diff --git a/src/Api/Data/Api/Response/Catalog/LanguageResponseInterface.php b/src/Api/Data/Api/Response/Catalog/LanguageResponseInterface.php
new file mode 100644
index 0000000..0109217
--- /dev/null
+++ b/src/Api/Data/Api/Response/Catalog/LanguageResponseInterface.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Api\Data\Api\Response\Catalog;
+
+interface LanguageResponseInterface
+{
+    public const LANGUAGES = 'languages';
+    public const LANGUAGE = 'language';
+
+    /**
+     * @return array
+     */
+    public function getLanguages(): array;
+
+    /**
+     * @param array $languages
+     * @return self
+     */
+    public function setLanguages(array $languages): self;
+}
diff --git a/src/Api/Data/Api/Type/LanguageTypeInterface.php b/src/Api/Data/Api/Type/LanguageTypeInterface.php
new file mode 100644
index 0000000..779e21c
--- /dev/null
+++ b/src/Api/Data/Api/Type/LanguageTypeInterface.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Api\Data\Api\Type;
+
+interface LanguageTypeInterface
+{
+    public const NAME = 'name';
+
+    public const KEY = 'key';
+
+    /**
+     * @return string
+     */
+    public function getName(): string;
+
+    /**
+     * @param string $name
+     * @return self
+     */
+    public function setName(string $name): self;
+
+    /**
+     * @return string
+     */
+    public function getLanguageId(): string;
+
+    /**
+     * @param string $languageId
+     * @return self
+     */
+    public function setLanguageId(string $languageId): self;
+}
diff --git a/src/Model/Api/Request/Catalog/LanguageRequest.php b/src/Model/Api/Request/Catalog/LanguageRequest.php
new file mode 100644
index 0000000..454d997
--- /dev/null
+++ b/src/Model/Api/Request/Catalog/LanguageRequest.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Model\Api\Request\Catalog;
+
+use Tweakwise\TweakwiseJs\Model\Api\Request;
+use Tweakwise\TweakwiseJs\Model\Api\Response\Catalog\LanguageResponse;
+
+class LanguageRequest extends Request
+{
+    /**
+     * @var string
+     */
+    protected string $path = 'catalog/languages';
+
+    /**
+     * @return string
+     */
+    public function getResponseType(): string
+    {
+        return LanguageResponse::class;
+    }
+}
diff --git a/src/Model/Api/Response/Catalog/LanguageResponse.php b/src/Model/Api/Response/Catalog/LanguageResponse.php
new file mode 100644
index 0000000..e3ca224
--- /dev/null
+++ b/src/Model/Api/Response/Catalog/LanguageResponse.php
@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Model\Api\Response\Catalog;
+
+use Magento\Framework\Data\Collection\AbstractDb;
+use Magento\Framework\Model\Context;
+use Magento\Framework\Model\ResourceModel\AbstractResource;
+use Magento\Framework\Registry;
+use Tweakwise\TweakwiseJs\Api\Data\Api\Response\Catalog\LanguageResponseInterface;
+use Tweakwise\TweakwiseJs\Model\Api\Response;
+use Tweakwise\TweakwiseJs\Model\Api\Type\LanguageType;
+use Tweakwise\TweakwiseJs\Model\Api\Type\LanguageTypeFactory;
+
+class LanguageResponse extends Response implements LanguageResponseInterface
+{
+    /**
+     * @param Context $context
+     * @param Registry $registry
+     * @param LanguageTypeFactory $languageTypeFactory
+     * @param AbstractResource|null $resource
+     * @param AbstractDb|null $resourceCollection
+     * @param array $data
+     */
+    public function __construct(
+        Context $context,
+        Registry $registry,
+        protected readonly LanguageTypeFactory $languageTypeFactory,
+        ?AbstractResource $resource = null,
+        ?AbstractDb $resourceCollection = null,
+        array $data = []
+    ) {
+        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
+    }
+
+    /**
+     * @return array
+     */
+    public function getLanguages(): array
+    {
+        $languages = $this->getData(self::LANGUAGES);
+        if ($languages) {
+            return $languages;
+        }
+
+        $language = $this->getData(self::LANGUAGE);
+        if ($language) {
+            if (isset($language['languageid']) && !isset($language[0])) {
+                $language = [$language];
+            }
+
+            $values = [];
+            foreach ($language as $value) {
+                if (!$value instanceof LanguageType) {
+                    $value = $this->languageTypeFactory->create(['data' => $value]);
+                }
+
+                $values[] = $value;
+            }
+
+            $this->setLanguages($values);
+        }
+
+        return $this->getData(self::LANGUAGES);
+    }
+
+    /**
+     * @param array $languages
+     * @return LanguageResponse
+     */
+    public function setLanguages(array $languages): LanguageResponseInterface
+    {
+        return $this->setData(self::LANGUAGES, $languages);
+    }
+}
diff --git a/src/Model/Api/Type/LanguageType.php b/src/Model/Api/Type/LanguageType.php
new file mode 100644
index 0000000..3cca9ae
--- /dev/null
+++ b/src/Model/Api/Type/LanguageType.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Model\Api\Type;
+
+use Magento\Framework\Model\AbstractModel;
+use Tweakwise\TweakwiseJs\Api\Data\Api\Type\LanguageTypeInterface;
+
+class LanguageType extends AbstractModel implements LanguageTypeInterface
+{
+    /**
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->getData(self::NAME);
+    }
+
+    /**
+     * @param string $name
+     * @return LanguageTypeInterface
+     */
+    public function setName(string $name): LanguageTypeInterface
+    {
+        return $this->setData(self::NAME, $name);
+    }
+
+    /**
+     * @return string
+     */
+    public function getLanguageId(): string
+    {
+        return $this->getData(self::KEY);
+    }
+
+    /**
+     * @param string $languageId
+     * @return LanguageTypeInterface
+     */
+    public function setLanguageId(string $languageId): LanguageTypeInterface
+    {
+        return $this->setData(self::KEY, $languageId);
+    }
+}
diff --git a/src/Model/Config.php b/src/Model/Config.php
index fae3299..527975f 100644
--- a/src/Model/Config.php
+++ b/src/Model/Config.php
@@ -15,6 +15,9 @@ class Config
 
     private const XML_PATH_MERCHANDISING_ENABLED = 'tweakwise/tweakwisejs/merchandising/enabled';
 
+    private const XML_PATH_UI_LANGUAGE = 'tweakwise/tweakwisejs/general/uilanguage';
+    private const XML_PATH_LANGUAGE = 'tweakwise/tweakwisejs/general/language';
+
     private const XML_PATH_SEARCH_TYPE = 'tweakwise/tweakwisejs/search/type';
     private const XML_PATH_EVENTS_ENABLED = 'tweakwise/tweakwisejs/events/enabled';
     private const XML_PATH_EVENTS_COOKIE_NAME = 'tweakwise/tweakwisejs/events/cookie_name';
@@ -76,4 +79,20 @@ public function getEventsCookieName(): string
     {
         return $this->scopeConfig->getValue(self::XML_PATH_EVENTS_COOKIE_NAME, ScopeInterface::SCOPE_STORE);
     }
+
+    /**
+     * @return string|null
+     */
+    public function getUiLanguage(): ?string
+    {
+        return $this->scopeConfig->getValue(self::XML_PATH_UI_LANGUAGE, ScopeInterface::SCOPE_STORE);
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getLanguage(): ?string
+    {
+        return $this->scopeConfig->getValue(self::XML_PATH_LANGUAGE, ScopeInterface::SCOPE_STORE);
+    }
 }
diff --git a/src/Model/Config/Source/Language.php b/src/Model/Config/Source/Language.php
new file mode 100644
index 0000000..6773413
--- /dev/null
+++ b/src/Model/Config/Source/Language.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Model\Config\Source;
+
+use Tweakwise\TweakwiseJs\Exception\ApiException;
+use Tweakwise\TweakwiseJs\Model\Api\Client;
+use Tweakwise\TweakwiseJs\Model\Api\RequestFactory;
+use Tweakwise\TweakwiseJs\Model\Api\Response\Catalog\LanguageResponse;
+use Magento\Framework\Data\OptionSourceInterface;
+
+class Language implements OptionSourceInterface
+{
+    /**
+     * @param RequestFactory $requestFactory
+     * @param Client $apiClient
+     */
+    public function __construct(
+        private readonly Client $apiClient,
+        private readonly RequestFactory $requestFactory,
+    ) {
+    }
+
+    /**
+     * @return array
+     */
+    public function toOptionArray()
+    {
+        $options = [
+            [
+                'label' => __('Default language'),
+                'value' => ''
+            ]
+        ];
+
+        try {
+            $request = $this->requestFactory->create();
+            /** @var LanguageResponse $response */
+            $response = $this->apiClient->request($request);
+
+            $languages = $response->getLanguages();
+
+            foreach ($languages as $language) {
+                $options[] = [
+                    'label' => $language->getName(),
+                    'value' => $language->getLanguageId()
+                ];
+            }
+        } catch (ApiException $e) {
+            //do nothing
+        }
+
+        return $options;
+    }
+}
diff --git a/src/Model/Config/Source/UiLanguage.php b/src/Model/Config/Source/UiLanguage.php
new file mode 100644
index 0000000..2ed7056
--- /dev/null
+++ b/src/Model/Config/Source/UiLanguage.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tweakwise\TweakwiseJs\Model\Config\Source;
+
+use Magento\Framework\Data\OptionSourceInterface;
+
+class UiLanguage implements OptionSourceInterface
+{
+    /**
+     * @return array
+     */
+    public function toOptionArray()
+    {
+        return [
+            [
+                'label' => __('Default language'),
+                'value' => ''
+            ],
+            ['value' => 'en', 'label' => __('English')],
+            ['value' => 'nl', 'label' => __('Dutch')],
+            ['value' => 'de', 'label' => __('German')],
+            ['value' => 'fr', 'label' => __('French')],
+            ['value' => 'es', 'label' => __('Spanish')],
+            ['value' => 'it', 'label' => __('Italian')],
+        ];
+    }
+}
diff --git a/src/ViewModel/Base.php b/src/ViewModel/Base.php
index 8f7e354..e1d2810 100644
--- a/src/ViewModel/Base.php
+++ b/src/ViewModel/Base.php
@@ -49,4 +49,20 @@ public function isEventsEnabled(): bool
     {
         return $this->config->isEventsEnabled();
     }
+
+    /**
+     * @return string|null
+     */
+    public function getUiLanguage(): ?string
+    {
+        return $this->config->getUiLanguage();
+    }
+
+    /**
+     * @return string|null
+     */
+    public function getLanguage(): ?string
+    {
+        return $this->config->getLanguage();
+    }
 }
diff --git a/src/etc/adminhtml/di.xml b/src/etc/adminhtml/di.xml
index 0c7e72e..b07d60a 100644
--- a/src/etc/adminhtml/di.xml
+++ b/src/etc/adminhtml/di.xml
@@ -15,6 +15,13 @@
             </argument>
         </arguments>
     </virtualType>
+    <virtualType name="Tweakwise\TweakwiseJs\Model\Api\RequestFactory\Catalog\LanguageRequest"
+                 type="Tweakwise\TweakwiseJs\Model\Api\RequestFactory">
+        <arguments>
+            <argument name="type" xsi:type="string">Tweakwise\TweakwiseJs\Model\Api\Request\Catalog\LanguageRequest
+            </argument>
+        </arguments>
+    </virtualType>
     <virtualType name="Tweakwise\TweakwiseJs\Model\Api\RequestFactory\Catalog\SortTemplateRequest"
                  type="Tweakwise\TweakwiseJs\Model\Api\RequestFactory">
         <arguments>
@@ -57,6 +64,13 @@
             </argument>
         </arguments>
     </virtualType>
+    <type name="Tweakwise\TweakwiseJs\Model\Config\Source\Language">
+        <arguments>
+            <argument name="requestFactory" xsi:type="object">
+                Tweakwise\TweakwiseJs\Model\Api\RequestFactory\Catalog\LanguageRequest
+            </argument>
+        </arguments>
+    </type>
     <virtualType name="Tweakwise\TweakwiseJs\Model\Config\Source\SortTemplate"
                  type="Tweakwise\TweakwiseJs\Model\Config\Source\Template">
         <arguments>
diff --git a/src/etc/adminhtml/system.xml b/src/etc/adminhtml/system.xml
index e6886d2..8a942d6 100644
--- a/src/etc/adminhtml/system.xml
+++ b/src/etc/adminhtml/system.xml
@@ -25,6 +25,16 @@
                             <field id="enabled">1</field>
                         </depends>
                     </field>
+                    <field id="uilanguage" translate="label" type="select" sortOrder="40" showInDefault="1" showInWebsite="1" showInStore="1">
+                        <label>UI Language</label>
+                        <source_model>Tweakwise\TweakwiseJs\Model\Config\Source\UiLanguage</source_model>
+                        <comment><![CDATA[Choose which language to use for the User interface<br /><strong style="color:red">Important:</strong> Save your instance key so that all options are loaded.]]></comment>
+                    </field>
+                    <field id="language" translate="label" type="select" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="1">
+                        <label>Language</label>
+                        <source_model>Tweakwise\TweakwiseJs\Model\Config\Source\Language</source_model>
+                        <comment><![CDATA[Choose which language to use<br /><strong style="color:red">Important:</strong> Save your instance key so that all options are loaded.]]></comment>
+                    </field>
                 </group>
                 <group id="merchandising" translate="label" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Merchandising</label>
diff --git a/src/view/frontend/layout/default.xml b/src/view/frontend/layout/default.xml
index fb70c4b..94ec3fd 100644
--- a/src/view/frontend/layout/default.xml
+++ b/src/view/frontend/layout/default.xml
@@ -7,7 +7,11 @@
             <block class="Magento\Framework\View\Element\Template"
                    name="tweakwise-js-default"
                    template="Tweakwise_TweakwiseJs::js/default.phtml"
-                   ifconfig="tweakwise/tweakwisejs/general/enabled"/>
+                   ifconfig="tweakwise/tweakwisejs/general/enabled">
+                <arguments>
+                    <argument name="view_model" xsi:type="object">Tweakwise\TweakwiseJs\ViewModel\Base</argument>
+                </arguments>
+            </block>
 
             <!-- Default events JavaScript block -->
             <block class="Magento\Framework\View\Element\Template"
diff --git a/src/view/frontend/templates/js/default.phtml b/src/view/frontend/templates/js/default.phtml
index 36bcaa1..8f3ddf8 100644
--- a/src/view/frontend/templates/js/default.phtml
+++ b/src/view/frontend/templates/js/default.phtml
@@ -2,8 +2,13 @@
 declare(strict_types = 1);
 
 use Magento\Framework\View\Element\Template;
+use Tweakwise\TweakwiseJs\ViewModel\Base;
 
 /** @var Template $block */
+/** @var Base $viewModel */
+$viewModel = $block->getData('view_model');
+$language = (string) $viewModel->getLanguage();
+$uiLanguage = (string) $viewModel->getUiLanguage();
 ?>
 
 <script>
@@ -15,5 +20,12 @@ use Magento\Framework\View\Element\Template;
     };
     window['twn-starter-config'] = window['twn-starter-config'] || {};
     window['twn-starter-config'].on = window['twn-starter-config'].on || {};
+    <?php if ($language !== ''): ?>
+        window['twn-starter-config'].lang = '<?= $block->escapeJs($language) ?>';
+    <?php endif; ?>
+    <?php if ($uiLanguage !== ''): ?>
+        window['twn-starter-config'].ui = window['twn-starter-config'].ui || {};
+        window['twn-starter-config'].ui.lang = '<?= $block->escapeJs($uiLanguage) ?>';
+    <?php endif; ?>
 </script>