diff --git a/src/App/Link.cpp b/src/App/Link.cpp
index 1fbaed54fe..0f0649b767 100644
--- a/src/App/Link.cpp
+++ b/src/App/Link.cpp
@@ -2671,7 +2671,7 @@ Base::Placement Link::getPlacementOf(const std::string& sub, DocumentObject* tar
         }
 
         std::vector<Base::Placement> plcs = PlacementList.getValues();
-        if (plcs.size() <= i) {
+        if (plcs.size() <= static_cast<size_t>(i)) {
             return plc;
         }
         plc = plc * plcs[i];
diff --git a/src/App/Services.cpp b/src/App/Services.cpp
index 4b021529df..47f9aac0bc 100644
--- a/src/App/Services.cpp
+++ b/src/App/Services.cpp
@@ -29,7 +29,7 @@ App::NullCenterOfMass::ofDocumentObject([[maybe_unused]] DocumentObject* object)
     return std::nullopt;
 }
 
-bool App::NullCenterOfMass::supports(DocumentObject* object) const
+bool App::NullCenterOfMass::supports(DocumentObject* /*object*/) const
 {
     return false;
 }
\ No newline at end of file
diff --git a/src/Gui/DAGView/DAGModel.cpp b/src/Gui/DAGView/DAGModel.cpp
index 5b4af951d7..4575d8f5bb 100644
--- a/src/Gui/DAGView/DAGModel.cpp
+++ b/src/Gui/DAGView/DAGModel.cpp
@@ -496,9 +496,6 @@ void Model::updateSlot()
     // sync scene items for graph edge.
     BGL_FORALL_EDGES(currentEdge, *theGraph, Graph)
     {
-        Vertex source = boost::source(currentEdge, *theGraph);
-        Vertex target = boost::target(currentEdge, *theGraph);
-
         if (!(*theGraph)[currentEdge].connector->scene()) {
             this->addItem((*theGraph)[currentEdge].connector.get());
         }
diff --git a/src/Gui/Dialogs/DlgExpressionInput.cpp b/src/Gui/Dialogs/DlgExpressionInput.cpp
index e3bc97ab5e..e82d016017 100644
--- a/src/Gui/Dialogs/DlgExpressionInput.cpp
+++ b/src/Gui/Dialogs/DlgExpressionInput.cpp
@@ -1058,7 +1058,8 @@ void DlgExpressionInput::setMsgText()
     // elide text if it is going out of widget bounds
     // note: this is only 'rough elide', as this text is usually not very long;
     const int msgLinesLimit = 3;
-    if (wrappedMsg.size() > msgContentWidth / msgFontMetrics.averageCharWidth() * msgLinesLimit) {
+    if (static_cast<int>(wrappedMsg.size())
+        > msgContentWidth / msgFontMetrics.averageCharWidth() * msgLinesLimit) {
         const QString elidedMsg = msgFontMetrics.elidedText(
             QString::fromStdString(wrappedMsg),
             Qt::ElideRight,
diff --git a/src/Gui/Dialogs/DlgThemeEditor.h b/src/Gui/Dialogs/DlgThemeEditor.h
index b0c634f8ac..4989eca631 100644
--- a/src/Gui/Dialogs/DlgThemeEditor.h
+++ b/src/Gui/Dialogs/DlgThemeEditor.h
@@ -94,7 +94,7 @@ public:
     std::optional<StyleParameters::Parameter> get(const std::string& name) const override;
 
     void reset();
-    void flush();
+    void flush() override;
 
     int rowCount(const QModelIndex& index) const override;
     int columnCount(const QModelIndex& index) const override;
diff --git a/src/Mod/Assembly/App/AssemblyLink.cpp b/src/Mod/Assembly/App/AssemblyLink.cpp
index f61537f515..48d3857d21 100644
--- a/src/Mod/Assembly/App/AssemblyLink.cpp
+++ b/src/Mod/Assembly/App/AssemblyLink.cpp
@@ -323,7 +323,7 @@ void AssemblyLink::synchronizeComponents()
                             = srcLink->ElementList.getValues();
                         const std::vector<App::DocumentObject*> newElements
                             = link2->ElementList.getValues();
-                        for (int i = 0; i < srcElements.size(); ++i) {
+                        for (size_t i = 0; i < srcElements.size(); ++i) {
                             objLinkMap[srcElements[i]] = newElements[i];
                         }
                         break;
@@ -373,7 +373,7 @@ void AssemblyLink::synchronizeComponents()
                 newLink->ElementCount.setValue(srcLink->ElementCount.getValue());
                 const std::vector<App::DocumentObject*> srcElements = srcLink->ElementList.getValues();
                 const std::vector<App::DocumentObject*> newElements = newLink->ElementList.getValues();
-                for (int i = 0; i < srcElements.size(); ++i) {
+                for (size_t i = 0; i < srcElements.size(); ++i) {
                     auto* newObj = newElements[i];
                     auto* srcObj = srcElements[i];
                     if (newObj && srcObj) {
diff --git a/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp b/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp
index 418cbb1084..7d56b9628f 100644
--- a/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp
+++ b/src/Mod/Assembly/Gui/TaskAssemblyMessages.cpp
@@ -69,7 +69,7 @@ void TaskAssemblyMessages::updateToolTip(const QString& link)
     }
 }
 
-void TaskAssemblyMessages::onLabelStatusLinkClicked(const QString& str)
+void TaskAssemblyMessages::onLabelStatusLinkClicked(const QString& /*str*/)
 {
     // The commands are not implemented yet since App is not reporting yet the solver's status
     /* if (str == QStringLiteral("#conflicting")) {
diff --git a/src/Mod/Assembly/Gui/TaskAssemblyMessages.h b/src/Mod/Assembly/Gui/TaskAssemblyMessages.h
index 2a2892b843..ae95138c0d 100644
--- a/src/Mod/Assembly/Gui/TaskAssemblyMessages.h
+++ b/src/Mod/Assembly/Gui/TaskAssemblyMessages.h
@@ -44,7 +44,7 @@ public:
 private:
     void onLabelStatusLinkClicked(const QString&) override;
 
-    void updateToolTip(const QString& link);
+    void updateToolTip(const QString& link) override;
 
 protected:
     ViewProviderAssembly* vp;
diff --git a/src/Mod/Assembly/Gui/ViewProviderAssembly.h b/src/Mod/Assembly/Gui/ViewProviderAssembly.h
index 76a2dabdd4..e551a8e8a0 100644
--- a/src/Mod/Assembly/Gui/ViewProviderAssembly.h
+++ b/src/Mod/Assembly/Gui/ViewProviderAssembly.h
@@ -284,7 +284,6 @@ private:
         std::set<App::DocumentObject*>& visited
     );
 
-    TaskAssemblyMessages* taskSolver;
     boost::signals2::connection connectSolverUpdate;
     boost::signals2::scoped_connection m_preTransactionConn;
 };
diff --git a/src/Mod/Measure/App/Measurement.cpp b/src/Mod/Measure/App/Measurement.cpp
index 5e68309717..d44e441ca6 100644
--- a/src/Mod/Measure/App/Measurement.cpp
+++ b/src/Mod/Measure/App/Measurement.cpp
@@ -327,6 +327,7 @@ MeasureType Measurement::getType()
 
 TopoDS_Shape Measurement::getShape(App::DocumentObject* obj, const char* subName, TopAbs_ShapeEnum hint) const
 {
+    (void)hint;
     return Part::Feature::getShape(
         obj,
         Part::ShapeOption::NeedSubElement | Part::ShapeOption::ResolveLink
diff --git a/src/Mod/PartDesign/Gui/TaskRevolutionParameters.cpp b/src/Mod/PartDesign/Gui/TaskRevolutionParameters.cpp
index 5a1b27a1a4..472e65b73f 100644
--- a/src/Mod/PartDesign/Gui/TaskRevolutionParameters.cpp
+++ b/src/Mod/PartDesign/Gui/TaskRevolutionParameters.cpp
@@ -775,7 +775,6 @@ void TaskRevolutionParameters::setGizmoPositions()
 
     bool ret;
     if (isGroove) {
-        auto groove = getObject<PartDesign::Groove>();
         ret = getFeatureProps(getObject<PartDesign::Groove>());
     }
     else {
diff --git a/src/Mod/Sketcher/Gui/Command.cpp b/src/Mod/Sketcher/Gui/Command.cpp
index 082e69ad46..28af78476f 100644
--- a/src/Mod/Sketcher/Gui/Command.cpp
+++ b/src/Mod/Sketcher/Gui/Command.cpp
@@ -1614,7 +1614,7 @@ void RenderingOrderAction::updateWidget()
     int midid = hGrp->GetInt("MidRenderGeometryId", 2);
     int lowid = hGrp->GetInt("LowRenderGeometryId", 3);
 
-    auto idToText = [this](int id) -> QString {
+    auto idToText = [](int id) -> QString {
         switch (id) {
         case 1:
             return tr("Normal geometry");
diff --git a/src/Mod/Sketcher/Gui/CommandConstraints.cpp b/src/Mod/Sketcher/Gui/CommandConstraints.cpp
index c5bc4a4c4b..07bbb108bd 100644
--- a/src/Mod/Sketcher/Gui/CommandConstraints.cpp
+++ b/src/Mod/Sketcher/Gui/CommandConstraints.cpp
@@ -1034,8 +1034,9 @@ public:
         Gui::Selection().rmvSelectionGate();
     }
 
-    void mouseMove(SnapManager::SnapHandle snapHandle) override
-    {}
+    void mouseMove(SnapManager::SnapHandle /*snapHandle*/) override
+    {
+    }
 
     bool pressButton(Base::Vector2d /*onSketchPos*/) override
     {
diff --git a/src/Mod/Sketcher/Gui/DrawSketchHandlerOffset.h b/src/Mod/Sketcher/Gui/DrawSketchHandlerOffset.h
index 546903c1d4..90bf54fc9d 100644
--- a/src/Mod/Sketcher/Gui/DrawSketchHandlerOffset.h
+++ b/src/Mod/Sketcher/Gui/DrawSketchHandlerOffset.h
@@ -298,7 +298,7 @@ private:
         return line;
     }
 
-    Part::Geometry* curveToCircleOrArc(BRepAdaptor_Curve curve, const TopoDS_Edge& edge)
+    Part::Geometry* curveToCircleOrArc(BRepAdaptor_Curve curve, const TopoDS_Edge& /*edge*/)
     {
         gp_Circ circle = curve.Circle();
         gp_Pnt cnt = circle.Location();
@@ -330,7 +330,7 @@ private:
         }
     }
 
-    Part::Geometry* curveToEllipseOrArc(BRepAdaptor_Curve curve, const TopoDS_Edge& edge)
+    Part::Geometry* curveToEllipseOrArc(BRepAdaptor_Curve curve, const TopoDS_Edge& /*edge*/)
     {
         gp_Elips ellipse = curve.Ellipse();
         gp_Pnt beg = curve.Value(curve.FirstParameter());
diff --git a/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp b/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp
index 56a7cf5ef9..1f190b24f2 100644
--- a/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp
+++ b/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp
@@ -121,11 +121,9 @@ void EditModeCoinManager::ParameterObserver::initParameters()
          [this](const std::string& param) { updateConstraintPresentationParameters(param); }},
         {"DimensionalStringFormat",
          [this](const std::string& param) { updateConstraintPresentationParameters(param); }},
-        {"ViewScalingFactor",
-         [this](const std::string& param) { Client.updateElementSizeParameters(); }},
-        {"MarkerSize", [this](const std::string& param) { Client.updateElementSizeParameters(); }},
-        {"EditSketcherFontSize",
-         [this](const std::string& param) { Client.updateElementSizeParameters(); }},
+        {"ViewScalingFactor", [this](const std::string&) { Client.updateElementSizeParameters(); }},
+        {"MarkerSize", [this](const std::string&) { Client.updateElementSizeParameters(); }},
+        {"EditSketcherFontSize", [this](const std::string&) { Client.updateElementSizeParameters(); }},
         {"EdgeWidth",
          [this, &drawingParameters = Client.drawingParameters](const std::string& param) {
              updateWidth(drawingParameters.CurveWidth, param, 2);
diff --git a/src/Mod/TechDraw/App/DrawComplexSection.cpp b/src/Mod/TechDraw/App/DrawComplexSection.cpp
index 2846af7ecb..2065c0926e 100644
--- a/src/Mod/TechDraw/App/DrawComplexSection.cpp
+++ b/src/Mod/TechDraw/App/DrawComplexSection.cpp
@@ -1558,13 +1558,13 @@ DrawComplexSection::findNormalForFace(const TopoDS_Face& face,
                                       const std::vector<std::pair<int, Base::Vector3d>>& normalKV,
                                       const std::vector<TopoDS_Edge>& segmentEdges)
 {
-    int index = getSegmentIndex(face, segmentEdges);
+    size_t index = getSegmentIndex(face, segmentEdges);
     if (index < 0  ||
         index >= segmentEdges.size()) {     //NOLINT
         throw Base::RuntimeError("DCS::findNormalForFace - did not find normal for face!");
     }
     for (auto& keyValue : normalKV) {
-        if (keyValue.first == index) {
+        if (static_cast<size_t>(keyValue.first) == index) {
             return keyValue;
         }
     }
diff --git a/src/Mod/TechDraw/Gui/QGIView.cpp b/src/Mod/TechDraw/Gui/QGIView.cpp
index 0f3ca64fc1..19b0574b6d 100644
--- a/src/Mod/TechDraw/Gui/QGIView.cpp
+++ b/src/Mod/TechDraw/Gui/QGIView.cpp
@@ -74,8 +74,6 @@ using namespace TechDrawGui;
 using namespace TechDraw;
 using DU = DrawUtil;
 
-const float labelCaptionFudge = 0.2f;   // temp fiddle for devel
-
 QGIView::QGIView()
     :QGraphicsItemGroup(),
     m_isHovered(false),