diff --git a/assets/less/classes/forum/forum.less b/assets/less/classes/forum/forum.less
new file mode 100644
index 00000000..7ee20beb
--- /dev/null
+++ b/assets/less/classes/forum/forum.less
@@ -0,0 +1,10 @@
+@import "actions";
+@import "categories";
+@import "category";
+@import "confirm";
+@import "header";
+@import "post";
+@import "status";
+@import "topic";
+@import "topics";
+@import "leaderboard/leaderboard";
diff --git a/assets/less/classes/forum/leaderboard/categories.less b/assets/less/classes/forum/leaderboard/categories.less
new file mode 100644
index 00000000..2de19ac2
--- /dev/null
+++ b/assets/less/classes/forum/leaderboard/categories.less
@@ -0,0 +1,8 @@
+.forum__leaderboard__categories {
+    display: block;
+    overflow-x: auto;
+    overflow-y: hidden;
+    white-space: nowrap;
+    margin: 2px 0;
+    scrollbar-width: thin;
+}
diff --git a/assets/less/classes/forum/leaderboard/category.less b/assets/less/classes/forum/leaderboard/category.less
new file mode 100644
index 00000000..55a5c7c7
--- /dev/null
+++ b/assets/less/classes/forum/leaderboard/category.less
@@ -0,0 +1,19 @@
+.forum__leaderboard__category {
+    display: inline-block;
+    color: inherit;
+    text-decoration: none;
+    margin: 2px;
+    padding: 2px 5px;
+    border-radius: 4px;
+    transition: background-color .2s;
+
+    &:hover,
+    &:focus {
+        background-color: fade(#fff, 20%);
+    }
+
+    &--active,
+    &:active {
+        background-color: fade(#fff, 10%);
+    }
+}
diff --git a/assets/less/classes/forum/leaderboard/leaderboard.less b/assets/less/classes/forum/leaderboard/leaderboard.less
new file mode 100644
index 00000000..8072ccd4
--- /dev/null
+++ b/assets/less/classes/forum/leaderboard/leaderboard.less
@@ -0,0 +1,4 @@
+@import "categories";
+@import "category";
+@import "markdown";
+@import "user";
diff --git a/assets/less/classes/forum/leaderboard/markdown.less b/assets/less/classes/forum/leaderboard/markdown.less
new file mode 100644
index 00000000..518abbaf
--- /dev/null
+++ b/assets/less/classes/forum/leaderboard/markdown.less
@@ -0,0 +1,8 @@
+.forum__leaderboard__markdown {
+    display: block;
+    width: 100%;
+    min-width: 100%;
+    max-width: 100%;
+    min-height: 500px;
+    margin: 2px auto;
+}
diff --git a/assets/less/classes/forum/leaderboard/user.less b/assets/less/classes/forum/leaderboard/user.less
new file mode 100644
index 00000000..bd3efb0a
--- /dev/null
+++ b/assets/less/classes/forum/leaderboard/user.less
@@ -0,0 +1,83 @@
+.forum__leaderboard__user {
+    margin: 2px 0;
+    font-size: 1.2em;
+
+    &--rank-1 {
+        font-size: 1.6em;
+    }
+
+    &--rank-2,
+    &--rank-3 {
+        font-size: 1.4em;
+    }
+
+    &__background {
+        position: absolute;
+        top: 0;
+        left: 0;
+        width: 100%;
+        height: 100%;
+        text-decoration: none;
+        color: inherit;
+    }
+
+    &__content {
+        display: flex;
+        pointer-events: none;
+    }
+
+    &__rank {
+        height: 40px;
+        min-width: 50px;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-weight: 700;
+        flex: 0 0 auto;
+
+        &:before {
+            content: "#";
+        }
+    }
+
+    &--rank-1 &__rank {
+        height: 50px;
+    }
+
+    &__avatar {
+        width: 40px;
+        height: 40px;
+        margin: 2px 7px;
+        flex: 0 0 auto;
+    }
+
+    &--rank-1 &__avatar {
+        width: 50px;
+        height: 50px;
+        margin: 2px;
+    }
+
+    &__username {
+        flex: 1 1 auto;
+        line-height: 30px;
+        padding: 5px;
+        margin: 2px;
+    }
+
+    &--rank-1 &__username {
+        line-height: 40px;
+    }
+
+    &__posts {
+        flex: 0 0 auto;
+        min-width: 150px;
+        border-left: 1px solid fade(#fff, 20%);
+        line-height: 30px;
+        padding: 5px;
+        margin: 2px;
+    }
+
+    &--rank-1 &__posts {
+        line-height: 40px;
+    }
+}
diff --git a/assets/less/main.less b/assets/less/main.less
index 140b5ea8..f911d55e 100644
--- a/assets/less/main.less
+++ b/assets/less/main.less
@@ -194,15 +194,7 @@ html {
 @import "classes/news/post"; // post needs to be able to override sidebar
 
 // Forums
-@import "classes/forum/actions";
-@import "classes/forum/categories";
-@import "classes/forum/category";
-@import "classes/forum/confirm";
-@import "classes/forum/post";
-@import "classes/forum/topic";
-@import "classes/forum/topics";
-@import "classes/forum/status";
-@import "classes/forum/header";
+@import "classes/forum/forum";
 
 // User stuff
 @import "classes/usercard";
diff --git a/misuzu.php b/misuzu.php
index 2a4846b0..cba24187 100644
--- a/misuzu.php
+++ b/misuzu.php
@@ -50,6 +50,7 @@ require_once 'src/twitter.php';
 require_once 'src/url.php';
 require_once 'src/zalgo.php';
 require_once 'src/Forum/forum.php';
+require_once 'src/Forum/leaderboard.php';
 require_once 'src/Forum/perms.php';
 require_once 'src/Forum/post.php';
 require_once 'src/Forum/topic.php';
diff --git a/public/forum/leaderboard.php b/public/forum/leaderboard.php
new file mode 100644
index 00000000..2de324fb
--- /dev/null
+++ b/public/forum/leaderboard.php
@@ -0,0 +1,54 @@
+<?php
+require_once '../../misuzu.php';
+
+if (!perms_check_user(MSZ_PERMS_FORUM, user_session_current('user_id'), MSZ_PERM_FORUM_VIEW_LEADERBOARD)) {
+    echo render_error(403);
+    return;
+}
+
+$leaderboardMode = !empty($_GET['mode']) && is_string($_GET['mode']) && ctype_lower($_GET['mode']) ? $_GET['mode'] : '';
+$leaderboardId = !empty($_GET['id']) && is_string($_GET['id'])
+    && ctype_digit($_GET['id'])
+    ? $_GET['id']
+    : MSZ_FORUM_LEADERBOARD_CATEGORY_ALL;
+$leaderboardIdLength = strlen($leaderboardId);
+
+$leaderboardYear = $leaderboardIdLength === 4 || $leaderboardIdLength === 6 ? substr($leaderboardId, 0, 4) : null;
+$leaderboardMonth = $leaderboardIdLength === 6 ? substr($leaderboardId, 4, 2) : null;
+
+$leaderboards = forum_leaderboard_categories();
+$leaderboard = forum_leaderboard_listing($leaderboardYear, $leaderboardMonth);
+
+$leaderboardName = 'All Time';
+
+if($leaderboardYear) {
+    $leaderboardName = "Leaderboard {$leaderboardYear}";
+
+    if($leaderboardMonth) {
+        $leaderboardName .= "-{$leaderboardMonth}";
+    }
+}
+
+if($leaderboardMode === 'markdown') {
+    $markdown = <<<MD
+# {$leaderboardName}
+
+| Rank | Usename | Post count |
+| ----:|:------- | ----------:|
+
+MD;
+
+    foreach($leaderboard as $user) {
+        $markdown .= sprintf("| %s | [%s](%s%s) | %s |\r\n", $user['rank'], $user['username'], url_prefix(false), url('user-profile', ['user' => $user['user_id']]), $user['posts']);
+    }
+
+    tpl_var('leaderboard_markdown', $markdown);
+}
+
+echo tpl_render('forum.leaderboard', [
+    'leaderboard_id' => $leaderboardId,
+    'leaderboard_name' => $leaderboardName,
+    'leaderboard_categories' => $leaderboards,
+    'leaderboard_data' => $leaderboard,
+    'leaderboard_mode' => $leaderboardMode,
+]);
diff --git a/src/Forum/forum.php b/src/Forum/forum.php
index 14a4c74c..8d8755af 100644
--- a/src/Forum/forum.php
+++ b/src/Forum/forum.php
@@ -3,6 +3,7 @@
  * GLOBAL PERMISSIONS *
  **********************/
 define('MSZ_PERM_FORUM_MANAGE_FORUMS', 1);
+define('MSZ_PERM_FORUM_VIEW_LEADERBOARD', 2);
 
 /*************************
  * PER-FORUM PERMISSIONS *
diff --git a/src/Forum/leaderboard.php b/src/Forum/leaderboard.php
new file mode 100644
index 00000000..f6a6d0f8
--- /dev/null
+++ b/src/Forum/leaderboard.php
@@ -0,0 +1,93 @@
+<?php
+define('MSZ_FORUM_LEADERBOARD_START_YEAR', 2018);
+define('MSZ_FORUM_LEADERBOARD_START_MONTH', 12);
+define('MSZ_FORUM_LEADERBOARD_CATEGORY_ALL', 0);
+
+function forum_leaderboard_year_valid(?int $year): bool
+{
+    return !is_null($year) && $year >= MSZ_FORUM_LEADERBOARD_START_YEAR && $year <= date('Y');
+}
+
+function forum_leaderboard_month_valid(?int $year, ?int $month): bool
+{
+    if (is_null($month) || !forum_leaderboard_year_valid($year) || $month < 1 || $month > 12) {
+        return false;
+    }
+
+    $combo = sprintf('%04d%02d', $year, $month);
+    $start = sprintf('%04d%02d', MSZ_FORUM_LEADERBOARD_START_YEAR, MSZ_FORUM_LEADERBOARD_START_MONTH);
+    $current = date('Ym');
+
+    return $combo >= $start && $combo <= $current;
+}
+
+function forum_leaderboard_categories(): array
+{
+    $categories = [
+        MSZ_FORUM_LEADERBOARD_CATEGORY_ALL => 'All Time',
+    ];
+
+    $currentYear = date('Y');
+    $currentMonth = date('m');
+
+    for ($i = MSZ_FORUM_LEADERBOARD_START_YEAR; $i <= $currentYear; $i++) {
+        $categories[$i] = sprintf('Leaderboard %d', $i);
+    }
+
+    for ($i = MSZ_FORUM_LEADERBOARD_START_YEAR, $j = MSZ_FORUM_LEADERBOARD_START_MONTH;;) {
+        $categories[sprintf('%d%02d', $i, $j)] = sprintf('Leaderboard %d-%02d', $i, $j);
+
+        if ($j >= 12) {
+            $i++; $j = 1;
+        } else $j++;
+
+        if ($i >= $currentYear && $j > $currentMonth)
+            break;
+    }
+
+    return $categories;
+}
+
+function forum_leaderboard_listing(?int $year = null, ?int $month = null): array
+{
+    $hasYear = forum_leaderboard_year_valid($year);
+    $hasMonth = $hasYear && forum_leaderboard_month_valid($year, $month);
+
+    $rawLeaderboard = db_fetch_all(db_query(sprintf(
+        '
+            SELECT
+                u.`user_id`, u.`username`,
+                COUNT(fp.`post_id`) as `posts`
+            FROM `msz_users` AS u
+            INNER JOIN `msz_forum_posts` AS fp
+            ON fp.`user_id` = u.`user_id`
+            WHERE fp.`post_deleted` IS NULL
+            %s
+            GROUP BY u.`user_id`
+            HAVING `posts` > 0
+            ORDER BY `posts` DESC
+        ',
+        !$hasYear ? '' : sprintf(
+            'AND DATE(fp.`post_created`) BETWEEN \'%1$04d-%2$02d-01\' AND \'%1$04d-%3$02d-31\'',
+            $year,
+            $hasMonth ? $month : 1,
+            $hasMonth ? $month : 12
+        )
+    )));
+
+    $leaderboard = [];
+    $ranking = 0;
+    $lastPosts = null;
+
+    foreach ($rawLeaderboard as $entry) {
+        if (is_null($lastPosts) || $lastPosts > $entry['posts']) {
+            $ranking++;
+            $lastPosts = $entry['posts'];
+        }
+
+        $entry['rank'] = $ranking;
+        $leaderboard[] = $entry;
+    }
+
+    return $leaderboard;
+}
diff --git a/src/manage.php b/src/manage.php
index 8a59c3f9..8521e659 100644
--- a/src/manage.php
+++ b/src/manage.php
@@ -282,6 +282,11 @@ function manage_perms_list(array $rawPerms): array
                     'title' => 'Can manage forum sections.',
                     'perm' => MSZ_PERM_FORUM_MANAGE_FORUMS,
                 ],
+                [
+                    'section' => 'view-leaderboard',
+                    'title' => 'Can view the forum leaderboard live.',
+                    'perm' => MSZ_PERM_FORUM_VIEW_LEADERBOARD,
+                ],
             ],
         ],
         [
diff --git a/src/perms.php b/src/perms.php
index e9209fac..4917600c 100644
--- a/src/perms.php
+++ b/src/perms.php
@@ -202,7 +202,7 @@ function perms_check(int $perms, int $perm): bool
     return ($perms & $perm) > 0;
 }
 
-function perms_check_user(string $prefix, int $userId, int $perm): bool
+function perms_check_user(string $prefix, ?int $userId, int $perm): bool
 {
-    return perms_check(perms_get_user($prefix, $userId), $perm);
+    return $userId > 0 && perms_check(perms_get_user($prefix, $userId), $perm);
 }
diff --git a/src/url.php b/src/url.php
index b3b994af..8b16c1bb 100644
--- a/src/url.php
+++ b/src/url.php
@@ -32,6 +32,7 @@ define('MSZ_URLS', [
     'news-category'                     => ['/news.php',                ['c' => '<category>', 'page' => '<page>']],
 
     'forum-index'                       => ['/forum'],
+    'forum-leaderboard'                 => ['/forum/leaderboard.php',   ['id' => '<id>', 'mode' => '<mode>']],
     'forum-mark-global'                 => ['/forum/index.php',         ['m' => 'mark', 'c' => '{forum_mark}']],
     'forum-mark-single'                 => ['/forum/index.php',         ['m' => 'mark', 'c' => '{forum_mark}', 'f' => '<forum>']],
     'forum-topic-new'                   => ['/forum/posting.php',       ['f' => '<forum>']],
@@ -224,3 +225,23 @@ function url_proxy_media(?string $url): ?string
 
     return url('media-proxy', compact('hash', 'url'));
 }
+
+function url_prefix(bool $trailingSlash = true): string
+{
+    return 'http' . (empty($_SERVER['HTTPS']) ? '' : 's') . '://' . $_SERVER['HTTP_HOST'] . ($trailingSlash ? '/' : '');
+}
+
+function is_local_url(string $url): bool
+{
+    $length = mb_strlen($url);
+
+    if ($length < 1) {
+        return false;
+    }
+
+    if ($url[0] === '/' && ($length > 1 ? $url[1] !== '/' : true)) {
+        return true;
+    }
+
+    return starts_with($url, url_prefix());
+}
diff --git a/templates/forum/leaderboard.twig b/templates/forum/leaderboard.twig
new file mode 100644
index 00000000..67932405
--- /dev/null
+++ b/templates/forum/leaderboard.twig
@@ -0,0 +1,45 @@
+{% extends 'forum/master.twig' %}
+{% from 'forum/macros.twig' import forum_header %}
+
+{% set title = 'Forum Leaderboard » ' ~ leaderboard_name %}
+{% set canonical_url = url('forum-leaderboard', {
+    'id': leaderboard_id,
+    'mode': '',
+}) %}
+
+{% block content %}
+    {{ forum_header(title, [], false, canonical_url, [
+        {
+            'html': '<i class="fab fa-markdown fa-fw"></i> Markdown',
+            'url': url('forum-leaderboard', {'id': leaderboard_id, 'mode': 'markdown'}),
+            'display': leaderboard_mode != 'markdown',
+        },
+        {
+            'html': '<i class="fas fa-table fa-fw"></i> Table',
+            'url': url('forum-leaderboard', {'id': leaderboard_id}),
+            'display': leaderboard_mode == 'markdown',
+        },
+    ]) }}
+
+    <div class="container forum__leaderboard__categories">
+        {% for id, name in leaderboard_categories %}
+            <a href="{{ url('forum-leaderboard', {'id': id, 'mode': leaderboard_mode}) }}" class="forum__leaderboard__category{% if leaderboard_id == id %} forum__leaderboard__category--active{% endif %}">{{ name }}</a>
+        {% endfor %}
+    </div>
+
+    {% if leaderboard_mode == 'markdown' %}
+        <textarea class="input__textarea forum__leaderboard__markdown">{{ leaderboard_markdown }}</textarea>
+    {% else %}
+        {% for user in leaderboard_data %}
+            <div class="container forum__leaderboard__user forum__leaderboard__user--rank-{{ user.rank }}">
+                <a href="{{ url('user-profile', {'user': user.user_id}) }}" class="forum__leaderboard__user__background"></a>
+                <div class="forum__leaderboard__user__content">
+                    <div class="forum__leaderboard__user__rank">{{ user.rank|number_format }}</div>
+                    <div class="avatar forum__leaderboard__user__avatar" style="background-image:url('{{ url('user-avatar', {'user': user.user_id, 'r': 80}) }}')"></div>
+                    <div class="forum__leaderboard__user__username">{{ user.username }}</div>
+                    <div class="forum__leaderboard__user__posts">{{ user.posts|number_format }} posts</div>
+                </div>
+            </div>
+        {% endfor %}
+    {% endif %}
+{% endblock %}
diff --git a/utility.php b/utility.php
index 02bba0d4..21d4ee88 100644
--- a/utility.php
+++ b/utility.php
@@ -64,22 +64,6 @@ function pdo_prepare_array(array $keys, bool $useKeys = false, string $format =
     return implode(', ', $parts);
 }
 
-function is_local_url(string $url): bool
-{
-    $length = mb_strlen($url);
-
-    if ($length < 1) {
-        return false;
-    }
-
-    if ($url[0] === '/' && ($length > 1 ? $url[1] !== '/' : true)) {
-        return true;
-    }
-
-    $prefix = 'http' . (empty($_SERVER['HTTPS']) ? '' : 's') . '://' . $_SERVER['HTTP_HOST'] . '/';
-    return starts_with($url, $prefix);
-}
-
 function render_error(int $code, string $template = 'errors.%d'): string
 {
     return render_info(null, $code, $template);