diff --git a/src/PhpSpreadsheet/Chart/Axis.php b/src/PhpSpreadsheet/Chart/Axis.php
index 3f9249ced..5b20e91dd 100644
--- a/src/PhpSpreadsheet/Chart/Axis.php
+++ b/src/PhpSpreadsheet/Chart/Axis.php
@@ -316,4 +316,16 @@ class Axis extends Properties
     {
         return $this->noFill;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        parent::__clone();
+        $this->majorGridlines = ($this->majorGridlines === null) ? null : clone $this->majorGridlines;
+        $this->majorGridlines = ($this->minorGridlines === null) ? null : clone $this->minorGridlines;
+        $this->axisText = ($this->axisText === null) ? null : clone $this->axisText;
+        $this->fillColor = clone $this->fillColor;
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/AxisText.php b/src/PhpSpreadsheet/Chart/AxisText.php
index e06a2c88a..09d6b2a5e 100644
--- a/src/PhpSpreadsheet/Chart/AxisText.php
+++ b/src/PhpSpreadsheet/Chart/AxisText.php
@@ -51,4 +51,13 @@ class AxisText extends Properties
 
         return $this;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        parent::__clone();
+        $this->font = clone $this->font;
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/Chart.php b/src/PhpSpreadsheet/Chart/Chart.php
index 2b8de5d51..70f6b4a5f 100644
--- a/src/PhpSpreadsheet/Chart/Chart.php
+++ b/src/PhpSpreadsheet/Chart/Chart.php
@@ -835,4 +835,21 @@ class Chart
     {
         return $this->renderedHeight;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->worksheet = null;
+        $this->title = ($this->title === null) ? null : clone $this->title;
+        $this->legend = ($this->legend === null) ? null : clone $this->legend;
+        $this->xAxisLabel = ($this->xAxisLabel === null) ? null : clone $this->xAxisLabel;
+        $this->yAxisLabel = ($this->yAxisLabel === null) ? null : clone $this->yAxisLabel;
+        $this->plotArea = ($this->plotArea === null) ? null : clone $this->plotArea;
+        $this->xAxis = clone $this->xAxis;
+        $this->yAxis = clone $this->yAxis;
+        $this->borderLines = clone $this->borderLines;
+        $this->fillColor = clone $this->fillColor;
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/DataSeries.php b/src/PhpSpreadsheet/Chart/DataSeries.php
index 647579345..b8656ad5d 100644
--- a/src/PhpSpreadsheet/Chart/DataSeries.php
+++ b/src/PhpSpreadsheet/Chart/DataSeries.php
@@ -408,4 +408,31 @@ class DataSeries
             }
         }
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $plotLabels = $this->plotLabel;
+        $this->plotLabel = [];
+        foreach ($plotLabels as $plotLabel) {
+            $this->plotLabel[] = $plotLabel;
+        }
+        $plotCategories = $this->plotCategory;
+        $this->plotCategory = [];
+        foreach ($plotCategories as $plotCategory) {
+            $this->plotCategory[] = clone $plotCategory;
+        }
+        $plotValues = $this->plotValues;
+        $this->plotValues = [];
+        foreach ($plotValues as $plotValue) {
+            $this->plotValues[] = clone $plotValue;
+        }
+        $plotBubbleSizes = $this->plotBubbleSizes;
+        $this->plotBubbleSizes = [];
+        foreach ($plotBubbleSizes as $plotBubbleSize) {
+            $this->plotBubbleSizes[] = clone $plotBubbleSize;
+        }
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/DataSeriesValues.php b/src/PhpSpreadsheet/Chart/DataSeriesValues.php
index 72bbf8103..b31714b72 100644
--- a/src/PhpSpreadsheet/Chart/DataSeriesValues.php
+++ b/src/PhpSpreadsheet/Chart/DataSeriesValues.php
@@ -587,4 +587,29 @@ class DataSeriesValues extends Properties
     {
         return $this->trendLines;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        parent::__clone();
+        $this->markerFillColor = clone $this->markerFillColor;
+        $this->markerBorderColor = clone $this->markerBorderColor;
+        if (is_array($this->fillColor)) {
+            $fillColor = $this->fillColor;
+            $this->fillColor = [];
+            foreach ($fillColor as $color) {
+                $this->fillColor[] = clone $color;
+            }
+        } elseif ($this->fillColor instanceof ChartColor) {
+            $this->fillColor = clone $this->fillColor;
+        }
+        $this->labelLayout = ($this->labelLayout === null) ? null : clone $this->labelLayout;
+        $trendLines = $this->trendLines;
+        $this->trendLines = [];
+        foreach ($trendLines as $trendLine) {
+            $this->trendLines[] = clone $trendLine;
+        }
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/Layout.php b/src/PhpSpreadsheet/Chart/Layout.php
index f64f53319..97bbc8fd8 100644
--- a/src/PhpSpreadsheet/Chart/Layout.php
+++ b/src/PhpSpreadsheet/Chart/Layout.php
@@ -528,4 +528,15 @@ class Layout
 
         return $this;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->labelFillColor = ($this->labelFillColor === null) ? null : clone $this->labelFillColor;
+        $this->labelBorderColor = ($this->labelBorderColor === null) ? null : clone $this->labelBorderColor;
+        $this->labelFont = ($this->labelFont === null) ? null : clone $this->labelFont;
+        $this->labelEffects = ($this->labelEffects === null) ? null : clone $this->labelEffects;
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/Legend.php b/src/PhpSpreadsheet/Chart/Legend.php
index 7c5fa1833..44c098d95 100644
--- a/src/PhpSpreadsheet/Chart/Legend.php
+++ b/src/PhpSpreadsheet/Chart/Legend.php
@@ -175,4 +175,15 @@ class Legend
 
         return $this;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->layout = ($this->layout === null) ? null : clone $this->layout;
+        $this->legendText = ($this->legendText === null) ? null : clone $this->legendText;
+        $this->borderLines = clone $this->borderLines;
+        $this->fillColor = clone $this->fillColor;
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/PlotArea.php b/src/PhpSpreadsheet/Chart/PlotArea.php
index aa72fda16..5064d5a0d 100644
--- a/src/PhpSpreadsheet/Chart/PlotArea.php
+++ b/src/PhpSpreadsheet/Chart/PlotArea.php
@@ -201,4 +201,17 @@ class PlotArea
 
         return $this;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->layout = ($this->layout === null) ? null : clone $this->layout;
+        $plotSeries = $this->plotSeries;
+        $this->plotSeries = [];
+        foreach ($plotSeries as $series) {
+            $this->plotSeries[] = clone $series;
+        }
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/Properties.php b/src/PhpSpreadsheet/Chart/Properties.php
index 740702d12..8074df678 100644
--- a/src/PhpSpreadsheet/Chart/Properties.php
+++ b/src/PhpSpreadsheet/Chart/Properties.php
@@ -957,4 +957,14 @@ abstract class Properties
     {
         return $this->getLineStyleProperty(['arrow', $arrow, 'len']);
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->lineColor = clone $this->lineColor;
+        $this->glowColor = clone $this->glowColor;
+        $this->shadowColor = clone $this->shadowColor;
+    }
 }
diff --git a/src/PhpSpreadsheet/Chart/Title.php b/src/PhpSpreadsheet/Chart/Title.php
index 378987446..e9c42a4c4 100644
--- a/src/PhpSpreadsheet/Chart/Title.php
+++ b/src/PhpSpreadsheet/Chart/Title.php
@@ -163,4 +163,22 @@ class Title
 
         return $this;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->layout = ($this->layout === null) ? null : clone $this->layout;
+        $this->font = ($this->font === null) ? null : clone $this->font;
+        if (is_array($this->caption)) {
+            $captions = $this->caption;
+            $this->caption = [];
+            foreach ($captions as $caption) {
+                $this->caption[] = is_object($caption) ? (clone $caption) : $caption;
+            }
+        } else {
+            $this->caption = is_object($this->caption) ? (clone $this->caption) : $this->caption;
+        }
+    }
 }
diff --git a/src/PhpSpreadsheet/Style/Font.php b/src/PhpSpreadsheet/Style/Font.php
index ea26b8ce6..78b3f0dc1 100644
--- a/src/PhpSpreadsheet/Style/Font.php
+++ b/src/PhpSpreadsheet/Style/Font.php
@@ -878,4 +878,14 @@ class Font extends Supervisor
     {
         return $this->cap;
     }
+
+    /**
+     * Implement PHP __clone to create a deep clone, not just a shallow copy.
+     */
+    public function __clone()
+    {
+        $this->color = clone $this->color;
+        $this->chartColor = ($this->chartColor === null) ? null : clone $this->chartColor;
+        $this->underlineColor = ($this->underlineColor === null) ? null : clone $this->underlineColor;
+    }
 }
diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index d572f6ccc..54b9a70e6 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -3739,10 +3739,8 @@ class Worksheet implements IComparable
                     $currentCollection = $this->drawingCollection;
                     $this->drawingCollection = new ArrayObject();
                     foreach ($currentCollection as $item) {
-                        if (is_object($item)) {
-                            $newDrawing = clone $item;
-                            $newDrawing->setWorksheet($this);
-                        }
+                        $newDrawing = clone $item;
+                        $newDrawing->setWorksheet($this);
                     }
                 } elseif ($key == 'tableCollection') {
                     $currentCollection = $this->tableCollection;
@@ -3752,6 +3750,13 @@ class Worksheet implements IComparable
                         $newTable->setName($item->getName() . 'clone');
                         $this->addTable($newTable);
                     }
+                } elseif ($key == 'chartCollection') {
+                    $currentCollection = $this->chartCollection;
+                    $this->chartCollection = new ArrayObject();
+                    foreach ($currentCollection as $item) {
+                        $newChart = clone $item;
+                        $this->addChart($newChart);
+                    }
                 } elseif (($key == 'autoFilter') && ($this->autoFilter instanceof AutoFilter)) {
                     $newAutoFilter = clone $this->autoFilter;
                     $this->autoFilter = $newAutoFilter;
diff --git a/tests/PhpSpreadsheetTests/Chart/ChartCloneTest.php b/tests/PhpSpreadsheetTests/Chart/ChartCloneTest.php
new file mode 100644
index 000000000..55c35e6d9
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Chart/ChartCloneTest.php
@@ -0,0 +1,164 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Chart;
+
+use PhpOffice\PhpSpreadsheet\Chart\Properties;
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx as XlsxReader;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+/**
+ * Confirm cloning worksheet works as expected.
+ * This class tests everything except:
+ *   DataSeriesValues - no coverage for fillColor as array.
+ *   Title - no coverage for caption when not array.
+ */
+class ChartCloneTest extends AbstractFunctional
+{
+    private const DIRECTORY = 'samples' . DIRECTORY_SEPARATOR . 'templates' . DIRECTORY_SEPARATOR;
+
+    public function testCloneSheet(): void
+    {
+        $file = self::DIRECTORY . '32readwriteLineChart5.xlsx';
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load($file);
+        $oldSheet = $spreadsheet->getActiveSheet();
+
+        $sheet = clone $oldSheet;
+        $sheet->setTitle('test2');
+        $spreadsheet->addsheet($sheet);
+
+        $oldCharts = $oldSheet->getChartCollection();
+        self::assertCount(1, $oldCharts);
+        $oldChart = $oldCharts[0];
+        self::assertNotNull($oldChart);
+
+        $charts = $sheet->getChartCollection();
+        self::assertCount(1, $charts);
+        $chart = $charts[0];
+        self::assertNotNull($chart);
+        self::assertNotSame($oldChart, $chart);
+
+        self::assertSame('ffffff', $chart->getFillColor()->getValue());
+        self::assertSame('srgbClr', $chart->getFillColor()->getType());
+        self::assertSame('d9d9d9', $chart->getBorderLines()->getLineColorProperty('value'));
+        self::assertSame('srgbClr', $chart->getBorderLines()->getLineColorProperty('type'));
+        self::assertEqualsWithDelta(9360 / Properties::POINTS_WIDTH_MULTIPLIER, $chart->getBorderLines()->getLineStyleProperty('width'), 1.0E-8);
+        self::assertTrue($chart->getChartAxisY()->getNoFill());
+        self::assertFalse($chart->getChartAxisX()->getNoFill());
+
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testCloneSheetWithLegendAndTitle(): void
+    {
+        $file = self::DIRECTORY . '32readwriteChartWithImages1.xlsx';
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load($file);
+        $oldSheet = $spreadsheet->getActiveSheet();
+
+        $sheet = clone $oldSheet;
+        $sheet->setTitle('test2');
+        $spreadsheet->addsheet($sheet);
+
+        $oldCharts = $oldSheet->getChartCollection();
+        self::assertCount(1, $oldCharts);
+        $oldChart = $oldCharts[0];
+        self::assertNotNull($oldChart);
+
+        $charts = $sheet->getChartCollection();
+        self::assertCount(1, $charts);
+        $chart = $charts[0];
+        self::assertNotNull($chart);
+        self::assertNotSame($oldChart, $chart);
+
+        self::assertNotNull($chart->getLegend());
+        self::assertNotSame($chart->getLegend(), $oldChart->getLegend());
+        self::assertNotNull($chart->getTitle());
+        self::assertNotSame($chart->getTitle(), $oldChart->getTitle());
+
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testCloneSheetWithBubbleSizes(): void
+    {
+        $file = self::DIRECTORY . '32readwriteBubbleChart2.xlsx';
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load($file);
+        $oldSheet = $spreadsheet->getActiveSheet();
+
+        $sheet = clone $oldSheet;
+        $sheet->setTitle('test2');
+        $spreadsheet->addsheet($sheet);
+
+        $oldCharts = $oldSheet->getChartCollection();
+        self::assertCount(1, $oldCharts);
+        $oldChart = $oldCharts[0];
+        self::assertNotNull($oldChart);
+
+        $charts = $sheet->getChartCollection();
+        self::assertCount(1, $charts);
+        $chart = $charts[0];
+        self::assertNotNull($chart);
+        self::assertNotSame($oldChart, $chart);
+
+        $oldGroup = $oldChart->getPlotArea()?->getPlotGroup();
+        self::assertNotNull($oldGroup);
+        self::assertCount(1, $oldGroup);
+        $oldSizes = $oldGroup[0]->getPlotBubbleSizes();
+        self::assertCount(2, $oldSizes);
+
+        $plotGroup = $chart->getPlotArea()?->getPlotGroup();
+        self::assertNotNull($plotGroup);
+        self::assertCount(1, $plotGroup);
+        $bubbleSizes = $plotGroup[0]->getPlotBubbleSizes();
+        self::assertCount(2, $bubbleSizes);
+        self::assertNotSame($bubbleSizes, $oldSizes);
+
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testCloneSheetWithTrendLines(): void
+    {
+        $file = self::DIRECTORY . '32readwriteScatterChartTrendlines1.xlsx';
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load($file);
+        $oldSheet = $spreadsheet->getActiveSheet();
+
+        $sheet = clone $oldSheet;
+        $sheet->setTitle('test2');
+        $spreadsheet->addsheet($sheet);
+
+        $oldCharts = $oldSheet->getChartCollection();
+        self::assertCount(2, $oldCharts);
+        $oldChart = $oldCharts[1];
+        self::assertNotNull($oldChart);
+
+        $charts = $sheet->getChartCollection();
+        self::assertCount(2, $charts);
+        $chart = $charts[1];
+        self::assertNotNull($chart);
+        self::assertNotSame($oldChart, $chart);
+
+        $oldGroup = $chart->getPlotArea()?->getPlotGroup();
+        self::assertNotNull($oldGroup);
+        self::assertCount(1, $oldGroup);
+        $oldLabels = $oldGroup[0]->getPlotLabels();
+        self::assertCount(1, $oldLabels);
+        self::assertCount(3, $oldLabels[0]->getTrendLines());
+
+        $plotGroup = $chart->getPlotArea()?->getPlotGroup();
+        self::assertNotNull($plotGroup);
+        self::assertCount(1, $plotGroup);
+        $plotLabels = $plotGroup[0]->getPlotLabels();
+        self::assertCount(1, $plotLabels);
+        self::assertCount(3, $plotLabels[0]->getTrendLines());
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}