diff --git a/src/Common/FormData.php b/src/Common/FormData.php
index 2756aba..fde1281 100644
--- a/src/Common/FormData.php
+++ b/src/Common/FormData.php
@@ -9,7 +9,7 @@ abstract class FormData
 {
     // Abstract methods
 
-    abstract public static function createFromArray($raw): self;
+    abstract public static function createFromArray(array $raw): self;
 
 
     // Input validation - Base types
@@ -26,6 +26,16 @@ abstract class FormData
         return $raw;
     }
 
+    protected static function validateInteger(string $raw, bool $required = true, string $fieldName = 'Field'): int
+    {
+        if ($raw === '' && $required) {
+            throw new InputValidationError("$fieldName is required.");
+        } elseif (!is_numeric($raw)) {
+            throw new InputValidationError("$fieldName is not a number.");
+        }
+        return (int)$raw;
+    }
+
     protected static function validateBoolOption(string $raw): bool
     {
         return $raw !== '';
diff --git a/src/Frontend/Accounts/AccountAddAliasData.php b/src/Frontend/Accounts/AccountAddAliasData.php
index 306ca90..6e5a3c6 100644
--- a/src/Frontend/Accounts/AccountAddAliasData.php
+++ b/src/Frontend/Accounts/AccountAddAliasData.php
@@ -14,7 +14,7 @@ class AccountAddAliasData extends FormData
         $this->aliasAddress = $aliasAddress;
     }
 
-    public static function createFromArray($raw): self
+    public static function createFromArray(array $raw): self
     {
         return new self(
             self::validateAliasAddress(trim($raw['alias_address'] ?? '')),
diff --git a/src/Frontend/Accounts/AccountController.php b/src/Frontend/Accounts/AccountController.php
index 1f9d6ac..42ee4bb 100644
--- a/src/Frontend/Accounts/AccountController.php
+++ b/src/Frontend/Accounts/AccountController.php
@@ -236,7 +236,33 @@ class AccountController extends BaseController
             $this->sessionHelper->setLastActionResult(ActionResult::createErrorResult($e->getMessage(), $addAliasData));
         }
 
-        // Redirect to edit form page via GET (PRG)
-        return $response->withHeader('Location', '/accounts/' . $accountId)->withStatus(303);
+        // Redirect to account details page via GET (PRG)
+        return $response->withHeader('Location', '/accounts/' . $accountId . '#aliases')->withStatus(303);
+    }
+
+
+    // -- /accounts/{id}/deletealiases - Deletes a list of aliases
+
+    public function deleteAliasesFromAccount(Request $request, Response $response, array $args): Response
+    {
+        // Parse URL arguments and form data
+        $accountId = (int)$args['id'];
+        $deleteAliasesData = $request->getParsedBody();
+
+        try {
+            // Validate input
+            $validatedDeleteAliasesData = AccountDeleteAliasesData::createFromArray($deleteAliasesData);
+            $deletedCount = $this->accountHandler->deleteAliasesFromAccount($accountId, $validatedDeleteAliasesData);
+
+            // Save success result
+            $successMessage = $deletedCount === 1 ? "1 alias was deleted." : "{$deletedCount} aliases were deleted.";
+            $this->sessionHelper->setLastActionResult(ActionResult::createSuccessResult($successMessage));
+        } catch (AppException $e) {
+            // Save error result
+            $this->sessionHelper->setLastActionResult(ActionResult::createErrorResult($e->getMessage()));
+        }
+
+        // Redirect to account details page via GET (PRG)
+        return $response->withHeader('Location', '/accounts/' . $accountId . '#aliases')->withStatus(303);
     }
 }
diff --git a/src/Frontend/Accounts/AccountCreateData.php b/src/Frontend/Accounts/AccountCreateData.php
index 265e5ed..166fa6e 100644
--- a/src/Frontend/Accounts/AccountCreateData.php
+++ b/src/Frontend/Accounts/AccountCreateData.php
@@ -22,7 +22,7 @@ class AccountCreateData extends FormData
         $this->memo = $memo;
     }
 
-    public static function createFromArray($raw): self
+    public static function createFromArray(array $raw): self
     {
         return new self(
             self::validateUsername(trim($raw['username'] ?? '')),
diff --git a/src/Frontend/Accounts/AccountDeleteAliasesData.php b/src/Frontend/Accounts/AccountDeleteAliasesData.php
new file mode 100644
index 0000000..2f828f3
--- /dev/null
+++ b/src/Frontend/Accounts/AccountDeleteAliasesData.php
@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Frontend\Accounts;
+
+use MailAccountAdmin\Common\FormData;
+use MailAccountAdmin\Exceptions\InputValidationError;
+
+class AccountDeleteAliasesData extends FormData
+{
+    /** @var array[int] */
+    private array $selectedAliasIds;
+
+    private function __construct(array $selectedAliasIds)
+    {
+        $this->selectedAliasIds = $selectedAliasIds;
+    }
+
+    public static function createFromArray(array $raw): self
+    {
+        $rawAliasIds = $raw['selected_aliases'] ?? [];
+
+        if (!is_array($rawAliasIds)) {
+            throw new InputValidationError('selected_aliases is not an array.');
+        }
+        if (empty($rawAliasIds)) {
+            throw new InputValidationError('No aliases were selected.');
+        }
+
+        $selectedAliasIds = [];
+        foreach ($rawAliasIds as $i => $id) {
+            $selectedAliasIds[] = self::validateInteger($id, true, "selected_aliases[$i]");
+        }
+
+        return new self($selectedAliasIds);
+    }
+
+    public function getSelectedAliasIds(): array
+    {
+        return $this->selectedAliasIds;
+    }
+}
diff --git a/src/Frontend/Accounts/AccountEditData.php b/src/Frontend/Accounts/AccountEditData.php
index a48a88e..499b6f8 100644
--- a/src/Frontend/Accounts/AccountEditData.php
+++ b/src/Frontend/Accounts/AccountEditData.php
@@ -29,7 +29,7 @@ class AccountEditData extends FormData
         $this->memo = $memo;
     }
 
-    public static function createFromArray($raw): self
+    public static function createFromArray(array $raw): self
     {
         return new self(
             self::validateUsername(trim($raw['username'] ?? ''), false),
diff --git a/src/Frontend/Accounts/AccountHandler.php b/src/Frontend/Accounts/AccountHandler.php
index 32dce32..4a71fc0 100644
--- a/src/Frontend/Accounts/AccountHandler.php
+++ b/src/Frontend/Accounts/AccountHandler.php
@@ -6,6 +6,7 @@ namespace MailAccountAdmin\Frontend\Accounts;
 use MailAccountAdmin\Common\PasswordHelper;
 use MailAccountAdmin\Exceptions\AccountNotFoundException;
 use MailAccountAdmin\Exceptions\InputValidationError;
+use MailAccountAdmin\Models\Account;
 use MailAccountAdmin\Repositories\AccountRepository;
 use MailAccountAdmin\Repositories\AliasRepository;
 use MailAccountAdmin\Repositories\DomainRepository;
@@ -27,6 +28,17 @@ class AccountHandler
     }
 
 
+    // -- Helper methods
+
+    private function ensureAccountExists(int $accountId): Account
+    {
+        try {
+            return $this->accountRepository->fetchAccountById($accountId);
+        } catch (AccountNotFoundException $e) {
+            throw new InputValidationError('Account with ID ' . $accountId . ' does not exist!');
+        }
+    }
+
     // -- /accounts - List all accounts
 
     public function listAccounts(string $filterByDomain): array
@@ -134,11 +146,7 @@ class AccountHandler
         $returnData = [];
 
         // Check if account exists
-        try {
-            $account = $this->accountRepository->fetchAccountById($accountId);
-        } catch (AccountNotFoundException $e) {
-            throw new InputValidationError('Account with ID ' . $accountId . ' does not exist!');
-        }
+        $account = $this->ensureAccountExists($accountId);
 
         $newUsername = $editData->getUsername();
         if ($newUsername === $account->getUsername()) {
@@ -146,9 +154,9 @@ class AccountHandler
             $newUsername = null;
         }
 
-        // This variable will be set to true if the user wants to change their username, has an existing alias with this username,
-        // and checked the "replace existing alias" option.
-        $aliasNeedsToBeReplaced = false;
+        // If the user wants to change their username, has an existing alias with this username and checked the "replace existing alias"
+        // option, this variable will be set to the ID of the alias that needs to be deleted.
+        $aliasNeedsToBeReplaced = null;
 
         // Check if new username is still available
         if ($newUsername !== null) {
@@ -167,7 +175,7 @@ class AccountHandler
                 if ($editData->getUsernameReplaceAlias()) {
                     $existingAlias = $this->aliasRepository->fetchAliasByAddress($newUsername);
                     if ($existingAlias->getUserId() === $accountId) {
-                        $aliasNeedsToBeReplaced = true;
+                        $aliasNeedsToBeReplaced = $existingAlias->getId();
                         $newUsernameAvailable = true;
                     }
                 }
@@ -211,8 +219,8 @@ class AccountHandler
         );
 
         // Remove existing alias for new username (if wanted)
-        if ($editData->getUsernameReplaceAlias() && $aliasNeedsToBeReplaced) {
-            $this->aliasRepository->deleteAlias($accountId, $newUsername);
+        if ($editData->getUsernameReplaceAlias() && $aliasNeedsToBeReplaced !== null) {
+            $this->aliasRepository->deleteAliasById($accountId, $aliasNeedsToBeReplaced);
         }
 
         // Commit database transaction
@@ -242,11 +250,7 @@ class AccountHandler
     public function deleteAccount(int $accountId): array
     {
         // Check if account exists
-        try {
-            $account = $this->accountRepository->fetchAccountById($accountId);
-        } catch (AccountNotFoundException $e) {
-            throw new InputValidationError('Account with ID ' . $accountId . ' does not exist!');
-        }
+        $account = $this->ensureAccountExists($accountId);
 
         // Start database transaction
         $this->accountRepository->beginTransaction();
@@ -272,11 +276,7 @@ class AccountHandler
     public function addAliasToAccount(int $accountId, AccountAddAliasData $aliasAddData): void
     {
         // Check if account exists
-        try {
-            $this->accountRepository->fetchAccountById($accountId);
-        } catch (AccountNotFoundException $e) {
-            throw new InputValidationError('Account with ID ' . $accountId . ' does not exist!');
-        }
+        $this->ensureAccountExists($accountId);
 
         // Check if alias address is still available
         $address = $aliasAddData->getAliasAddress();
@@ -287,4 +287,29 @@ class AccountHandler
         // Create alias in database
         $this->aliasRepository->createNewAlias($accountId, $address);
     }
+
+
+    // -- /accounts/{id}/deletealiases - Deletes a list of aliases from the account
+
+    public function deleteAliasesFromAccount(int $accountId, AccountDeleteAliasesData $aliasesDeleteData): int
+    {
+        // Check if account exists
+        $this->ensureAccountExists($accountId);
+
+        // Start database transaction
+        $this->aliasRepository->beginTransaction();
+
+        // Delete aliases
+        $deletedCount = 0;
+        foreach ($aliasesDeleteData->getSelectedAliasIds() as $aliasId) {
+            if ($this->aliasRepository->deleteAliasById($accountId, $aliasId)) {
+                $deletedCount++;
+            }
+        }
+
+        // Commit database transaction
+        $this->aliasRepository->commitTransaction();
+
+        return $deletedCount;
+    }
 }
diff --git a/src/Repositories/AliasRepository.php b/src/Repositories/AliasRepository.php
index 86b9caf..45ed640 100644
--- a/src/Repositories/AliasRepository.php
+++ b/src/Repositories/AliasRepository.php
@@ -52,14 +52,15 @@ class AliasRepository extends BaseRepository
         ]);
     }
 
-    public function deleteAlias(int $userId, string $mailAddress): void
+    public function deleteAliasById(int $userId, int $aliasId): bool
     {
         // Check user ID in WHERE clause to make sure we don't accidentally delete someone else's alias
-        $statement = $this->pdo->prepare('DELETE FROM mail_aliases WHERE user_id = :user_id AND mail_address = :mail_address LIMIT 1');
+        $statement = $this->pdo->prepare('DELETE FROM mail_aliases WHERE user_id = :user_id AND alias_id = :alias_id LIMIT 1');
         $statement->execute([
             'user_id' => $userId,
-            'mail_address' => $mailAddress,
+            'alias_id' => $aliasId,
         ]);
+        return $statement->rowCount() > 0;
     }
 
     public function deleteAllAliasesForUserId(int $userId): int
diff --git a/src/Routes.php b/src/Routes.php
index 00611ab..c8b7a92 100644
--- a/src/Routes.php
+++ b/src/Routes.php
@@ -34,5 +34,6 @@ class Routes
         $app->get('/accounts/{id:[1-9][0-9]*}/delete', AccountController::class . ':showAccountDelete');
         $app->post('/accounts/{id:[1-9][0-9]*}/delete', AccountController::class . ':deleteAccount');
         $app->post('/accounts/{id:[1-9][0-9]*}/addalias', AccountController::class . ':addAliasToAccount');
+        $app->post('/accounts/{id:[1-9][0-9]*}/deletealiases', AccountController::class . ':deleteAliasesFromAccount');
     }
 }
diff --git a/templates/account_details.html.twig b/templates/account_details.html.twig
index 4e00c14..0c092cc 100644
--- a/templates/account_details.html.twig
+++ b/templates/account_details.html.twig
@@ -62,34 +62,41 @@
         </tr>
     </table>
 
-    <h3>Aliases</h3>
+    <h3 id="aliases">Aliases</h3>
+
+    {{ include('includes/form_result_box.html.twig') }}
 
     {% if aliases %}
-        <table class="bordered_table">
-            <tr>
-                <th>Address</th>
-                <th>Created at</th>
-                <th>Actions</th>
-            </tr>
-            {% for alias in aliases %}
+        <form action="/accounts/{{ id }}/deletealiases" method="POST">
+            <table class="bordered_table">
                 <tr>
-                    <td>{{ alias.getMailAddress() }}</td>
-                    <td>{{ alias.getCreatedAt() | date }}</td>
-                    <td><a href="#">Delete</a></td> {# TODO #}
+                    <th></th>
+                    <th>Address</th>
+                    <th>Created at</th>
                 </tr>
-            {% endfor %}
-        </table>
+                {% for alias in aliases %}
+                    <tr>
+                        <td><input type="checkbox" id="delete_selected_{{ alias.getId() }}" name="selected_aliases[]" value="{{ alias.getId() }}"/></td>
+                        <td><label for="delete_selected_{{ alias.getId() }}">{{ alias.getMailAddress() }}</label></td>
+                        <td>{{ alias.getCreatedAt() | date }}</td>
+                    </tr>
+                {% endfor %}
+            </table>
+            <p>
+                <button type="submit">Delete selected aliases</button>
+            </p>
+        </form>
     {% else %}
         <p>No aliases.</p>
     {% endif %}
 
     <form action="/accounts/{{ id }}/addalias" method="POST">
-        {{ include('includes/form_result_box.html.twig') }}
-
         <table class="margin_vertical_1rem">
             <tr>
                 <td><label for="add_alias_address">New alias:</label></td>
-                <td><input id="add_alias_address" name="alias_address" value="{{ formData['new_alias'] | default('') }}"/></td>
+                <td>
+                    <input id="add_alias_address" name="alias_address" value="{{ formData['new_alias'] | default('') }}" {{ success is defined or error is defined ? 'autofocus': '' }}/>
+                </td>
             </tr>
             <tr>
                 <td colspan="2">