diff --git a/qwt/examples/stockchart/plot.cpp b/qwt/examples/stockchart/plot.cpp
index 5dc37c425..254b9533f 100644
--- a/qwt/examples/stockchart/plot.cpp
+++ b/qwt/examples/stockchart/plot.cpp
@@ -71,7 +71,7 @@ public:
     ZoneItem( const QString &title )
     {
         setTitle( title );
-        setZ( 11 ); // on top the the grid
+        setZ( 11 ); // on top the grid
         setOrientation( Qt::Vertical );
         setItemAttribute( QwtPlotItem::Legend, true );
     }
diff --git a/qwt/src/qwt_plot_layout.cpp b/qwt/src/qwt_plot_layout.cpp
index f4418566e..d195a29eb 100644
--- a/qwt/src/qwt_plot_layout.cpp
+++ b/qwt/src/qwt_plot_layout.cpp
@@ -1177,7 +1177,7 @@ void QwtPlotLayout::setAlignCanvasToScales( bool on )
 
   The axisId parameter is somehow confusing as it identifies a border
   of the plot and not the axes, that are aligned. F.e when QwtAxis::yLeft
-  is set, the left end of the the x-axes ( QwtAxis::xTop, QwtAxis::xBottom )
+  is set, the left end of the x-axes ( QwtAxis::xTop, QwtAxis::xBottom )
   is aligned.
 
   \param axisId Axis index
diff --git a/qwt/src/qwt_plot_textlabel.cpp b/qwt/src/qwt_plot_textlabel.cpp
index a9e19644c..2e35e569d 100644
--- a/qwt/src/qwt_plot_textlabel.cpp
+++ b/qwt/src/qwt_plot_textlabel.cpp
@@ -243,7 +243,7 @@ void QwtPlotTextLabel::draw( QPainter *painter,
    \param rect Canvas rectangle with margins subtracted
    \param textSize Size required to draw the text
 
-   \return A rectangle aligned according the the alignment flags of
+   \return A rectangle aligned according the alignment flags of
            the text.
 
    \sa setMargin(), QwtText::renderFlags(), QwtText::textSize()
diff --git a/qwt/src/qwt_plot_zoomer.cpp b/qwt/src/qwt_plot_zoomer.cpp
index 1f2e81c8c..7bd0a75b4 100644
--- a/qwt/src/qwt_plot_zoomer.cpp
+++ b/qwt/src/qwt_plot_zoomer.cpp
@@ -452,7 +452,7 @@ void QwtPlotZoomer::moveBy( double dx, double dy )
 }
 
 /*!
-  Move the the current zoom rectangle.
+  Move the current zoom rectangle.
 
   \param pos New position
 
diff --git a/qwt/src/qwt_scale_widget.cpp b/qwt/src/qwt_scale_widget.cpp
index d34ada52a..23b528a35 100644
--- a/qwt/src/qwt_scale_widget.cpp
+++ b/qwt/src/qwt_scale_widget.cpp
@@ -451,7 +451,7 @@ void QwtScaleWidget::draw( QPainter *painter ) const
 }
 
 /*!
-  Calculate the the rectangle for the color bar
+  Calculate the rectangle for the color bar
 
   \param rect Bounding rectangle for all components of the scale
   \return Rectangle for the color bar
diff --git a/qwt/src/qwt_series_data.h b/qwt/src/qwt_series_data.h
index afd8b1ae9..eda3ec7fd 100644
--- a/qwt/src/qwt_series_data.h
+++ b/qwt/src/qwt_series_data.h
@@ -267,7 +267,7 @@ QWT_EXPORT QRectF qwtBoundingRect(
     Binary search for a sorted series of samples
 
     qwtUpperSampleIndex returns the index of sample that is the upper bound
-    of value. Is the the value smaller than the smallest value the return
+    of value. Is the value smaller than the smallest value the return
     value will be 0. Is the value greater or equal than the largest
     value the return value will be -1.
 
diff --git a/qwt/src/qwt_series_store.h b/qwt/src/qwt_series_store.h
index cb841a498..fe78d469c 100644
--- a/qwt/src/qwt_series_store.h
+++ b/qwt/src/qwt_series_store.h
@@ -75,10 +75,10 @@ public:
     */
     void setData( QwtSeriesData<T> *series );
 
-    //! \return the the series data
+    //! \return the series data
     QwtSeriesData<T> *data();
 
-    //! \return the the series data
+    //! \return the series data
     const QwtSeriesData<T> *data() const;
 
     /*!
diff --git a/qwt/src/qwt_slider.cpp b/qwt/src/qwt_slider.cpp
index e4e394268..d431145f4 100644
--- a/qwt/src/qwt_slider.cpp
+++ b/qwt/src/qwt_slider.cpp
@@ -125,7 +125,7 @@ QwtSlider::QwtSlider( QWidget *parent ):
   Construct a slider in QwtSlider::Trough style
 
   When orientation is Qt::Vertical the scale will be aligned to
-  the left - otherwise at the the top of the slider.
+  the left - otherwise at the top of the slider.
 
   The scale is initialized to [0.0, 100.0] and the value set to 0.0.
 
diff --git a/qwt/src/qwt_symbol.h b/qwt/src/qwt_symbol.h
index ea16d885f..13d4a914f 100644
--- a/qwt/src/qwt_symbol.h
+++ b/qwt/src/qwt_symbol.h
@@ -132,7 +132,7 @@ public:
 
       F.e. the raster paint engine is a pure software renderer
       where in cache mode a draw operation usually ends in 
-      raster operation with the the backing store, that are usually
+      raster operation with the backing store, that are usually
       faster, than the algorithms for rendering polygons.
       But the opposite can be expected for graphic pipelines
       that can make use of hardware acceleration.
diff --git a/src/FileIO/CsvRideFile.cpp b/src/FileIO/CsvRideFile.cpp
index 4aebcac75..599095083 100644
--- a/src/FileIO/CsvRideFile.cpp
+++ b/src/FileIO/CsvRideFile.cpp
@@ -219,7 +219,7 @@ RideFile *CsvFileReader::openRideFile(QFile &file, QStringList &errors, QList<Ri
     bool eof = false;
     while (!is.atEnd() && !eof) {
         // the readLine() method doesn't handle old Macintosh CR line endings
-        // this workaround will load the the entire file if it has CR endings
+        // this workaround will load the entire file if it has CR endings
         // then split and loop through each line
         // otherwise, there will be nothing to split and it will read each line as expected.
         QString linesIn = is.readLine();
diff --git a/src/FileIO/ManualRideFile.cpp b/src/FileIO/ManualRideFile.cpp
index 7c0d01e31..bf9ac5af1 100644
--- a/src/FileIO/ManualRideFile.cpp
+++ b/src/FileIO/ManualRideFile.cpp
@@ -56,7 +56,7 @@ RideFile *ManualFileReader::openRideFile(QFile &file, QStringList &errors, QList
     RideFile *rideFile = new RideFile();
     while (!is.atEnd()) {
 	// the readLine() method doesn't handle old Macintosh CR line endings
-	// this workaround will load the the entire file if it has CR endings
+	// this workaround will load the entire file if it has CR endings
 	// then split and loop through each line
 	// otherwise, there will be nothing to split and it will read each line as expected.
 	QString linesIn = is.readLine();
diff --git a/src/FileIO/PolarRideFile.cpp b/src/FileIO/PolarRideFile.cpp
index 4d17775fd..2484193ff 100644
--- a/src/FileIO/PolarRideFile.cpp
+++ b/src/FileIO/PolarRideFile.cpp
@@ -63,7 +63,7 @@ bool ScanPddFile(QFile &file, QString &hrmFile, QString &hrvFile, QString &gpxFi
 
   while (!is.atEnd()) {
     // the readLine() method doesn't handle old Macintosh CR line
-    // endings this workaround will load the the entire file if it
+    // endings this workaround will load the entire file if it
     // has CR endings then split and loop through each line
     // otherwise, there will be nothing to split and it will read
     // each line as expected.
@@ -212,7 +212,7 @@ void HrmRideFile(RideFile *rideFile, RideFile*gpxresult, bool haveGPX, XDataSeri
 
   while (!is.atEnd()) {
     // the readLine() method doesn't handle old Macintosh CR line
-    // endings this workaround will load the the entire file if it
+    // endings this workaround will load the entire file if it
     // has CR endings then split and loop through each line
     // otherwise, there will be nothing to split and it will read
     // each line as expected.
diff --git a/src/FileIO/TxtRideFile.cpp b/src/FileIO/TxtRideFile.cpp
index d5b217cad..54a39e13b 100644
--- a/src/FileIO/TxtRideFile.cpp
+++ b/src/FileIO/TxtRideFile.cpp
@@ -155,7 +155,7 @@ RideFile *TxtFileReader::openRideFile(QFile &file, QStringList &errors, QList<Ri
         while (!is.atEnd()) {
 
             // the readLine() method doesn't handle old Macintosh CR line endings
-            // this workaround will load the the entire file if it has CR endings
+            // this workaround will load the entire file if it has CR endings
             // then split and loop through each line
             // otherwise, there will be nothing to split and it will read each line as expected.
             QString linesIn = is.readLine();
diff --git a/src/Gui/SearchBox.cpp b/src/Gui/SearchBox.cpp
index bc9329cc1..4557a727a 100644
--- a/src/Gui/SearchBox.cpp
+++ b/src/Gui/SearchBox.cpp
@@ -456,7 +456,7 @@ SearchBox::addNamed()
 }
 
 //
-// Working with the the autocompleter
+// Working with the autocompleter
 //
 void SearchBox::setCompleter(DataFilterCompleter *completer)
 {
diff --git a/src/Train/ErgFile.cpp b/src/Train/ErgFile.cpp
index 05bbb2d25..c357af421 100644
--- a/src/Train/ErgFile.cpp
+++ b/src/Train/ErgFile.cpp
@@ -396,7 +396,7 @@ void ErgFile::parseComputrainer(QString p)
 
         // Code plagiarised from CsvRideFile.
         // the readLine() method doesn't handle old Macintosh CR line endings
-        // this workaround will load the the entire file if it has CR endings
+        // this workaround will load the entire file if it has CR endings
         // then split and loop through each line
         // otherwise, there will be nothing to split and it will read each line as expected.
         QString linesIn = (p != "" ? stringStream.readLine() : ergFile.readLine());