diff --git a/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.cpp b/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.cpp
index 759b5c8bf5..4ebe1d092d 100644
--- a/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.cpp
+++ b/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.cpp
@@ -218,6 +218,7 @@ RimWellLogTrack::RimWellLogTrack()
     m_colorShadingTransparency.uiCapability()->setUiEditorTypeName( caf::PdmUiSliderEditor::uiEditorTypeName() );
 
     CAF_PDM_InitField( &m_showRegionLabels, "ShowFormationLabels", true, "Show Labels", "", "", "" );
+    CAF_PDM_InitFieldNoDefault( &m_regionLabelFontSize, "RegionLabelFontSize", "Font Size", "", "", "" );
 
     CAF_PDM_InitFieldNoDefault( &m_formationSource, "FormationSource", "Source", "", "", "" );
 
@@ -617,7 +618,7 @@ void RimWellLogTrack::fieldChangedByUi( const caf::PdmFieldHandle* changedField,
         updateConnectedEditors();
         RiuPlotMainWindowTools::refreshToolbars();
     }
-    else if ( changedField == &m_showRegionLabels )
+    else if ( changedField == &m_showRegionLabels || changedField == &m_regionLabelFontSize )
     {
         loadDataAndUpdate();
     }
@@ -1742,6 +1743,8 @@ void RimWellLogTrack::defineUiOrdering( QString uiConfigName, caf::PdmUiOrdering
     annotationGroup->add( &m_regionAnnotationType );
     annotationGroup->add( &m_regionAnnotationDisplay );
     annotationGroup->add( &m_showRegionLabels );
+    if ( m_regionAnnotationType() == RiuPlotAnnotationTool::RegionAnnotationType::RESULT_PROPERTY_ANNOTATIONS )
+        annotationGroup->add( &m_regionLabelFontSize );
 
     if ( m_regionAnnotationDisplay() & RiuPlotAnnotationTool::COLOR_SHADING ||
          m_regionAnnotationDisplay() & RiuPlotAnnotationTool::COLORED_LINES )
@@ -2760,6 +2763,10 @@ void RimWellLogTrack::updateResultPropertyNamesOnPlot()
         }
 
         caf::ColorTable colorTable( colors );
+
+        int fontSize = caf::FontTools::absolutePointSize( RiaPreferences::current()->defaultPlotFontSize(),
+                                                          m_regionLabelFontSize() );
+
         m_annotationTool->attachNamedRegions( m_plotWidget,
                                               namesToPlot,
                                               xRange,
@@ -2767,7 +2774,10 @@ void RimWellLogTrack::updateResultPropertyNamesOnPlot()
                                               m_regionAnnotationDisplay(),
                                               colorTable,
                                               ( ( 100 - m_colorShadingTransparency ) * 255 ) / 100,
-                                              m_showRegionLabels() );
+                                              m_showRegionLabels(),
+                                              RiuPlotAnnotationTool::TrackSpan::FULL_WIDTH,
+                                              {},
+                                              fontSize );
     }
 }
 
diff --git a/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.h b/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.h
index 8aa893f779..fb2a611a91 100644
--- a/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.h
+++ b/ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogTrack.h
@@ -329,6 +329,7 @@ private:
     caf::PdmPtrField<RimColorLegend*>                                  m_colorShadingLegend;
     caf::PdmField<int>                                                 m_colorShadingTransparency;
     caf::PdmField<bool>                                                m_showRegionLabels;
+    caf::PdmField<caf::FontTools::RelativeSizeEnum>                    m_regionLabelFontSize;
     caf::PdmField<caf::AppEnum<FormationSource>>                       m_formationSource;
     caf::PdmPtrField<RimCase*>                                         m_formationCase;
     caf::PdmField<caf::AppEnum<TrajectoryType>>                        m_formationTrajectoryType;
diff --git a/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.cpp b/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.cpp
index 9c11683875..0aedbfb7b7 100644
--- a/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.cpp
+++ b/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.cpp
@@ -50,7 +50,8 @@ void RiuPlotAnnotationTool::attachNamedRegions( QwtPlot*
                                                 int                                           shadingAlphaByte,
                                                 bool                                          showNames /*= true */,
                                                 TrackSpan                          trackSpan /*= FULL_WIDTH*/,
-                                                const std::vector<Qt::BrushStyle>& brushStyles /* = {}*/ )
+                                                const std::vector<Qt::BrushStyle>& brushStyles /* = {}*/,
+                                                int                                fontSize )
 {
     if ( names.size() != yPositions.size() ) return;
     m_plot = plot;
@@ -120,14 +121,26 @@ void RiuPlotAnnotationTool::attachNamedRegions( QwtPlot*
             textColor = lineColor;
         }
         Qt::Alignment horizontalAlignment = trackTextAlignment( trackSpan );
-        RiuPlotAnnotationTool::horizontalDashedLine( line, name, yPositions[i].first, lineColor, textColor, horizontalAlignment );
+        RiuPlotAnnotationTool::horizontalDashedLine( line,
+                                                     name,
+                                                     yPositions[i].first,
+                                                     lineColor,
+                                                     textColor,
+                                                     horizontalAlignment,
+                                                     fontSize );
         line->attach( m_plot );
         m_horizontalMarkers.push_back( std::move( line ) );
 
         if ( ( i != names.size() - 1 ) && cvf::Math::abs( yPositions[i].second - yPositions[i + 1].first ) > delta )
         {
             QwtPlotMarker* bottomLine( new QwtPlotMarker() );
-            RiuPlotAnnotationTool::horizontalDashedLine( bottomLine, QString(), yPositions[i].second, lineColor, textColor );
+            RiuPlotAnnotationTool::horizontalDashedLine( bottomLine,
+                                                         QString(),
+                                                         yPositions[i].second,
+                                                         lineColor,
+                                                         textColor,
+                                                         Qt::AlignRight,
+                                                         fontSize );
 
             bottomLine->attach( m_plot );
             m_horizontalMarkers.push_back( std::move( bottomLine ) );
@@ -283,7 +296,8 @@ void RiuPlotAnnotationTool::horizontalDashedLine( QwtPlotMarker* line,
                                                   double         yValue,
                                                   const QColor&  color /*= QColor(0, 0, 100) */,
                                                   const QColor&  textColor /*= QColor(0, 0, 100) */,
-                                                  Qt::Alignment  horizontalAlignment /*= Qt::AlignRight */ )
+                                                  Qt::Alignment  horizontalAlignment /*= Qt::AlignRight */,
+                                                  int            fontSize )
 {
     QPen curvePen;
     curvePen.setStyle( Qt::DashLine );
@@ -295,6 +309,7 @@ void RiuPlotAnnotationTool::horizontalDashedLine( QwtPlotMarker* line,
     line->setYValue( yValue );
     QwtText label( name );
     label.setColor( textColor );
+    if ( fontSize > 0 ) label.setFont( QFont( label.font().key(), fontSize ) );
     line->setLabel( label );
     line->setLabelAlignment( horizontalAlignment | Qt::AlignBottom );
 }
diff --git a/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.h b/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.h
index 7f6bd47a81..c6477db97e 100644
--- a/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.h
+++ b/ApplicationLibCode/UserInterface/RiuPlotAnnotationTool.h
@@ -74,7 +74,8 @@ public:
                              int                                           shadingAlphaByte,
                              bool                                          showNames   = true,
                              TrackSpan                                     trackSpan   = TrackSpan::FULL_WIDTH,
-                             const std::vector<Qt::BrushStyle>&            brushStyles = {} );
+                             const std::vector<Qt::BrushStyle>&            brushStyles = {},
+                             int                                           fontSize    = 0 );
     void attachWellPicks( QwtPlot* plot, const std::vector<QString>& names, const std::vector<double>& yPositions );
 
     void attachAnnotationLine( QwtPlot*       plot,
@@ -112,7 +113,8 @@ private:
                                                double         yValue,
                                                const QColor&  color               = QColor( 0, 0, 100 ),
                                                const QColor&  textColor           = QColor( 0, 0, 100 ),
-                                               Qt::Alignment  horizontalAlignment = Qt::AlignRight );
+                                               Qt::Alignment  horizontalAlignment = Qt::AlignRight,
+                                               int            fontSize            = 0 );
 
     void verticalLine( QwtPlotMarker* line,
                        const QString& name,