diff --git a/config.yaml b/config.yaml
index abe37c0..e64350b 100644
--- a/config.yaml
+++ b/config.yaml
@@ -76,6 +76,26 @@ rtc-relay:
 # Admin URL
 admin-url: http://localhost:3001
 
+# Global banner. It can be used to notify about an upcoming maintenance operation for example
+banner:
+  # Specify whether the banner should be shown or not
+  enabled: true
+
+  # Optional expiration time for the banner. Set to 0 to show the message forever
+  expire: 1641801081
+
+  # Nature of the banner. It can be either "information", "warning", "success"
+  nature: warning
+
+  # The message of the banner, available in different languages
+  message:
+    fr: Une maintenance planifiée va provoquer une interruption de service de quelques minutes.
+    en: A planned maintenance will provoke a short unavailability of the service.
+
+  # Optional URL to "learn more" about the message. Leave an empty value to disable
+  link: https://about.communiquons.org/
+
+
 # List of #Forez groups
 #
 # This option allows to enable some extra features for these groups
diff --git a/src/api_data/server_config.rs b/src/api_data/server_config.rs
index 1037495..c701161 100644
--- a/src/api_data/server_config.rs
+++ b/src/api_data/server_config.rs
@@ -7,7 +7,7 @@ use crate::constants::{conservation_policy, MIN_SUPPORTED_MOBILE_VERSION, passwo
 use crate::constants::accounts_info_policy::{MAX_FIRST_NAME_LENGTH, MAX_LAST_NAME_LENGTH, MAX_LOCATION_LENGTH, MIN_FIRST_NAME_LENGTH, MIN_LAST_NAME_LENGTH};
 use crate::constants::conversations::{ALLOWED_CONVERSATION_FILES_TYPES, CONVERSATION_FILES_MAX_SIZE, CONVERSATION_WRITING_EVENT_INTERVAL, CONVERSATION_WRITING_EVENT_LIFETIME, MAX_CONV_IMAGE_MESSAGE_WIDTH, MAX_CONV_LOGO_HEIGHT, MAX_CONV_LOGO_WIDTH, MAX_CONV_MESSAGE_THUMBNAIL_HEIGHT, MAX_CONV_MESSAGE_THUMBNAIL_WIDTH, MAX_CONVERSATION_MESSAGE_LENGTH, MAX_CONVERSATION_NAME_LENGTH, MIN_CONVERSATION_MESSAGE_LENGTH};
 use crate::data::api_client::APIClient;
-use crate::data::config::conf;
+use crate::data::config::{Banner, conf};
 
 #[derive(Serialize)]
 struct NotificationsConfig {
@@ -72,6 +72,7 @@ pub struct ServerConfig {
     play_store_url: &'static str,
     android_direct_download_url: String,
 
+    banner: Option<&'static Banner>,
     push_notifications: NotificationsConfig,
     password_policy: PasswordPolicy,
     data_conservation_policy: DataConservationPolicy,
@@ -89,6 +90,11 @@ impl ServerConfig {
             play_store_url: &conf().play_store_url,
             android_direct_download_url: conf().android_direct_download_url.clone(),
 
+            banner: match conf().banner.as_ref().map(|b| b.is_visible()).unwrap_or(false) {
+                true => conf().banner.as_ref(),
+                false => None,
+            },
+
             push_notifications: NotificationsConfig {
                 has_firebase: c.is_firebase_available(),
                 has_independent: conf().is_independent_push_notifications_service_enabled(),
diff --git a/src/data/config.rs b/src/data/config.rs
index eb09144..379dd23 100644
--- a/src/data/config.rs
+++ b/src/data/config.rs
@@ -1,8 +1,10 @@
+use std::collections::HashMap;
 use std::error::Error;
 
 use yaml_rust::{Yaml, YamlLoader};
 
 use crate::data::group_id::GroupID;
+use crate::utils::date_utils::time;
 
 /// Server configuration
 ///
@@ -35,6 +37,31 @@ pub struct IndependentPushService {
     pub public_url: String,
 }
 
+
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum BannerNature {
+    Information,
+    Warning,
+    Success,
+}
+
+#[derive(Debug, serde::Serialize)]
+pub struct Banner {
+    pub enabled: bool,
+    pub expire: Option<u64>,
+    pub nature: BannerNature,
+    pub message: HashMap<String, String>,
+    pub link: Option<String>,
+}
+
+impl Banner {
+    pub fn is_visible(&self) -> bool {
+        self.enabled &&
+            self.expire.map(|v| v < 1 || v > time()).unwrap_or(true)
+    }
+}
+
 #[derive(Debug)]
 pub struct Config {
     pub port: u64,
@@ -54,6 +81,7 @@ pub struct Config {
     pub database: DatabaseConfig,
     pub rtc_relay: Option<RtcRelayConfig>,
     pub admin_url: String,
+    pub banner: Option<Banner>,
     pub forez_groups: Vec<GroupID>,
 }
 
@@ -140,6 +168,28 @@ impl Config {
             })
         };
 
+        let parsed_banner = &parsed["banner"];
+        let banner = match parsed_banner.is_badvalue() {
+            true => None,
+            false => Some(Banner {
+                enabled: Self::yaml_bool(parsed_banner, "enabled"),
+                expire: match Self::yaml_u64(parsed_banner, "expire") {
+                    0 => None,
+                    v => Some(v)
+                },
+                nature: match Self::yaml_str(parsed_banner, "nature").as_str() {
+                    "information" => BannerNature::Information,
+                    "warning" => BannerNature::Warning,
+                    "success" => BannerNature::Success,
+                    v => panic!("Invalid banner nature: {} !", v)
+                },
+                message: parsed_banner["message"].as_hash().unwrap().iter()
+                    .map(|(k, v)| (k.as_str().unwrap().to_string(), v.as_str().unwrap().to_string()))
+                    .collect(),
+                link: parsed_banner["link"].as_str().map(|s| s.to_string()),
+            })
+        };
+
         let forez_groups = match &parsed["forez_groups"] {
             Yaml::BadValue => vec![],
             _ => {
@@ -183,6 +233,8 @@ impl Config {
 
             admin_url: Self::yaml_str(parsed, "admin-url"),
 
+            banner,
+
             forez_groups,
         };