diff --git a/src/core/datatypes.h b/src/core/datatypes.h
index 08f4b71..1cb42c5 100644
--- a/src/core/datatypes.h
+++ b/src/core/datatypes.h
@@ -37,4 +37,12 @@ enum UIElementer {
     FIRMANAVN
 };
 
+enum CustomerFilters {
+    ID,
+    NAME,
+    COMPANYNAME,
+    PHONE,
+    EMAIL
+};
+
 #endif // DATATYPES_H
diff --git a/src/core/mainwindow.cpp b/src/core/mainwindow.cpp
index 2975e30..5d1ea79 100644
--- a/src/core/mainwindow.cpp
+++ b/src/core/mainwindow.cpp
@@ -517,6 +517,7 @@ void MainWindow::on_commandCustomers_clicked() {
         connect(kundeW, SIGNAL(redigerKunde(int)), this, SLOT(visRedigerKundeDlg(int)));
         connect(kundeW, SIGNAL(slettKunde(int)), this, SLOT(slettKunde(int)));
         connect(kundeW, SIGNAL(tilordneProsjekt(int)), this, SLOT(visProsjektListe(int)));
+        connect(kundeW, SIGNAL(startSok(QString)), this, SLOT(kundeSok(QString)));
 
         ui->hovedLayout->insertWidget(0, kundeW);
         kundeW->lagKundeTabell(kundeKart);
@@ -986,6 +987,19 @@ void MainWindow::knyttProsjekt(int kunde, int prosjekt) {
     QMessageBox::information(this, "Tilknyttet", tr("Kunde med kundenummer %1 er tilknyttet prosjekt med ordrenummer %2").arg(kunde).arg(prosjekt));
 }
 
+/* kundeSok():
+ * --------------------------------------
+ *
+ * Tegner kundetabellen på ny med filteret i Qstring
+ */
+
+void MainWindow::kundeSok(QString sok) {
+    if (sok.isEmpty())
+        kundeW->lagKundeTabell(kundeKart);
+    else
+        kundeW->lagKundeTabell(kundeKart, true, sok);
+}
+
 /* on_action_Innstillinger_triggered():
  * --------------------------------------
  *
diff --git a/src/core/mainwindow.h b/src/core/mainwindow.h
index c12a5c2..28d9aa9 100644
--- a/src/core/mainwindow.h
+++ b/src/core/mainwindow.h
@@ -56,6 +56,7 @@ private slots:
     void slettKunde(int posisjon);
     void visProsjektListe(int posisjon);
     void knyttProsjekt(int kunde, int prosjekt);
+    void kundeSok(QString sok);
 
     /* Prosjektslots */
     void on_commandProsjekter_clicked();
diff --git a/src/mainwidgets/kundewidget.cpp b/src/mainwidgets/kundewidget.cpp
index 7a8295c..008618c 100644
--- a/src/mainwidgets/kundewidget.cpp
+++ b/src/mainwidgets/kundewidget.cpp
@@ -5,13 +5,15 @@ KundeWidget::KundeWidget(QWidget *parent) :
     QWidget(parent),
     ui(new Ui::KundeWidget) {
     ui->setupUi(this);
+
+    filterFelt = CustomerFilters::ID;
 }
 
 KundeWidget::~KundeWidget() {
     delete ui;
 }
 
-void KundeWidget::lagKundeTabell(KundeKartotek &kundeKart) {
+void KundeWidget::lagKundeTabell(KundeKartotek &kundeKart, bool filtrer, QString filter) {
     ui->kundeTabell->clear();
 
     connect(ui->kundeTabell, SIGNAL(itemClicked(QTableWidgetItem*)), this, SLOT(celleKlikk(QTableWidgetItem*)));
@@ -24,6 +26,49 @@ void KundeWidget::lagKundeTabell(KundeKartotek &kundeKart) {
         }
     }
 
+    // Hvis filtrer er sann, opprett nytt kundekartotek kalt "filtrertKartotek" og iterer igjennom aktivKartotek for dermed å legge til
+    // felter som kun passer med filteret. Sett dermed "aktivKartotek" til det filtrerte kartoteket ("filtrertKartotek")
+    if (filtrer) {
+        KundeKartotek filtrertKartotek;
+        for (int i = 0; i < aktivKartotek.size(); ++i) {
+            switch (filterFelt) {
+                case CustomerFilters::ID: {
+                    if (aktivKartotek.at(i).value("id").toString().contains(filter)) {
+                        kopierKartotekFelt(aktivKartotek.at(i), filtrertKartotek);
+                    }
+                    break;
+                }
+                case CustomerFilters::NAME: {
+                    QString fulltNavn = aktivKartotek.at(i).value("fornavn").toString() + " " + aktivKartotek.at(i).value("etternavn").toString();
+                    if (fulltNavn.contains(filter, Qt::CaseSensitive)) {
+                        kopierKartotekFelt(aktivKartotek.at(i), filtrertKartotek);
+                    }
+                    break;
+                }
+                case CustomerFilters::COMPANYNAME: {
+                    if (aktivKartotek.at(i).value("firmanavn").toString().contains(filter, Qt::CaseSensitive)) {
+                        kopierKartotekFelt(aktivKartotek.at(i), filtrertKartotek);
+                    }
+                    break;
+                }
+                case CustomerFilters::PHONE: {
+                    if (aktivKartotek.at(i).value("tlf").toString().contains(filter)) {
+                        kopierKartotekFelt(aktivKartotek.at(i), filtrertKartotek);
+                    }
+                    break;
+                }
+                case CustomerFilters::EMAIL: {
+                    if (aktivKartotek.at(i).value("epost").toString().contains(filter)) {
+                        kopierKartotekFelt(aktivKartotek.at(i), filtrertKartotek);
+                    }
+                    break;
+                }
+            }
+        }
+
+        aktivKartotek = filtrertKartotek;
+    }
+
     QStringList overskrifter;
     overskrifter << tr("Kundenummer") << tr("Fornavn") << tr("Etternavn") << tr("Firmanavn") << tr("Telefonnr") << tr("Epostadresse");
     ui->kundeTabell->setRowCount(aktivKartotek.size());
@@ -93,3 +138,46 @@ void KundeWidget::on_pushProsjekt_clicked() {
     emit tilordneProsjekt(kundeNummer);
 }
 
+
+void KundeWidget::on_radioSokKundeNummer_clicked() {
+    ui->lineSok->clear();
+    ui->lineSok->setFocus();
+    filterFelt = CustomerFilters::ID;
+}
+
+
+void KundeWidget::on_radioSokIFornavn_clicked() {
+    ui->lineSok->clear();
+    ui->lineSok->setFocus();
+    filterFelt = CustomerFilters::NAME;
+}
+
+
+void KundeWidget::on_radioSokIFirma_clicked() {
+    ui->lineSok->clear();
+    ui->lineSok->setFocus();
+    filterFelt = CustomerFilters::COMPANYNAME;
+}
+
+
+void KundeWidget::on_radioSokITlf_clicked() {
+    ui->lineSok->clear();
+    ui->lineSok->setFocus();
+    filterFelt = CustomerFilters::PHONE;
+}
+
+
+void KundeWidget::on_radioSokIEpost_clicked() {
+    ui->lineSok->clear();
+    ui->lineSok->setFocus();
+    filterFelt = CustomerFilters::EMAIL;
+}
+
+
+void KundeWidget::on_lineSok_textChanged(const QString &arg1) {
+    emit startSok(arg1);
+}
+
+void KundeWidget::kopierKartotekFelt(KundeFil kilde, KundeKartotek &maal) {
+    maal << kilde;
+}
diff --git a/src/mainwidgets/kundewidget.h b/src/mainwidgets/kundewidget.h
index a7692da..8fed9cd 100644
--- a/src/mainwidgets/kundewidget.h
+++ b/src/mainwidgets/kundewidget.h
@@ -2,7 +2,10 @@
 #define KUNDEWIDGET_H
 
 #include <QWidget>
+#include <QTableWidget>
 #include <QTableWidgetItem>
+#include <QRegularExpression>
+#include <QRegularExpressionMatch>
 
 #include "datahandler.h"
 #include "datatypes.h"
@@ -19,13 +22,14 @@ public:
     explicit KundeWidget(QWidget *parent = nullptr);
     ~KundeWidget();
 
-    void lagKundeTabell(KundeKartotek &kundeKart);
+    void lagKundeTabell(KundeKartotek &kundeKart, bool filtrer = false, QString filter = QString());
 
 signals:
     void opprettKunde();
     void redigerKunde(int posisjon);
     void slettKunde(int posisjon);
     void tilordneProsjekt(int posisjon);
+    void startSok(QString soekeStreng);
 
 private slots:
     void on_pushNyKunde_clicked();
@@ -33,10 +37,18 @@ private slots:
     void on_pushRediger_clicked();
     void on_pushSlett_clicked();   
     void on_pushProsjekt_clicked();
+    void on_radioSokKundeNummer_clicked();
+    void on_radioSokIFornavn_clicked();
+    void on_radioSokIFirma_clicked();
+    void on_radioSokITlf_clicked();
+    void on_radioSokIEpost_clicked();
+    void on_lineSok_textChanged(const QString &arg1);
 
 private:
     Ui::KundeWidget *ui;
     int kundeNummer;
+    CustomerFilters filterFelt;
+    void kopierKartotekFelt(KundeFil kilde, KundeKartotek &maal);
 };
 
 #endif // KUNDEWIDGET_H
diff --git a/src/mainwidgets/kundewidget.ui b/src/mainwidgets/kundewidget.ui
index 9e0184e..c3b298a 100644
--- a/src/mainwidgets/kundewidget.ui
+++ b/src/mainwidgets/kundewidget.ui
@@ -6,14 +6,14 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>543</width>
-    <height>499</height>
+    <width>532</width>
+    <height>378</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Form</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
+  <layout class="QVBoxLayout" name="verticalLayout_2">
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
@@ -58,6 +58,115 @@
      </item>
     </layout>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_6">
+     <item>
+      <spacer name="horizontalSpacer_7">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_4">
+         <item>
+          <widget class="QLabel" name="labelSok">
+           <property name="font">
+            <font>
+             <weight>75</weight>
+             <bold>true</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string>Søk:</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLineEdit" name="lineSok"/>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_5">
+         <item>
+          <widget class="QLabel" name="labelSokI">
+           <property name="font">
+            <font>
+             <weight>75</weight>
+             <bold>true</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string>Søk i:</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioSokKundeNummer">
+           <property name="text">
+            <string>Kundenummer</string>
+           </property>
+           <property name="checked">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioSokIFornavn">
+           <property name="text">
+            <string>Navn</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioSokIFirma">
+           <property name="text">
+            <string>Firma</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioSokITlf">
+           <property name="text">
+            <string>Telefon</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QRadioButton" name="radioSokIEpost">
+           <property name="text">
+            <string>Epost</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_8">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
    <item>
     <widget class="QTableWidget" name="kundeTabell">
      <attribute name="verticalHeaderVisible">