diff --git a/gui/include/Variable/RenameVariableDialog.h b/gui/include/Variable/RenameVariableDialog.h
new file mode 100644
index 0000000..e3f503c
--- /dev/null
+++ b/gui/include/Variable/RenameVariableDialog.h
@@ -0,0 +1,31 @@
+#ifndef SCIQLOP_RENAMEVARIABLEDIALOG_H
+#define SCIQLOP_RENAMEVARIABLEDIALOG_H
+
+#include <QDialog>
+
+namespace Ui {
+class RenameVariableDialog;
+} // Ui
+
+/**
+ * @brief The RenameVariableDialog class represents the dialog to rename a variable
+ */
+class RenameVariableDialog : public QDialog {
+public:
+    explicit RenameVariableDialog(const QString &defaultName,
+                                  const QVector<QString> &forbiddenNames,
+                                  QWidget *parent = nullptr);
+    virtual ~RenameVariableDialog() noexcept;
+
+    QString name() const noexcept;
+
+public slots:
+    void accept() override;
+
+private:
+    Ui::RenameVariableDialog *ui;
+    QString m_DefaultName;
+    QVector<QString> m_ForbiddenNames;
+};
+
+#endif // SCIQLOP_RENAMEVARIABLEDIALOG_H
diff --git a/gui/src/Variable/RenameVariableDialog.cpp b/gui/src/Variable/RenameVariableDialog.cpp
new file mode 100644
index 0000000..1af8af5
--- /dev/null
+++ b/gui/src/Variable/RenameVariableDialog.cpp
@@ -0,0 +1,63 @@
+#include "Variable/RenameVariableDialog.h"
+
+#include <ui_RenameVariableDialog.h>
+
+RenameVariableDialog::RenameVariableDialog(const QString &defaultName,
+                                           const QVector<QString> &forbiddenNames, QWidget *parent)
+        : QDialog{parent},
+          ui{new Ui::RenameVariableDialog},
+          m_DefaultName{defaultName},
+          m_ForbiddenNames{forbiddenNames}
+{
+    ui->setupUi(this);
+
+    connect(ui->nameLineEdit, &QLineEdit::textChanged, [this]() { ui->errorLabel->hide(); });
+
+    ui->nameLineEdit->setText(defaultName);
+    ui->nameLineEdit->selectAll();
+    ui->nameLineEdit->setFocus();
+}
+
+RenameVariableDialog::~RenameVariableDialog() noexcept
+{
+    delete ui;
+}
+
+QString RenameVariableDialog::name() const noexcept
+{
+    return ui->nameLineEdit->text();
+}
+
+void RenameVariableDialog::accept()
+{
+    auto invalidateInput = [this](const auto &error) {
+        ui->nameLineEdit->selectAll();
+        ui->nameLineEdit->setFocus();
+        ui->errorLabel->setText(error);
+        ui->errorLabel->show();
+    };
+
+    // Empty name
+    auto name = ui->nameLineEdit->text();
+    if (name.isEmpty()) {
+        invalidateInput(tr("A variable name must be specified"));
+        return;
+    }
+
+    // Same name when opening dialog
+    if (name.compare(m_DefaultName, Qt::CaseInsensitive) == 0) {
+        reject();
+        return;
+    }
+
+    // Forbidden name
+    auto isForbidden
+        = [&name](const auto &it) { return name.compare(it, Qt::CaseInsensitive) == 0; };
+    if (std::any_of(m_ForbiddenNames.cbegin(), m_ForbiddenNames.cend(), isForbidden)) {
+        invalidateInput(tr("'%1' is already used").arg(name));
+        return;
+    }
+
+    // Valid name
+    QDialog::accept();
+}
diff --git a/gui/ui/Variable/RenameVariableDialog.ui b/gui/ui/Variable/RenameVariableDialog.ui
new file mode 100644
index 0000000..987f5ba
--- /dev/null
+++ b/gui/ui/Variable/RenameVariableDialog.ui
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>RenameVariableDialog</class>
+ <widget class="QDialog" name="RenameVariableDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>379</width>
+    <height>109</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Rename variable</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="2" column="0">
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+   <item row="3" column="0">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="0">
+    <widget class="QLineEdit" name="nameLineEdit"/>
+   </item>
+   <item row="1" column="0">
+    <widget class="QLabel" name="errorLabel">
+     <property name="styleSheet">
+      <string notr="true">color: rgb(255, 0, 0);</string>
+     </property>
+     <property name="text">
+      <string>Error label</string>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>RenameVariableDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>RenameVariableDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>