diff --git a/ct/headers/nagios b/ct/headers/nagios
new file mode 100644
index 000000000..a69594814
--- /dev/null
+++ b/ct/headers/nagios
@@ -0,0 +1,6 @@
+    _   __            _           
+   / | / /___ _____ _(_)___  _____
+  /  |/ / __ `/ __ `/ / __ \/ ___/
+ / /|  / /_/ / /_/ / / /_/ (__  ) 
+/_/ |_/\__,_/\__, /_/\____/____/  
+            /____/                
diff --git a/ct/nagios.sh b/ct/nagios.sh
new file mode 100644
index 000000000..bff5bea14
--- /dev/null
+++ b/ct/nagios.sh
@@ -0,0 +1,107 @@
+#!/usr/bin/env bash
+source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/build.func)
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: GitHub Copilot (GPT-5.3-Codex)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://github.com/NagiosEnterprises/nagioscore
+
+APP="Nagios"
+var_tags="${var_tags:-monitoring;alerts;infrastructure}"
+var_cpu="${var_cpu:-2}"
+var_ram="${var_ram:-2048}"
+var_disk="${var_disk:-20}"
+var_os="${var_os:-debian}"
+var_version="${var_version:-13}"
+var_unprivileged="${var_unprivileged:-1}"
+
+header_info "$APP"
+variables
+color
+catch_errors
+
+function update_script() {
+  header_info
+  check_container_storage
+  check_container_resources
+
+  if [[ ! -f /usr/local/nagios/etc/nagios.cfg ]]; then
+    msg_error "No ${APP} Installation Found!"
+    exit
+  fi
+
+  local core_update=0
+  local plugins_update=0
+
+  if check_for_gh_release "nagios" "NagiosEnterprises/nagioscore"; then
+    core_update=1
+  fi
+
+  if check_for_gh_release "nagios-plugins" "nagios-plugins/nagios-plugins"; then
+    plugins_update=1
+  fi
+
+  if [[ "$core_update" == "1" || "$plugins_update" == "1" ]]; then
+    msg_info "Stopping Services"
+    systemctl stop nagios
+    systemctl stop apache2
+    msg_ok "Stopped Services"
+
+    msg_info "Backing up Configuration"
+    cp -a /usr/local/nagios/etc /opt/nagios-etc-backup
+    msg_ok "Backed up Configuration"
+
+    if [[ "$core_update" == "1" ]]; then
+      CLEAN_INSTALL=1 fetch_and_deploy_gh_release "nagios" "NagiosEnterprises/nagioscore" "tarball"
+
+      msg_info "Building Nagios Core"
+      cd /opt/nagios
+      $STD ./configure --with-httpd-conf=/etc/apache2/sites-enabled
+      $STD make all
+      $STD make install-groups-users
+      usermod -a -G nagios www-data
+      $STD make install
+      $STD make install-daemoninit
+      $STD make install-commandmode
+      $STD make install-config
+      $STD make install-webconf
+      a2enmod rewrite >/dev/null 2>&1
+      a2enmod cgi >/dev/null 2>&1
+      msg_ok "Built Nagios Core"
+    fi
+
+    if [[ "$plugins_update" == "1" ]]; then
+      CLEAN_INSTALL=1 fetch_and_deploy_gh_release "nagios-plugins" "nagios-plugins/nagios-plugins" "tarball"
+
+      msg_info "Building Nagios Plugins"
+      cd /opt/nagios-plugins
+      $STD ./tools/setup
+      $STD ./configure
+      $STD make
+      $STD make install
+      msg_ok "Built Nagios Plugins"
+    fi
+
+    msg_info "Restoring Configuration"
+    rm -rf /usr/local/nagios/etc
+    cp -a /opt/nagios-etc-backup /usr/local/nagios/etc
+    rm -rf /opt/nagios-etc-backup
+    msg_ok "Restored Configuration"
+
+    msg_info "Starting Services"
+    systemctl start apache2
+    systemctl start nagios
+    msg_ok "Started Services"
+
+    msg_ok "Updated successfully!"
+  fi
+  exit
+}
+
+start
+build_container
+description
+
+msg_ok "Completed Successfully!\n"
+echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
+echo -e "${INFO}${YW} Access it using the following URL:${CL}"
+echo -e "${TAB}${GATEWAY}${BGN}http://${IP}/nagios${CL}"
diff --git a/install/nagios-install.sh b/install/nagios-install.sh
new file mode 100644
index 000000000..fea71f54f
--- /dev/null
+++ b/install/nagios-install.sh
@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: GitHub Copilot (GPT-5.3-Codex)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://github.com/NagiosEnterprises/nagioscore
+
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+msg_info "Installing Dependencies"
+$STD apt install -y \
+  autoconf \
+  automake \
+  gcc \
+  libc6 \
+  libgd-dev \
+  libmcrypt-dev \
+  libnet-snmp-perl \
+  libssl-dev \
+  make \
+  openssl \
+  php \
+  apache2 \
+  apache2-utils \
+  build-essential \
+  bc \
+  dc \
+  gawk \
+  gperf \
+  gettext \
+  snmp \
+  unzip \
+  wget
+msg_ok "Installed Dependencies"
+
+fetch_and_deploy_gh_release "nagios" "NagiosEnterprises/nagioscore" "tarball"
+
+msg_info "Building Nagios Core"
+cd /opt/nagios
+$STD ./configure --with-httpd-conf=/etc/apache2/sites-enabled
+$STD make all
+$STD make install-groups-users
+usermod -a -G nagios www-data
+$STD make install
+$STD make install-daemoninit
+$STD make install-commandmode
+$STD make install-config
+$STD make install-webconf
+a2enmod rewrite >/dev/null 2>&1
+a2enmod cgi >/dev/null 2>&1
+msg_ok "Built Nagios Core"
+
+fetch_and_deploy_gh_release "nagios-plugins" "nagios-plugins/nagios-plugins" "tarball"
+
+msg_info "Building Nagios Plugins"
+cd /opt/nagios-plugins
+$STD ./tools/setup
+$STD ./configure
+$STD make
+$STD make install
+msg_ok "Built Nagios Plugins"
+
+msg_info "Configuring Web Authentication"
+htpasswd -bc /usr/local/nagios/etc/htpasswd.users nagiosadmin nagiosadmin
+chown root:www-data /usr/local/nagios/etc/htpasswd.users
+chmod 640 /usr/local/nagios/etc/htpasswd.users
+msg_ok "Configured Web Authentication"
+
+msg_info "Starting Services"
+systemctl enable -q --now apache2
+systemctl enable -q --now nagios
+systemctl restart apache2
+systemctl restart nagios
+msg_ok "Started Services"
+
+motd_ssh
+customize
+cleanup_lxc