometry/qgsgeos.sip.in
+++ b/python/PyQt6/core/auto_generated/geometry/qgsgeos.sip.in
@@ -106,6 +106,8 @@ Curved geometries are not supported.
 
     virtual QgsAbstractGeometry *buffer( double distance, int segments, Qgis::EndCapStyle endCapStyle, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = 0 ) const;
 
+
+
     virtual QgsAbstractGeometry *simplify( double tolerance, QString *errorMsg = 0 ) const;
 
     virtual QgsAbstractGeometry *interpolate( double distance, QString *errorMsg = 0 ) const;
@@ -287,6 +289,7 @@ This method requires a QGIS build based on GEOS 3.7 or later.
                                          QgsPointSequence &topologyTestPoints,
                                          QString *errorMsg = 0, bool skipIntersectionCheck = false ) const;
 
+
     virtual QgsAbstractGeometry *offsetCurve( double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = 0 ) const;
 
 
diff --git a/python/core/auto_generated/geometry/qgsgeos.sip.in b/python/core/auto_generated/geometry/qgsgeos.sip.in
index f16c23113e0e..828b656e3831 100644
--- a/python/core/auto_generated/geometry/qgsgeos.sip.in
+++ b/python/core/auto_generated/geometry/qgsgeos.sip.in
@@ -106,6 +106,8 @@ Curved geometries are not supported.
 
     virtual QgsAbstractGeometry *buffer( double distance, int segments, Qgis::EndCapStyle endCapStyle, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = 0 ) const;
 
+
+
     virtual QgsAbstractGeometry *simplify( double tolerance, QString *errorMsg = 0 ) const;
 
     virtual QgsAbstractGeometry *interpolate( double distance, QString *errorMsg = 0 ) const;
@@ -287,6 +289,7 @@ This method requires a QGIS build based on GEOS 3.7 or later.
                                          QgsPointSequence &topologyTestPoints,
                                          QString *errorMsg = 0, bool skipIntersectionCheck = false ) const;
 
+
     virtual QgsAbstractGeometry *offsetCurve( double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = 0 ) const;
 
 
diff --git a/src/core/geometry/qgsgeos.cpp b/src/core/geometry/qgsgeos.cpp
index e1f4a43f6d7b..2debede2167a 100644
--- a/src/core/geometry/qgsgeos.cpp
+++ b/src/core/geometry/qgsgeos.cpp
@@ -2094,7 +2094,13 @@ QgsAbstractGeometry *QgsGeos::buffer( double distance, int segments, QString *er
 
 QgsAbstractGeometry *QgsGeos::buffer( double distance, int segments, Qgis::EndCapStyle endCapStyle, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg ) const
 {
-  if ( !mGeos )
+  geos::unique_ptr geos = buffer( mGeos.get(), distance, segments, endCapStyle, joinStyle, miterLimit, errorMsg );
+  return fromGeos( geos.get() ).release();
+}
+
+geos::unique_ptr QgsGeos::buffer( const GEOSGeometry *geometry, double distance, int segments, Qgis::EndCapStyle endCapStyle, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg )
+{
+  if ( !geometry )
   {
     return nullptr;
   }
@@ -2102,10 +2108,10 @@ QgsAbstractGeometry *QgsGeos::buffer( double distance, int segments, Qgis::EndCa
   geos::unique_ptr geos;
   try
   {
-    geos.reset( GEOSBufferWithStyle_r( QgsGeosContext::get(), mGeos.get(), distance, segments, static_cast< int >( endCapStyle ), static_cast< int >( joinStyle ), miterLimit ) );
+    geos.reset( GEOSBufferWithStyle_r( QgsGeosContext::get(), geometry, distance, segments, static_cast< int >( endCapStyle ), static_cast< int >( joinStyle ), miterLimit ) );
   }
   CATCH_GEOS_WITH_ERRMSG( nullptr )
-  return fromGeos( geos.get() ).release();
+  return geos;
 }
 
 QgsAbstractGeometry *QgsGeos::simplify( double tolerance, QString *errorMsg ) const
@@ -2743,9 +2749,9 @@ geos::unique_ptr QgsGeos::createGeosPolygon( const QgsAbstractGeometry *poly, do
   return geosPolygon;
 }
 
-QgsAbstractGeometry *QgsGeos::offsetCurve( double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg ) const
+geos::unique_ptr QgsGeos::offsetCurve( const GEOSGeometry *geometry, double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg )
 {
-  if ( !mGeos )
+  if ( !geometry )
     return nullptr;
 
   geos::unique_ptr offset;
@@ -2755,11 +2761,19 @@ QgsAbstractGeometry *QgsGeos::offsetCurve( double distance, int segments, Qgis::
     // https://github.com/qgis/QGIS/issues/53165#issuecomment-1563470832
     if ( segments < 8 )
       segments = 8;
-    offset.reset( GEOSOffsetCurve_r( QgsGeosContext::get(), mGeos.get(), distance, segments, static_cast< int >( joinStyle ), miterLimit ) );
+    offset.reset( GEOSOffsetCurve_r( QgsGeosContext::get(), geometry, distance, segments, static_cast< int >( joinStyle ), miterLimit ) );
   }
   CATCH_GEOS_WITH_ERRMSG( nullptr )
-  std::unique_ptr< QgsAbstractGeometry > offsetGeom = fromGeos( offset.get() );
-  return offsetGeom.release();
+  return offset;
+}
+
+QgsAbstractGeometry *QgsGeos::offsetCurve( double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg ) const
+{
+  geos::unique_ptr res = offsetCurve( mGeos.get(), distance, segments, joinStyle, miterLimit, errorMsg );
+  if ( !res )
+    return nullptr;
+
+  return fromGeos( res.get() ).release();
 }
 
 std::unique_ptr<QgsAbstractGeometry> QgsGeos::singleSidedBuffer( double distance, int segments, Qgis::BufferSide side, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg ) const
diff --git a/src/core/geometry/qgsgeos.h b/src/core/geometry/qgsgeos.h
index 294167066b9d..6ace82b22d68 100644
--- a/src/core/geometry/qgsgeos.h
+++ b/src/core/geometry/qgsgeos.h
@@ -226,6 +226,15 @@ class CORE_EXPORT QgsGeos: public QgsGeometryEngine
     QgsAbstractGeometry *symDifference( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr, const QgsGeometryParameters &parameters = QgsGeometryParameters() ) const override;
     QgsAbstractGeometry *buffer( double distance, int segments, QString *errorMsg = nullptr ) const override;
     QgsAbstractGeometry *buffer( double distance, int segments, Qgis::EndCapStyle endCapStyle, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = nullptr ) const override;
+
+    /**
+     * Directly calculates the buffer for a GEOS geometry object and returns a GEOS geometry result.
+     *
+     * \note Not available in Python bindings
+     * \since QGIS 3.42
+     */
+    SIP_SKIP static geos::unique_ptr buffer( const GEOSGeometry *geometry, double distance, int segments, Qgis::EndCapStyle endCapStyle, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = nullptr );
+
     QgsAbstractGeometry *simplify( double tolerance, QString *errorMsg = nullptr ) const override;
     QgsAbstractGeometry *interpolate( double distance, QString *errorMsg = nullptr ) const override;
     QgsAbstractGeometry *envelope( QString *errorMsg = nullptr ) const override;
@@ -380,6 +389,14 @@ class CORE_EXPORT QgsGeos: public QgsGeometryEngine
                                          QgsPointSequence &topologyTestPoints,
                                          QString *errorMsg = nullptr, bool skipIntersectionCheck = false ) const override;
 
+    /**
+     * Directly calculates the offset curve for a GEOS geometry object and returns a GEOS geometry result.
+     *
+     * \note Not available in Python bindings
+     * \since QGIS 3.42
+     */
+    SIP_SKIP static geos::unique_ptr offsetCurve( const GEOSGeometry *geometry, double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = nullptr );
+
     QgsAbstractGeometry *offsetCurve( double distance, int segments, Qgis::JoinStyle joinStyle, double miterLimit, QString *errorMsg = nullptr ) const override;
 
     /**