diff --git a/src/connector/src/sink/iceberg/mod.rs b/src/connector/src/sink/iceberg/mod.rs
index dc8cc77e010d1..ce4269851cec7 100644
--- a/src/connector/src/sink/iceberg/mod.rs
+++ b/src/connector/src/sink/iceberg/mod.rs
@@ -80,10 +80,13 @@ pub struct IcebergConfig {
     pub table_name: String, // Full name of table, must include schema name
 
     #[serde(rename = "database.name")]
-    pub database_name: Option<String>, // Database name of table
+    pub database_name: Option<String>,
+    // Database name of table
 
+    // Catalog name, can be omitted for storage catalog, but
+    // must be set for other catalogs.
     #[serde(rename = "catalog.name")]
-    pub catalog_name: String, // Catalog name.
+    pub catalog_name: Option<String>,
 
     // Catalog type supported by iceberg, such as "storage", "rest".
     // If not set, we use "storage" as default.
@@ -167,6 +170,12 @@ impl IcebergConfig {
             }
         }
 
+        if config.catalog_name.is_none() && config.catalog_type.as_deref() != Some("storage") {
+            return Err(SinkError::Config(anyhow!(
+                "catalog.name must be set for non-storage catalog"
+            )));
+        }
+
         // All configs start with "catalog." will be treated as java configs.
         config.java_catalog_props = values
             .iter()
@@ -186,6 +195,13 @@ impl IcebergConfig {
         self.catalog_type.as_deref().unwrap_or("storage")
     }
 
+    fn catalog_name(&self) -> String {
+        self.catalog_name
+            .as_ref()
+            .map(|s| s.to_string())
+            .unwrap_or_else(|| "risingwave".to_string())
+    }
+
     fn full_table_name(&self) -> Result<TableIdentifier> {
         let ret = if let Some(database_name) = &self.database_name {
             TableIdentifier::new(vec![database_name, &self.table_name])
@@ -203,12 +219,12 @@ impl IcebergConfig {
         let catalog_type = self.catalog_type().to_string();
 
         iceberg_configs.insert(CATALOG_TYPE.to_string(), catalog_type.clone());
-        iceberg_configs.insert(CATALOG_NAME.to_string(), self.catalog_name.clone());
+        iceberg_configs.insert(CATALOG_NAME.to_string(), self.catalog_name());
 
         match catalog_type.as_str() {
             "storage" => {
                 iceberg_configs.insert(
-                    format!("iceberg.catalog.{}.warehouse", self.catalog_name.clone()),
+                    format!("iceberg.catalog.{}.warehouse", self.catalog_name()),
                     self.path.clone(),
                 );
             }
@@ -216,10 +232,7 @@ impl IcebergConfig {
                 let uri = self.uri.clone().ok_or_else(|| {
                     SinkError::Iceberg(anyhow!("`catalog.uri` must be set in rest catalog"))
                 })?;
-                iceberg_configs.insert(
-                    format!("iceberg.catalog.{}.uri", self.catalog_name.clone()),
-                    uri,
-                );
+                iceberg_configs.insert(format!("iceberg.catalog.{}.uri", self.catalog_name()), uri);
             }
             _ => {
                 return Err(SinkError::Iceberg(anyhow!(
@@ -287,7 +300,7 @@ impl IcebergConfig {
             let catalog_type = self.catalog_type().to_string();
 
             iceberg_configs.insert(CATALOG_TYPE.to_string(), catalog_type.clone());
-            iceberg_configs.insert(CATALOG_NAME.to_string(), self.catalog_name.clone());
+            iceberg_configs.insert(CATALOG_NAME.to_string(), self.catalog_name());
 
             if let Some(region) = &self.region {
                 iceberg_configs.insert(
@@ -390,7 +403,7 @@ impl IcebergConfig {
 
                 jni_catalog::JniCatalog::build(
                     base_catalog_config,
-                    &self.catalog_name,
+                    self.catalog_name(),
                     catalog_impl,
                     java_catalog_props,
                 )
@@ -398,7 +411,7 @@ impl IcebergConfig {
             "mock" => Ok(Arc::new(MockCatalog {})),
             _ => {
                 bail!(
-                    "Unsupported catalog type: {}, only support `storage`, `rest`, `hive`, `sql`, `glue`, `dynamodb`",
+                    "Unsupported catalog type: {}, only support `storage`, `rest`, `hive`, `jdbc`",
                     self.catalog_type()
                 )
             }
@@ -1064,7 +1077,7 @@ mod test {
             force_append_only: false,
             table_name: "demo_table".to_string(),
             database_name: Some("demo_db".to_string()),
-            catalog_name: "demo".to_string(),
+            catalog_name: Some("demo".to_string()),
             catalog_type: Some("jdbc".to_string()),
             path: "s3://iceberg".to_string(),
             uri: Some("jdbc://postgresql://postgres:5432/iceberg".to_string()),