diff --git a/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java b/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
index e479c51..ac6615e 100644
--- a/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
+++ b/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
@@ -107,6 +107,9 @@ public class ValidationEditorController extends FXMLController {
     @FXML
     private CheckBox alphanumericRuleCheckBox;
 
+    @FXML
+    private CheckBox uniqueRuleCheckBox;
+
     @FXML
     private Spinner<Integer> minLengthSpinner;
 
@@ -155,6 +158,9 @@ public class ValidationEditorController extends FXMLController {
     @FXML
     private CheckBox enableGroovyRule;
 
+    @FXML
+    private CheckBox enableUniqueRule;
+
 
     @Value("${fxml.smartcvs.validation.editor.view}")
     @Override
@@ -172,6 +178,7 @@ public class ValidationEditorController extends FXMLController {
         initCheckBox(integerRuleCheckBox, enableIntegerRule);
         initCheckBox(doublerRuleCheckBox, enableDoubleRule);
         initCheckBox(alphanumericRuleCheckBox, enableAlphanumericRule);
+        initCheckBox(uniqueRuleCheckBox, enableUniqueRule);
         initSpinner(minLengthSpinner, enableMinLengthRule);
         initSpinner(maxLengthSpinner, enableMaxLengthRule);
         initTextInputControl(dateformatRuleTextField, enableDateRule);
@@ -214,6 +221,12 @@ public class ValidationEditorController extends FXMLController {
             validationConfiguration.setNotEmptyRuleFor(selectedColumn.getValue(), null);
         }
 
+        if (enableUniqueRule.isSelected()) {
+            validationConfiguration.setUniqueRuleFor(selectedColumn.getValue(), uniqueRuleCheckBox.isSelected());
+        } else {
+            validationConfiguration.setUniqueRuleFor(selectedColumn.getValue(), null);
+        }
+
         if (enableDoubleRule.isSelected()) {
             validationConfiguration.setDoubleRuleFor(selectedColumn.getValue(), doublerRuleCheckBox.isSelected());
         } else {
@@ -289,6 +302,12 @@ public class ValidationEditorController extends FXMLController {
                 enableAlphanumericRule
         );
 
+        updateCheckBox(
+                uniqueRuleCheckBox,
+                validationConfiguration.getUniqueRuleFor(getSelectedColumn()),
+                enableUniqueRule
+        );
+
         updateSpinner(
                 minLengthSpinner,
                 validationConfiguration.getMinLengthRuleFor(getSelectedColumn()),
diff --git a/src/main/java/ninja/javafx/smartcsv/validation/ValidationConfiguration.java b/src/main/java/ninja/javafx/smartcsv/validation/ValidationConfiguration.java
index a00da4b..3bbf172 100644
--- a/src/main/java/ninja/javafx/smartcsv/validation/ValidationConfiguration.java
+++ b/src/main/java/ninja/javafx/smartcsv/validation/ValidationConfiguration.java
@@ -52,7 +52,7 @@ public class ValidationConfiguration {
         headerConfiguration.setNames(headerNames);
     }
 
-    public Boolean getUniquenessRuleFor(String column) {
+    public Boolean getUniqueRuleFor(String column) {
         return (Boolean)getValue(column, "unique");
     }
 
@@ -114,6 +114,11 @@ public class ValidationConfiguration {
         setValue(column, value, "not empty");
     }
 
+    public void setUniqueRuleFor(String column, Boolean value) {
+        setValue(column, value, "unique");
+    }
+
+
     public void setMinLengthRuleFor(String column, Integer value) {
         setValue(column, value == null ? null : value.doubleValue(), "minlength");
     }
diff --git a/src/main/java/ninja/javafx/smartcsv/validation/Validator.java b/src/main/java/ninja/javafx/smartcsv/validation/Validator.java
index b604da8..2f6d999 100644
--- a/src/main/java/ninja/javafx/smartcsv/validation/Validator.java
+++ b/src/main/java/ninja/javafx/smartcsv/validation/Validator.java
@@ -32,7 +32,6 @@ import groovy.lang.Script;
 import org.codehaus.groovy.control.CompilationFailedException;
 
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 
@@ -112,7 +111,7 @@ public class Validator {
     ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
     private void checkUniqueness(String column, String value, Integer lineNumber, ValidationError error) {
-        if (validationConfig.getUniquenessRuleFor(column) != null && validationConfig.getUniquenessRuleFor(column)) {
+        if (validationConfig.getUniqueRuleFor(column) != null && validationConfig.getUniqueRuleFor(column)) {
             HashMap<String, Integer> columnValueMap = uniquenessLookupTable.get(column);
             columnValueMap = getColumnValueMap(column, columnValueMap);
             Integer valueInLineNumber = columnValueMap.get(value);
diff --git a/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv.properties b/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv.properties
index d3bc7c1..b47010a 100644
--- a/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv.properties
+++ b/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv.properties
@@ -71,6 +71,7 @@ validation.rule.label.groovy = groovy:
 validation.rules.active = active
 validation.rules.name = rule
 validation.rules.value = value
+validation.rule.label.unique = Unique in column:
 
 dialog.validation.rules.title = Validation rules
 dialog.validation.rules.header = Validation rules of column "{0}"
diff --git a/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv_de.properties b/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv_de.properties
index f677635..a13561b 100644
--- a/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv_de.properties
+++ b/src/main/resources/ninja/javafx/smartcsv/fx/smartcsv_de.properties
@@ -80,6 +80,7 @@ validation.rule.label.groovy = groovy:
 validation.rules.active = Aktiv
 validation.rules.name = Regel
 validation.rules.value = Wert
+validation.rule.label.unique = Einmalig in Spalte:
 
 dialog.validation.rules.title = Pr\u00fcfregeln
 dialog.validation.rules.header = Pr\u00fcfregeln f\u00fcr die Spalte "{0}"
diff --git a/src/main/resources/ninja/javafx/smartcsv/fx/validation/validationEditor.fxml b/src/main/resources/ninja/javafx/smartcsv/fx/validation/validationEditor.fxml
index d827480..201c598 100644
--- a/src/main/resources/ninja/javafx/smartcsv/fx/validation/validationEditor.fxml
+++ b/src/main/resources/ninja/javafx/smartcsv/fx/validation/validationEditor.fxml
@@ -1,17 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
+<?import java.net.URL?>
 <?import javafx.geometry.Insets?>
 <?import javafx.scene.control.CheckBox?>
 <?import javafx.scene.control.Label?>
 <?import javafx.scene.control.Spinner?>
-<?import javafx.scene.control.TextArea?>
 <?import javafx.scene.control.TextField?>
 <?import javafx.scene.layout.ColumnConstraints?>
 <?import javafx.scene.layout.GridPane?>
 <?import javafx.scene.layout.RowConstraints?>
-
 <?import org.fxmisc.richtext.CodeArea?>
-<?import java.net.URL?>
+
 <GridPane hgap="10.0" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefWidth="600.0" vgap="10.0" xmlns="http://javafx.com/javafx/8.0.101" xmlns:fx="http://javafx.com/fxml/1">
   <columnConstraints>
       <ColumnConstraints halignment="CENTER" hgrow="NEVER" maxWidth="50.0" prefWidth="50.0" />
@@ -31,41 +30,46 @@
       <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
       <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
       <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
+      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
   </rowConstraints>
    <children>
       <Label text="%validation.rule.label.not_empty" GridPane.columnIndex="1" GridPane.rowIndex="1" />
       <Label text="%validation.rule.label.integer" GridPane.columnIndex="1" GridPane.rowIndex="2" />
       <Label text="%validation.rule.label.double" GridPane.columnIndex="1" GridPane.rowIndex="3" />
-      <Label text="%validation.rule.label.minlength" GridPane.columnIndex="1" GridPane.rowIndex="5" />
-      <Label text="%validation.rule.label.maxlength" GridPane.columnIndex="1" GridPane.rowIndex="6" />
-      <Label text="%validation.rule.label.dateformat" GridPane.columnIndex="1" GridPane.rowIndex="7" />
+      <Label text="%validation.rule.label.minlength" GridPane.columnIndex="1" GridPane.rowIndex="6" />
+      <Label text="%validation.rule.label.maxlength" GridPane.columnIndex="1" GridPane.rowIndex="7" />
+      <Label text="%validation.rule.label.dateformat" GridPane.columnIndex="1" GridPane.rowIndex="8" />
       <Label text="%validation.rule.label.alphanumeric" GridPane.columnIndex="1" GridPane.rowIndex="4" />
-      <Label text="%validation.rule.label.regexp" GridPane.columnIndex="1" GridPane.rowIndex="8" />
-      <Label text="%validation.rule.label.value_of" GridPane.columnIndex="1" GridPane.rowIndex="9" />
-      <Label text="%validation.rule.label.groovy" GridPane.columnIndex="1" GridPane.rowIndex="10" />
+      <Label text="%validation.rule.label.regexp" GridPane.columnIndex="1" GridPane.rowIndex="9" />
+      <Label text="%validation.rule.label.value_of" GridPane.columnIndex="1" GridPane.rowIndex="10" />
+      <Label text="%validation.rule.label.groovy" GridPane.columnIndex="1" GridPane.rowIndex="11" />
+      <Label text="%validation.rule.label.unique" GridPane.columnIndex="1" GridPane.rowIndex="5" />
+       <CheckBox fx:id="enableNotEmptyRule" mnemonicParsing="false" GridPane.rowIndex="1" />
       <CheckBox fx:id="notEmptyRuleCheckBox" mnemonicParsing="false" GridPane.columnIndex="2" GridPane.rowIndex="1" />
+       <CheckBox fx:id="enableIntegerRule" mnemonicParsing="false" GridPane.rowIndex="2" />
       <CheckBox fx:id="integerRuleCheckBox" mnemonicParsing="false" GridPane.columnIndex="2" GridPane.rowIndex="2" />
+       <CheckBox fx:id="enableDoubleRule" mnemonicParsing="false" GridPane.rowIndex="3" />
       <CheckBox fx:id="doublerRuleCheckBox" mnemonicParsing="false" GridPane.columnIndex="2" GridPane.rowIndex="3" />
+       <CheckBox fx:id="enableAlphanumericRule" mnemonicParsing="false" GridPane.rowIndex="4" />
       <CheckBox fx:id="alphanumericRuleCheckBox" mnemonicParsing="false" GridPane.columnIndex="2" GridPane.rowIndex="4" />
-      <Spinner fx:id="minLengthSpinner" GridPane.columnIndex="2" GridPane.rowIndex="5" />
-      <Spinner fx:id="maxLengthSpinner" GridPane.columnIndex="2" GridPane.rowIndex="6" />
-      <TextField fx:id="dateformatRuleTextField" GridPane.columnIndex="2" GridPane.rowIndex="7" />
-      <TextField fx:id="regexpRuleTextField" GridPane.columnIndex="2" GridPane.rowIndex="8" />
-      <TextField fx:id="valueOfRuleTextField" GridPane.columnIndex="2" GridPane.rowIndex="9" />
-      <CodeArea fx:id="groovyRuleTextArea" prefHeight="300.0" prefWidth="200.0" GridPane.columnIndex="2" GridPane.rowIndex="10" GridPane.rowSpan="2" />
-      <CheckBox fx:id="enableNotEmptyRule" mnemonicParsing="false" GridPane.rowIndex="1" />
-      <CheckBox fx:id="enableIntegerRule" mnemonicParsing="false" GridPane.rowIndex="2" />
-      <CheckBox fx:id="enableDoubleRule" mnemonicParsing="false" GridPane.rowIndex="3" />
-      <CheckBox fx:id="enableAlphanumericRule" mnemonicParsing="false" GridPane.rowIndex="4" />
-      <CheckBox fx:id="enableMinLengthRule" mnemonicParsing="false" GridPane.rowIndex="5" />
-      <CheckBox fx:id="enableMaxLengthRule" mnemonicParsing="false" GridPane.rowIndex="6" />
-      <CheckBox fx:id="enableDateRule" mnemonicParsing="false" GridPane.rowIndex="7" />
-      <CheckBox fx:id="enableRegexpRule" mnemonicParsing="false" GridPane.rowIndex="8" />
-      <CheckBox fx:id="enableValueOfRule" mnemonicParsing="false" GridPane.rowIndex="9" />
-      <CheckBox fx:id="enableGroovyRule" mnemonicParsing="false" GridPane.rowIndex="10" />
+       <CheckBox fx:id="enableUniqueRule" mnemonicParsing="false" GridPane.rowIndex="5" />
+      <CheckBox fx:id="uniqueRuleCheckBox" mnemonicParsing="false" GridPane.columnIndex="2" GridPane.rowIndex="5" />
+       <CheckBox fx:id="enableMinLengthRule" mnemonicParsing="false" GridPane.rowIndex="6" />
+      <Spinner fx:id="minLengthSpinner" GridPane.columnIndex="2" GridPane.rowIndex="6" />
+       <CheckBox fx:id="enableMaxLengthRule" mnemonicParsing="false" GridPane.rowIndex="7" />
+      <Spinner fx:id="maxLengthSpinner" GridPane.columnIndex="2" GridPane.rowIndex="7" />
+       <CheckBox fx:id="enableDateRule" mnemonicParsing="false" GridPane.rowIndex="8" />
+      <TextField fx:id="dateformatRuleTextField" GridPane.columnIndex="2" GridPane.rowIndex="8" />
+       <CheckBox fx:id="enableRegexpRule" mnemonicParsing="false" GridPane.rowIndex="9" />
+      <TextField fx:id="regexpRuleTextField" GridPane.columnIndex="2" GridPane.rowIndex="9" />
+       <CheckBox fx:id="enableValueOfRule" mnemonicParsing="false" GridPane.rowIndex="10" />
+      <TextField fx:id="valueOfRuleTextField" GridPane.columnIndex="2" GridPane.rowIndex="10" />
+       <CheckBox fx:id="enableGroovyRule" mnemonicParsing="false" GridPane.rowIndex="11" />
+      <CodeArea fx:id="groovyRuleTextArea" prefHeight="300.0" prefWidth="200.0" GridPane.columnIndex="2" GridPane.rowIndex="11" GridPane.rowSpan="2" />
       <Label style="-fx-font-weight: bold;" text="%validation.rules.active" />
       <Label style="-fx-font-weight: bold;" text="%validation.rules.name" GridPane.columnIndex="1" />
       <Label style="-fx-font-weight: bold;" text="%validation.rules.value" GridPane.columnIndex="2" />
+
    </children>
    <padding>
       <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />