diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f783d65..7b51acbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Support to write merged cells in ODS format [#287](https://github.com/PHPOffice/PhpSpreadsheet/issues/287)
+
 ### Changed
 
 ### Fixed
diff --git a/src/PhpSpreadsheet/Reader/Ods.php b/src/PhpSpreadsheet/Reader/Ods.php
index b433c2d9..5dd8219d 100644
--- a/src/PhpSpreadsheet/Reader/Ods.php
+++ b/src/PhpSpreadsheet/Reader/Ods.php
@@ -696,8 +696,8 @@ class Ods extends BaseReader
                                 }
 
                                 // Merged cells
-                                if ($childNode->hasAttributeNS($tableNs, 'number-columns-spanned')
-                                    || $childNode->hasAttributeNS($tableNs, 'number-rows-spanned')
+                                if ($cellData->hasAttributeNS($tableNs, 'number-columns-spanned')
+                                    || $cellData->hasAttributeNS($tableNs, 'number-rows-spanned')
                                 ) {
                                     if (($type !== DataType::TYPE_NULL) || (!$this->readDataOnly)) {
                                         $columnTo = $columnID;
diff --git a/src/PhpSpreadsheet/Writer/Ods/Content.php b/src/PhpSpreadsheet/Writer/Ods/Content.php
index 69d31eff..40039eea 100644
--- a/src/PhpSpreadsheet/Writer/Ods/Content.php
+++ b/src/PhpSpreadsheet/Writer/Ods/Content.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Ods;
 
+use PhpOffice\PhpSpreadsheet\Cell\Cell;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\Cell\DataType;
 use PhpOffice\PhpSpreadsheet\Shared\XMLWriter;
@@ -183,6 +184,7 @@ class Content extends WriterPart
 
             $this->writeCellSpan($objWriter, $column, $prevColumn);
             $objWriter->startElement('table:table-cell');
+            $this->writeCellMerge($objWriter, $cell);
 
             // Style XF
             $style = $cell->getXfIndex();
@@ -363,4 +365,29 @@ class Content extends WriterPart
             $writer->endElement(); // Close style:style
         }
     }
+
+    /**
+     * Write attributes for merged cell.
+     *
+     * @param XMLWriter $objWriter
+     * @param Cell $cell
+     *
+     * @throws \PhpOffice\PhpSpreadsheet\Exception
+     */
+    private function writeCellMerge(XMLWriter $objWriter, Cell $cell)
+    {
+        if (!$cell->isMergeRangeValueCell()) {
+            return;
+        }
+
+        $mergeRange = Coordinate::splitRange($cell->getMergeRange());
+        list($startCell, $endCell) = $mergeRange[0];
+        $start = Coordinate::coordinateFromString($startCell);
+        $end = Coordinate::coordinateFromString($endCell);
+        $columnSpan = Coordinate::columnIndexFromString($end[0]) - Coordinate::columnIndexFromString($start[0]) + 1;
+        $rowSpan = $end[1] - $start[1] + 1;
+
+        $objWriter->writeAttribute('table:number-columns-spanned', $columnSpan);
+        $objWriter->writeAttribute('table:number-rows-spanned', $rowSpan);
+    }
 }
diff --git a/tests/PhpSpreadsheetTests/MergedCells.php b/tests/PhpSpreadsheetTests/MergedCells.php
new file mode 100644
index 00000000..753c0077
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/MergedCells.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests;
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class MergedCells extends TestCase
+{
+    public function providerMergedCells()
+    {
+        return [
+//            ['Html'],
+//            ['Xls'],
+//            ['Xlsx'],
+            ['Ods'],
+        ];
+    }
+
+    /**
+     * @dataProvider providerMergedCells
+     *
+     * @param string $format
+     */
+    public function testMergedCells($format)
+    {
+        $filename = tempnam(sys_get_temp_dir(), strtolower($format));
+        $this->writeMergedCells($filename, $format);
+        $actual = $this->readMergedCells($filename, $format);
+        unlink($filename);
+
+        self::assertSame(1, $actual, "Format $format failed, could not read 1 merged cell");
+    }
+
+    private function writeMergedCells($filename, $format)
+    {
+        $spreadsheet = new Spreadsheet();
+        $spreadsheet->setActiveSheetIndex(0);
+        $spreadsheet->getActiveSheet()->setCellValue('A1', '1');
+        $spreadsheet->getActiveSheet()->setCellValue('B1', '2');
+        $spreadsheet->getActiveSheet()->setCellValue('A2', '33');
+        $spreadsheet->getActiveSheet()->mergeCells('A2:B2');
+
+        $writer = IOFactory::createWriter($spreadsheet, $format);
+
+        $writer->save($filename);
+    }
+
+    private function readMergedCells($filename, $format)
+    {
+        $reader = IOFactory::createReader($format);
+        $spreadsheet = $reader->load($filename);
+        $n = 0;
+        foreach ($spreadsheet->getWorksheetIterator() as $worksheet) {
+            foreach ($worksheet->getMergeCells() as $cells) {
+                ++$n;
+            }
+        }
+
+        return $n;
+    }
+}