diff --git a/Applications/DataExplorer/Base/CheckboxDelegate.cpp b/Applications/DataExplorer/Base/CheckboxDelegate.cpp
index dd2c9988aebdbf85c6f9b2cd7e4ff98554791180..696c722b9189b80c855e5c67827fe01eb2025edb 100644
--- a/Applications/DataExplorer/Base/CheckboxDelegate.cpp
+++ b/Applications/DataExplorer/Base/CheckboxDelegate.cpp
@@ -21,8 +21,6 @@
 #include <QPainter>
 #include <QStyleOptionButton>
 
-#include <iostream>
-
 CheckboxDelegate::CheckboxDelegate(QObject* parent)
     : QItemDelegate(parent)
 {
diff --git a/Applications/DataExplorer/Base/QValueTooltipSlider.cpp b/Applications/DataExplorer/Base/QValueTooltipSlider.cpp
index 78d4e19d1339bee540d60365a380070676831aff..a63b2d26f14704b7d46b02fbb92034eb9b355623 100644
--- a/Applications/DataExplorer/Base/QValueTooltipSlider.cpp
+++ b/Applications/DataExplorer/Base/QValueTooltipSlider.cpp
@@ -19,8 +19,6 @@
 #include <QString>
 #include <QToolTip>
 
-#include <iostream>
-
 QValueTooltipSlider::QValueTooltipSlider(QWidget* parent)
     : QSlider(parent)
 {
diff --git a/Applications/DataExplorer/DataView/GeoTreeView.cpp b/Applications/DataExplorer/DataView/GeoTreeView.cpp
index 43b5bad1e7a80dd76fff203e729efd25661026a1..fce20c5189265187a7daef8eb415eb9b951875b9 100644
--- a/Applications/DataExplorer/DataView/GeoTreeView.cpp
+++ b/Applications/DataExplorer/DataView/GeoTreeView.cpp
@@ -15,7 +15,6 @@
 #include <QFileDialog>
 #include <QMenu>
 #include <QSettings>
-#include <iostream>
 
 #include "GeoObjectListItem.h"
 #include "GeoTreeItem.h"
diff --git a/Applications/DataExplorer/DataView/StationTreeView.cpp b/Applications/DataExplorer/DataView/StationTreeView.cpp
index 4ab81df0a81ea4b8eecb58f77620e451a0df1ab4..80d5d196144a6cd7fb586e0bd0167571e1393080 100644
--- a/Applications/DataExplorer/DataView/StationTreeView.cpp
+++ b/Applications/DataExplorer/DataView/StationTreeView.cpp
@@ -14,7 +14,6 @@
 
 #include <QFileDialog>
 #include <QMenu>
-#include <iostream>
 
 #include "GMSInterface.h"
 #include "Station.h"
diff --git a/Applications/DataExplorer/VtkVis/VtkRaster.cpp b/Applications/DataExplorer/VtkVis/VtkRaster.cpp
index f36c8418d3ebc9857b44547e0d07537177ec52a8..c3f03ca787369413468b7745cd0e22a6591ad17a 100644
--- a/Applications/DataExplorer/VtkVis/VtkRaster.cpp
+++ b/Applications/DataExplorer/VtkVis/VtkRaster.cpp
@@ -16,7 +16,6 @@
 
 #include <algorithm>
 #include <cmath>
-#include <iostream>
 #include <limits>
 
 #include <QFileInfo>
diff --git a/Applications/Utils/FileConverter/ConvertSHPToGLI.cpp b/Applications/Utils/FileConverter/ConvertSHPToGLI.cpp
index 9d87af4e1e16e6b8b777d7e3ceabb5d3f1685424..65465ae5205dae8f0b61be3669dddacec7b92b15 100644
--- a/Applications/Utils/FileConverter/ConvertSHPToGLI.cpp
+++ b/Applications/Utils/FileConverter/ConvertSHPToGLI.cpp
@@ -14,7 +14,6 @@
 
 // STL
 #include <fstream>
-#include <iostream>
 #include <vector>
 
 #include <tclap/CmdLine.h>
diff --git a/Applications/Utils/FileConverter/ConvertVtkToOsg.cpp b/Applications/Utils/FileConverter/ConvertVtkToOsg.cpp
index f14b37c0b3c23e5784a22e2f8ae4bbce68b6c126..fc2b4b6e245068328c086f2a99d325ecb5b7a776 100644
--- a/Applications/Utils/FileConverter/ConvertVtkToOsg.cpp
+++ b/Applications/Utils/FileConverter/ConvertVtkToOsg.cpp
@@ -15,8 +15,6 @@
 // ** INCLUDES **
 #include "VtkOsgConverter.h"
 
-#include <iostream>
-
 #include <vtkActor.h>
 #include <vtkDataSetMapper.h>
 #include <vtkGenericDataObjectReader.h>
diff --git a/AssemblerLib/ComponentGlobalIndexDict.h b/AssemblerLib/ComponentGlobalIndexDict.h
index eabb3d60027faa877ba5501d1eb1e03b5839b79a..21ff6dd89aaf1f62ec0e465d2184edffd3bc27bd 100644
--- a/AssemblerLib/ComponentGlobalIndexDict.h
+++ b/AssemblerLib/ComponentGlobalIndexDict.h
@@ -13,7 +13,6 @@
 #ifndef ASSEMBLERLIB_COMPONENTGLOBALINDEXDICT_H_
 #define ASSEMBLERLIB_COMPONENTGLOBALINDEXDICT_H_
 
-#include <iostream>
 #include <limits>
 
 #include <boost/multi_index/composite_key.hpp>
diff --git a/BaseLib/DateTools.cpp b/BaseLib/DateTools.cpp
index 14624941badde4efb6dde4871a6353c04dacc7db..6de1ddb7dd5144c42ce8e5a83fa9a029e606f876 100644
--- a/BaseLib/DateTools.cpp
+++ b/BaseLib/DateTools.cpp
@@ -16,7 +16,6 @@
 
 #include <cmath>
 #include <cstdlib>
-#include <iostream>
 #include <sstream>
 
 // ThirdParty/logog
diff --git a/BaseLib/MemWatch.cpp b/BaseLib/MemWatch.cpp
index 79477664314bea6a5a7cdae4f1d68c8e69c7e3e3..953f4e84b2e80ec05487a1c7e5731ed41535cca6 100644
--- a/BaseLib/MemWatch.cpp
+++ b/BaseLib/MemWatch.cpp
@@ -15,7 +15,6 @@
 #include "MemWatch.h"
 
 #if !defined(WIN32) && !defined(__APPLE__) && !defined(__MINGW32__)
-#include <iostream>
 #include <fstream>
 #include <string>
 #include <sstream>
diff --git a/GeoLib/LineSegment.cpp b/GeoLib/LineSegment.cpp
index 66f57c45436c869cdba26b7705c651a2bc6545da..e0d3adbd2d83a399859a1b776417d5b145b52675 100644
--- a/GeoLib/LineSegment.cpp
+++ b/GeoLib/LineSegment.cpp
@@ -9,8 +9,6 @@
 
 #include "LineSegment.h"
 
-#include <iostream>
-
 namespace GeoLib
 {
 LineSegment::LineSegment(Point* const a, Point* const b,
diff --git a/MathLib/LinAlg/Dense/DenseMatrix.h b/MathLib/LinAlg/Dense/DenseMatrix.h
index 0b80dc1e3f49a005ec1ff0b5e24a1c96748c256d..b030a92dd935b35cb835ff1e4186a9cd81b35b60 100644
--- a/MathLib/LinAlg/Dense/DenseMatrix.h
+++ b/MathLib/LinAlg/Dense/DenseMatrix.h
@@ -18,7 +18,6 @@
 #include <new>
 #include <exception>
 #include <stdexcept>
-#include <iostream>
 
 #include "MathLib/Vector3.h"
 
diff --git a/MeshLib/MeshQuality/ElementQualityMetric.cpp b/MeshLib/MeshQuality/ElementQualityMetric.cpp
index 25f29dfcc76774bb74dca953e8d7834584a57cda..c80d6a1c3ea23f734c7f5107698184ee917c12d3 100644
--- a/MeshLib/MeshQuality/ElementQualityMetric.cpp
+++ b/MeshLib/MeshQuality/ElementQualityMetric.cpp
@@ -15,7 +15,6 @@
 #include "ElementQualityMetric.h"
 
 #include <cmath>
-#include <iostream>
 
 #include "GeoLib/Point.h"
 #include "MeshLib/Node.h"
diff --git a/Tests/AssemblerLib/LocalToGlobalIndexMapMultiComponent.cpp b/Tests/AssemblerLib/LocalToGlobalIndexMapMultiComponent.cpp
index 53e657449aee621f40c0c372fdea7e70d769b8a7..0184d26fc2efa95fe60bc2818a190b91a1561be0 100644
--- a/Tests/AssemblerLib/LocalToGlobalIndexMapMultiComponent.cpp
+++ b/Tests/AssemblerLib/LocalToGlobalIndexMapMultiComponent.cpp
@@ -23,8 +23,6 @@
 #include "MeshGeoToolsLib/MeshNodeSearcher.h"
 #include "MeshGeoToolsLib/BoundaryElementsSearcher.h"
 
-#include <iostream>
-
 namespace AL = AssemblerLib;
 namespace MeL = MeshLib;
 namespace MGTL = MeshGeoToolsLib;
diff --git a/Tests/GeoLib/TestAABB.cpp b/Tests/GeoLib/TestAABB.cpp
index 4e435ab5e4ea128defc63c5bedea76f827c32721..a52feb960c3c4e709dfa000e76bf71f6bd12274e 100644
--- a/Tests/GeoLib/TestAABB.cpp
+++ b/Tests/GeoLib/TestAABB.cpp
@@ -15,7 +15,6 @@
 #include <cstdlib>
 #include <ctime>
 #include <list>
-#include <iostream>
 #include <random>
 
 #include "gtest/gtest.h"
diff --git a/Tests/MathLib/TestEigenCSR.cpp b/Tests/MathLib/TestEigenCSR.cpp
index 6871585c5d7631619ff8dbb03060b0447486e3c1..8a5677dd37f237ad6b536a2e7467b6653dd9c2d4 100644
--- a/Tests/MathLib/TestEigenCSR.cpp
+++ b/Tests/MathLib/TestEigenCSR.cpp
@@ -9,8 +9,6 @@
 
 #include <gtest/gtest.h>
 
-#include <iostream>
-
 #include <vector>
 #include <numeric>
 
diff --git a/Tests/MeshLib/TestQuadMesh.cpp b/Tests/MeshLib/TestQuadMesh.cpp
index 7d79e7d8581231a67b8bf7d7e2093508abeae3ed..07dc24c7ab593c04196184bd738738420ff865d6 100644
--- a/Tests/MeshLib/TestQuadMesh.cpp
+++ b/Tests/MeshLib/TestQuadMesh.cpp
@@ -7,7 +7,6 @@
  */
 
 #include <ctime>
-#include <iostream>
 #include <iterator>
 #include "gtest/gtest.h"
 
diff --git a/Tests/MeshLib/TestTriLineMesh.cpp b/Tests/MeshLib/TestTriLineMesh.cpp
index 1f97f9dac243cf9803de8404572860d2d98fa83d..afb1d30b05de4812b59781b3c9e74156372432d2 100644
--- a/Tests/MeshLib/TestTriLineMesh.cpp
+++ b/Tests/MeshLib/TestTriLineMesh.cpp
@@ -6,7 +6,6 @@
  *              http://www.opengeosys.org/LICENSE.txt
  */
 
-#include <iostream>
 #include "gtest/gtest.h"
 
 #include "MeshLib/Mesh.h"
diff --git a/Tests/NumLib/ODEs.h b/Tests/NumLib/ODEs.h
index c8b07dd18679500e8f06feb2be5225c1dc346158..b693bf6efdbefa6aa5f65dae1bdd477fa83d8cb6 100644
--- a/Tests/NumLib/ODEs.h
+++ b/Tests/NumLib/ODEs.h
@@ -15,7 +15,7 @@
 #include "NumLib/ODESolver/ODESystem.h"
 
 // debug
-#include <iostream>
+//#include <iostream>
 
 
 template<typename Matrix, typename Vector,