diff --git a/apps/esmtool/record.cpp b/apps/esmtool/record.cpp
index fba1291a4c..d2cc89520c 100644
--- a/apps/esmtool/record.cpp
+++ b/apps/esmtool/record.cpp
@@ -781,7 +781,7 @@ namespace EsmTool
         for (int skill : mData.mData.mSkills)
             if (skill != -1)
                 std::cout << "  Skill: " << skillLabel(skill) << " (" << skill << ")" << std::endl;
-        for (int i = 0; i != mData.mData.mRankData.size(); i++)
+        for (size_t i = 0; i != mData.mData.mRankData.size(); i++)
             if (!mData.mRanks[i].empty())
             {
                 std::cout << "  Rank: " << mData.mRanks[i] << std::endl;
diff --git a/apps/essimporter/converter.hpp b/apps/essimporter/converter.hpp
index 001305f362..93b4e2c810 100644
--- a/apps/essimporter/converter.hpp
+++ b/apps/essimporter/converter.hpp
@@ -249,7 +249,7 @@ namespace ESSImport
             {
                 ESM::InventoryState& invState = mContext->mPlayer.mObject.mInventory;
 
-                for (unsigned int i = 0; i < invState.mItems.size(); ++i)
+                for (size_t i = 0; i < invState.mItems.size(); ++i)
                 {
                     // FIXME: in case of conflict (multiple items with this refID) use the already equipped one?
                     if (invState.mItems[i].mRef.mRefID == ESM::RefId::stringRefId(refr.mActorData.mSelectedEnchantItem))
diff --git a/apps/essimporter/importer.cpp b/apps/essimporter/importer.cpp
index 1692193b93..76b685c8a3 100644
--- a/apps/essimporter/importer.cpp
+++ b/apps/essimporter/importer.cpp
@@ -162,7 +162,7 @@ namespace ESSImport
         read(mOutFile, file2); // todo rename variable
 
         // FIXME: use max(size1, size2)
-        for (unsigned int i = 0; i < file1.mRecords.size(); ++i)
+        for (size_t i = 0; i < file1.mRecords.size(); ++i)
         {
             File::Record rec = file1.mRecords[i];
 
@@ -185,7 +185,7 @@ namespace ESSImport
             }
 
             // FIXME: use max(size1, size2)
-            for (unsigned int j = 0; j < rec.mSubrecords.size(); ++j)
+            for (size_t j = 0; j < rec.mSubrecords.size(); ++j)
             {
                 File::Subrecord sub = rec.mSubrecords[j];
 
@@ -221,7 +221,7 @@ namespace ESSImport
                               << std::hex << sub.mFileOffset << " (2) 0x" << sub2.mFileOffset << std::endl;
 
                     std::cout << "Data 1:" << std::endl;
-                    for (unsigned int k = 0; k < sub.mData.size(); ++k)
+                    for (size_t k = 0; k < sub.mData.size(); ++k)
                     {
                         bool different = false;
                         if (k >= sub2.mData.size() || sub2.mData[k] != sub.mData[k])
@@ -236,7 +236,7 @@ namespace ESSImport
                     std::cout << std::endl;
 
                     std::cout << "Data 2:" << std::endl;
-                    for (unsigned int k = 0; k < sub2.mData.size(); ++k)
+                    for (size_t k = 0; k < sub2.mData.size(); ++k)
                     {
                         bool different = false;
                         if (k >= sub.mData.size() || sub.mData[k] != sub2.mData[k])
diff --git a/apps/opencs/model/prefs/enumsetting.cpp b/apps/opencs/model/prefs/enumsetting.cpp
index 3d35aa5825..a3ac9bce2b 100644
--- a/apps/opencs/model/prefs/enumsetting.cpp
+++ b/apps/opencs/model/prefs/enumsetting.cpp
@@ -82,9 +82,9 @@ std::pair<QWidget*, QWidget*> CSMPrefs::EnumSetting::makeWidgets(QWidget* parent
 
     mWidget = new QComboBox(parent);
 
-    int index = 0;
+    size_t index = 0;
 
-    for (int i = 0; i < static_cast<int>(mValues.mValues.size()); ++i)
+    for (size_t i = 0; i < mValues.mValues.size(); ++i)
     {
         if (mDefault.mValue == mValues.mValues[i].mValue)
             index = i;
@@ -95,7 +95,7 @@ std::pair<QWidget*, QWidget*> CSMPrefs::EnumSetting::makeWidgets(QWidget* parent
             mWidget->setItemData(i, QString::fromUtf8(mValues.mValues[i].mTooltip.c_str()), Qt::ToolTipRole);
     }
 
-    mWidget->setCurrentIndex(index);
+    mWidget->setCurrentIndex(static_cast<int>(index));
 
     if (!mTooltip.empty())
     {
diff --git a/apps/opencs/model/tools/referenceablecheck.cpp b/apps/opencs/model/tools/referenceablecheck.cpp
index 8249597b8a..6effa2cbf6 100644
--- a/apps/opencs/model/tools/referenceablecheck.cpp
+++ b/apps/opencs/model/tools/referenceablecheck.cpp
@@ -1039,14 +1039,14 @@ void CSMTools::ReferenceableCheckStage::listCheck(
             someID, "Chance that no object is used is over 100 percent", "", CSMDoc::Message::Severity_Warning);
     }
 
-    for (unsigned i = 0; i < someList.mList.size(); ++i)
+    for (const auto& element : someList.mList)
     {
-        if (mReferencables.searchId(someList.mList[i].mId).first == -1)
-            messages.add(someID, "Object '" + someList.mList[i].mId.getRefIdString() + "' does not exist", "",
+        if (mReferencables.searchId(element.mId).first == -1)
+            messages.add(someID, "Object '" + element.mId.getRefIdString() + "' does not exist", "",
                 CSMDoc::Message::Severity_Error);
 
-        if (someList.mList[i].mLevel < 1)
-            messages.add(someID, "Level of item '" + someList.mList[i].mId.getRefIdString() + "' is non-positive", "",
+        if (element.mLevel < 1)
+            messages.add(someID, "Level of item '" + element.mId.getRefIdString() + "' is non-positive", "",
                 CSMDoc::Message::Severity_Error);
     }
 }
diff --git a/apps/opencs/model/world/columnbase.cpp b/apps/opencs/model/world/columnbase.cpp
index de2e31b0fa..1f963b0e4a 100644
--- a/apps/opencs/model/world/columnbase.cpp
+++ b/apps/opencs/model/world/columnbase.cpp
@@ -134,9 +134,9 @@ CSMWorld::NestableColumn::NestableColumn(int columnId, CSMWorld::ColumnBase::Dis
 
 CSMWorld::NestableColumn::~NestableColumn()
 {
-    for (unsigned int i = 0; i < mNestedColumns.size(); ++i)
+    for (auto* col : mNestedColumns)
     {
-        delete mNestedColumns[i];
+        delete col;
     }
 }
 
diff --git a/apps/opencs/model/world/data.cpp b/apps/opencs/model/world/data.cpp
index 78fa2dd066..1653e8a6b1 100644
--- a/apps/opencs/model/world/data.cpp
+++ b/apps/opencs/model/world/data.cpp
@@ -1026,12 +1026,12 @@ int CSMWorld::Data::getTotalRecords(const std::vector<std::filesystem::path>& fi
 
     std::unique_ptr<ESM::ESMReader> reader = std::make_unique<ESM::ESMReader>();
 
-    for (unsigned int i = 0; i < files.size(); ++i)
+    for (const auto& file : files)
     {
-        if (!std::filesystem::exists(files[i]))
+        if (!std::filesystem::exists(file))
             continue;
 
-        reader->open(files[i]);
+        reader->open(file);
         records += reader->getRecordCount();
         reader->close();
     }
diff --git a/apps/opencs/model/world/tablemimedata.cpp b/apps/opencs/model/world/tablemimedata.cpp
index 37d9a37887..1814e551c1 100644
--- a/apps/opencs/model/world/tablemimedata.cpp
+++ b/apps/opencs/model/world/tablemimedata.cpp
@@ -45,21 +45,21 @@ std::string CSMWorld::TableMimeData::getIcon() const
     std::string tmpIcon;
     bool firstIteration = true;
 
-    for (unsigned i = 0; i < mUniversalId.size(); ++i)
+    for (const auto& id : mUniversalId)
     {
         if (firstIteration)
         {
             firstIteration = false;
-            tmpIcon = mUniversalId[i].getIcon();
+            tmpIcon = id.getIcon();
             continue;
         }
 
-        if (tmpIcon != mUniversalId[i].getIcon())
+        if (tmpIcon != id.getIcon())
         {
             return ":/multitype.png"; // icon stolen from gnome TODO: get new icon
         }
 
-        tmpIcon = mUniversalId[i].getIcon();
+        tmpIcon = id.getIcon();
     }
 
     return mUniversalId.begin()->getIcon(); // All objects are of the same type;
diff --git a/apps/opencs/view/render/pagedworldspacewidget.cpp b/apps/opencs/view/render/pagedworldspacewidget.cpp
index 2ca2afe128..00d519ecc8 100644
--- a/apps/opencs/view/render/pagedworldspacewidget.cpp
+++ b/apps/opencs/view/render/pagedworldspacewidget.cpp
@@ -698,9 +698,9 @@ bool CSVRender::PagedWorldspaceWidget::handleDrop(
         return false;
 
     bool selectionChanged = false;
-    for (unsigned i = 0; i < universalIdData.size(); ++i)
+    for (const auto& id : universalIdData)
     {
-        std::pair<int, int> coordinates(getCoordinatesFromId(universalIdData[i].getId()));
+        std::pair<int, int> coordinates(getCoordinatesFromId(id.getId()));
         if (mSelection.add(CSMWorld::CellCoordinates(coordinates.first, coordinates.second)))
         {
             selectionChanged = true;
diff --git a/apps/opencs/view/render/pathgrid.cpp b/apps/opencs/view/render/pathgrid.cpp
index fe5d87fb81..44e85e7193 100644
--- a/apps/opencs/view/render/pathgrid.cpp
+++ b/apps/opencs/view/render/pathgrid.cpp
@@ -347,10 +347,10 @@ namespace CSVRender
 
             QModelIndex parent = model->index(recordIndex, parentColumn);
 
-            for (size_t i = 0; i < mSelected.size(); ++i)
+            for (const auto& selected : mSelected)
             {
-                const CSMWorld::Pathgrid::Point& point = source->mPoints[mSelected[i]];
-                int row = static_cast<int>(mSelected[i]);
+                const CSMWorld::Pathgrid::Point& point = source->mPoints[selected];
+                int row = static_cast<int>(selected);
 
                 commands.push(new CSMWorld::ModifyCommand(
                     *model, model->index(row, posXColumn, parent), clampToCell(point.mX + offsetX)));
@@ -378,9 +378,9 @@ namespace CSVRender
         const CSMWorld::Pathgrid* source = getPathgridSource();
         if (source)
         {
-            for (size_t i = 0; i < mSelected.size(); ++i)
+            for (const auto& selected : mSelected)
             {
-                addEdge(commands, *source, node, mSelected[i]);
+                addEdge(commands, *source, node, selected);
             }
         }
     }
diff --git a/apps/opencs/view/world/dialoguesubview.cpp b/apps/opencs/view/world/dialoguesubview.cpp
index c20692ba9f..24fe70af94 100644
--- a/apps/opencs/view/world/dialoguesubview.cpp
+++ b/apps/opencs/view/world/dialoguesubview.cpp
@@ -227,11 +227,11 @@ void CSVWorld::DialogueDelegateDispatcher::setEditorData(QWidget* editor, const
         delegateIt->second->setEditorData(editor, index, true);
     }
 
-    for (unsigned i = 0; i < mProxys.size(); ++i)
+    for (const auto& proxy : mProxys)
     {
-        if (mProxys[i]->getEditor() == editor)
+        if (proxy->getEditor() == editor)
         {
-            mProxys[i]->setIndex(index);
+            proxy->setIndex(index);
         }
     }
 }
@@ -341,9 +341,9 @@ QWidget* CSVWorld::DialogueDelegateDispatcher::makeEditor(
 
 CSVWorld::DialogueDelegateDispatcher::~DialogueDelegateDispatcher()
 {
-    for (unsigned i = 0; i < mProxys.size(); ++i)
+    for (auto* proxy : mProxys)
     {
-        delete mProxys[i]; // unique_ptr could be handy
+        delete proxy; // unique_ptr could be handy
     }
 }
 
@@ -477,8 +477,8 @@ void CSVWorld::EditWidget::createEditorContextMenu(
 
 CSVWorld::EditWidget::~EditWidget()
 {
-    for (unsigned i = 0; i < mNestedModels.size(); ++i)
-        delete mNestedModels[i];
+    for (auto* model : mNestedModels)
+        delete model;
 
     if (mDispatcher)
         delete mDispatcher;
@@ -511,8 +511,8 @@ void CSVWorld::EditWidget::remake(int row)
     }
     mMainWidget = new QWidget(this);
 
-    for (unsigned i = 0; i < mNestedModels.size(); ++i)
-        delete mNestedModels[i];
+    for (auto* model : mNestedModels)
+        delete model;
 
     mNestedModels.clear();
 
diff --git a/apps/opencs/view/world/table.cpp b/apps/opencs/view/world/table.cpp
index f5f3fa20ef..1e80805630 100644
--- a/apps/opencs/view/world/table.cpp
+++ b/apps/opencs/view/world/table.cpp
@@ -611,7 +611,7 @@ void CSVWorld::Table::moveRecords(QDropEvent* event)
 
     std::vector<int> newOrder(highestDifference + 1);
 
-    for (long unsigned int i = 0; i < newOrder.size(); ++i)
+    for (int i = 0; i <= highestDifference; ++i)
     {
         newOrder[i] = i;
     }
diff --git a/apps/openmw/mwclass/potion.cpp b/apps/openmw/mwclass/potion.cpp
index 2e6fbddf49..9bab0345cb 100644
--- a/apps/openmw/mwclass/potion.cpp
+++ b/apps/openmw/mwclass/potion.cpp
@@ -108,7 +108,7 @@ namespace MWClass
 
         // hide effects the player doesn't know about
         MWWorld::Ptr player = MWBase::Environment::get().getWorld()->getPlayerPtr();
-        for (unsigned int i = 0; i < info.effects.size(); ++i)
+        for (size_t i = 0; i < info.effects.size(); ++i)
             info.effects[i].mKnown = MWMechanics::Alchemy::knownEffect(i, player);
 
         info.isPotion = true;
diff --git a/apps/openmw/mwgui/formatting.cpp b/apps/openmw/mwgui/formatting.cpp
index f725801782..0c193b4987 100644
--- a/apps/openmw/mwgui/formatting.cpp
+++ b/apps/openmw/mwgui/formatting.cpp
@@ -462,7 +462,7 @@ namespace MWGui::Formatting
         mPaginator.setIgnoreLeadingEmptyLines(true);
 
         const MyGUI::VectorLineInfo& lines = mEditBox->getSubWidgetText()->castType<MyGUI::EditText>()->getLineInfo();
-        for (unsigned int i = lastLine; i < lines.size(); ++i)
+        for (size_t i = lastLine; i < lines.size(); ++i)
         {
             if (lines[i].width == 0)
                 ret += lineHeight;
diff --git a/apps/openmw/mwgui/race.cpp b/apps/openmw/mwgui/race.cpp
index ab2d9bce2d..e239e641c7 100644
--- a/apps/openmw/mwgui/race.cpp
+++ b/apps/openmw/mwgui/race.cpp
@@ -163,13 +163,13 @@ namespace MWGui
         setGender(proto.isMale() ? GM_Male : GM_Female);
         recountParts();
 
-        for (unsigned int i = 0; i < mAvailableHeads.size(); ++i)
+        for (size_t i = 0; i < mAvailableHeads.size(); ++i)
         {
             if (mAvailableHeads[i] == proto.mHead)
                 mFaceIndex = i;
         }
 
-        for (unsigned int i = 0; i < mAvailableHairs.size(); ++i)
+        for (size_t i = 0; i < mAvailableHairs.size(); ++i)
         {
             if (mAvailableHairs[i] == proto.mHair)
                 mHairIndex = i;
diff --git a/apps/openmw/mwgui/travelwindow.cpp b/apps/openmw/mwgui/travelwindow.cpp
index 2c3310b891..b371d979f9 100644
--- a/apps/openmw/mwgui/travelwindow.cpp
+++ b/apps/openmw/mwgui/travelwindow.cpp
@@ -121,19 +121,19 @@ namespace MWGui
         else if (mPtr.getType() == ESM::Creature::sRecordId)
             transport = mPtr.get<ESM::Creature>()->mBase->getTransport();
 
-        for (unsigned int i = 0; i < transport.size(); i++)
+        for (const auto& dest : transport)
         {
-            std::string_view cellname = transport[i].mCellName;
+            std::string_view cellname = dest.mCellName;
             bool interior = true;
             const ESM::ExteriorCellLocation cellIndex
-                = ESM::positionToExteriorCellLocation(transport[i].mPos.pos[0], transport[i].mPos.pos[1]);
+                = ESM::positionToExteriorCellLocation(dest.mPos.pos[0], dest.mPos.pos[1]);
             if (cellname.empty())
             {
                 MWWorld::CellStore& cell = MWBase::Environment::get().getWorldModel()->getExterior(cellIndex);
                 cellname = MWBase::Environment::get().getWorld()->getCellName(&cell);
                 interior = false;
             }
-            addDestination(ESM::RefId::stringRefId(cellname), transport[i].mPos, interior);
+            addDestination(ESM::RefId::stringRefId(cellname), dest.mPos, interior);
         }
 
         updateLabels();