diff --git a/extra/completions/_stackablectl b/extra/completions/_stackablectl
index e8717fbd..25c69764 100644
--- a/extra/completions/_stackablectl
+++ b/extra/completions/_stackablectl
@@ -659,9 +659,8 @@ repo\:"index.yaml-based repositories\: resolution (dev, test, stable) is based o
         case $line[1] in
             (credentials)
 _arguments "${_arguments_options[@]}" : \
-'-n+[Namespace in the cluster used to deploy the products]:PRODUCT_NAMESPACE: ' \
-'--product-namespace=[Namespace in the cluster used to deploy the products]:PRODUCT_NAMESPACE: ' \
-'--product-ns=[Namespace in the cluster used to deploy the products]:PRODUCT_NAMESPACE: ' \
+'-n+[Namespace in the cluster used to deploy the products]:NAMESPACE: ' \
+'--namespace=[Namespace in the cluster used to deploy the products]:NAMESPACE: ' \
 '-l+[Log level this application uses]:LOG_LEVEL: ' \
 '--log-level=[Log level this application uses]:LOG_LEVEL: ' \
 '*-d+[Provide one or more additional (custom) demo file(s)]:DEMO_FILE:_files' \
diff --git a/extra/completions/stackablectl.bash b/extra/completions/stackablectl.bash
index 5000e636..095ed06b 100644
--- a/extra/completions/stackablectl.bash
+++ b/extra/completions/stackablectl.bash
@@ -5567,17 +5567,13 @@ _stackablectl() {
             return 0
             ;;
         stackablectl__stacklet__credentials)
-            opts="-n -l -d -s -r -h -V --product-ns --product-namespace --log-level --no-cache --demo-file --stack-file --release-file --helm-repo-stable --helm-repo-test --helm-repo-dev --chart-source --help --version <PRODUCT_NAME> <STACKLET_NAME>"
+            opts="-n -l -d -s -r -h -V --namespace --log-level --no-cache --demo-file --stack-file --release-file --helm-repo-stable --helm-repo-test --helm-repo-dev --chart-source --help --version <PRODUCT_NAME> <STACKLET_NAME>"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
             fi
             case "${prev}" in
-                --product-namespace)
-                    COMPREPLY=($(compgen -f "${cur}"))
-                    return 0
-                    ;;
-                --product-ns)
+                --namespace)
                     COMPREPLY=($(compgen -f "${cur}"))
                     return 0
                     ;;
diff --git a/extra/completions/stackablectl.elv b/extra/completions/stackablectl.elv
index e4a5694b..f943defe 100644
--- a/extra/completions/stackablectl.elv
+++ b/extra/completions/stackablectl.elv
@@ -475,8 +475,7 @@ set edit:completion:arg-completer[stackablectl] = {|@words|
         }
         &'stackablectl;stacklet;credentials'= {
             cand -n 'Namespace in the cluster used to deploy the products'
-            cand --product-namespace 'Namespace in the cluster used to deploy the products'
-            cand --product-ns 'Namespace in the cluster used to deploy the products'
+            cand --namespace 'Namespace in the cluster used to deploy the products'
             cand -l 'Log level this application uses'
             cand --log-level 'Log level this application uses'
             cand -d 'Provide one or more additional (custom) demo file(s)'
diff --git a/extra/completions/stackablectl.fish b/extra/completions/stackablectl.fish
index 79b9482f..7fe840ee 100644
--- a/extra/completions/stackablectl.fish
+++ b/extra/completions/stackablectl.fish
@@ -288,7 +288,7 @@ complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and
 complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and not __fish_seen_subcommand_from credentials list help" -f -a "credentials" -d 'Display credentials for a stacklet'
 complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and not __fish_seen_subcommand_from credentials list help" -f -a "list" -d 'List deployed stacklets'
 complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and not __fish_seen_subcommand_from credentials list help" -f -a "help" -d 'Print this message or the help of the given subcommand(s)'
-complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and __fish_seen_subcommand_from credentials" -s n -l product-namespace -l product-ns -d 'Namespace in the cluster used to deploy the products' -r
+complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and __fish_seen_subcommand_from credentials" -s n -l namespace -d 'Namespace in the cluster used to deploy the products' -r
 complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and __fish_seen_subcommand_from credentials" -s l -l log-level -d 'Log level this application uses' -r
 complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and __fish_seen_subcommand_from credentials" -s d -l demo-file -d 'Provide one or more additional (custom) demo file(s)' -r -F
 complete -c stackablectl -n "__fish_stackablectl_using_subcommand stacklet; and __fish_seen_subcommand_from credentials" -s s -l stack-file -d 'Provide one or more additional (custom) stack file(s)' -r -F
diff --git a/extra/completions/stackablectl.nu b/extra/completions/stackablectl.nu
index 5bb59dd6..448f1f63 100644
--- a/extra/completions/stackablectl.nu
+++ b/extra/completions/stackablectl.nu
@@ -493,8 +493,7 @@ module completions {
   export extern "stackablectl stacklet credentials" [
     product_name: string      # The name of the product, for example 'superset'
     stacklet_name: string     # The name of the stacklet, for example 'superset'
-    --product-namespace(-n): string # Namespace in the cluster used to deploy the products
-    --product-ns: string      # Namespace in the cluster used to deploy the products
+    --namespace(-n): string   # Namespace in the cluster used to deploy the products
     --log-level(-l): string   # Log level this application uses
     --no-cache                # Do not cache the remote (default) demo, stack and release files
     --demo-file(-d): string   # Provide one or more additional (custom) demo file(s)
diff --git a/rust/stackable-cockpit/src/platform/demo/spec.rs b/rust/stackable-cockpit/src/platform/demo/spec.rs
index 75847116..0d8ca246 100644
--- a/rust/stackable-cockpit/src/platform/demo/spec.rs
+++ b/rust/stackable-cockpit/src/platform/demo/spec.rs
@@ -97,18 +97,14 @@ impl DemoSpec {
     /// - Does the demo support to be installed in the requested namespace?
     /// - Does the cluster have enough resources available to run this demo?
     #[instrument(skip_all)]
-    pub async fn check_prerequisites(
-        &self,
-        client: &Client,
-        product_namespace: &str,
-    ) -> Result<(), Error> {
+    pub async fn check_prerequisites(&self, client: &Client, namespace: &str) -> Result<(), Error> {
         debug!("Checking prerequisites before installing demo");
 
         // Returns an error if the demo doesn't support to be installed in the
         // requested namespace
-        if !self.supports_namespace(product_namespace) {
+        if !self.supports_namespace(namespace) {
             return Err(Error::UnsupportedNamespace {
-                requested: product_namespace.to_string(),
+                requested: namespace.to_owned(),
                 supported: self.supported_namespaces.clone(),
             });
         }
diff --git a/rust/stackable-cockpit/src/platform/manifests.rs b/rust/stackable-cockpit/src/platform/manifests.rs
index b92814c1..7a5df63a 100644
--- a/rust/stackable-cockpit/src/platform/manifests.rs
+++ b/rust/stackable-cockpit/src/platform/manifests.rs
@@ -62,18 +62,23 @@ pub enum Error {
 
 pub trait InstallManifestsExt {
     // TODO (Techassi): This step shouldn't care about templating the manifests nor fetching them from remote
-    #[instrument(skip_all, fields(%product_namespace))]
+    #[instrument(skip_all, fields(%namespace))]
     #[allow(async_fn_in_trait)]
     async fn install_manifests(
         manifests: &[ManifestSpec],
         parameters: &HashMap<String, String>,
-        product_namespace: &str,
+        namespace: &str,
         labels: Labels,
         client: &Client,
         transfer_client: &xfer::Client,
     ) -> Result<(), Error> {
         debug!("Installing manifests");
 
+        let mut parameters = parameters.clone();
+        // We add the NAMESPACE parameter, so that stacks/demos can use that to render e.g. the
+        // fqdn service names [which contain the namespace].
+        parameters.insert("NAMESPACE".to_owned(), namespace.to_owned());
+
         for manifest in manifests {
             match manifest {
                 ManifestSpec::HelmChart(helm_file) => {
@@ -85,7 +90,7 @@ pub trait InstallManifestsExt {
                     })?;
 
                     let helm_chart: helm::Chart = transfer_client
-                        .get(&helm_file, &Template::new(parameters).then(Yaml::new()))
+                        .get(&helm_file, &Template::new(&parameters).then(Yaml::new()))
                         .await
                         .context(FileTransferSnafu)?;
 
@@ -111,7 +116,7 @@ pub trait InstallManifestsExt {
                             chart_version: Some(&helm_chart.version),
                         },
                         Some(&values_yaml),
-                        product_namespace,
+                        namespace,
                         true,
                     )
                     .context(InstallHelmReleaseSnafu {
@@ -130,12 +135,12 @@ pub trait InstallManifestsExt {
                             })?;
 
                     let manifests = transfer_client
-                        .get(&path_or_url, &Template::new(parameters))
+                        .get(&path_or_url, &Template::new(&parameters))
                         .await
                         .context(FileTransferSnafu)?;
 
                     client
-                        .deploy_manifests(&manifests, product_namespace, labels.clone())
+                        .deploy_manifests(&manifests, namespace, labels.clone())
                         .await
                         .context(DeployManifestSnafu)?
                 }
diff --git a/rust/stackable-cockpit/src/platform/stack/spec.rs b/rust/stackable-cockpit/src/platform/stack/spec.rs
index 7e2c87e1..5bba6224 100644
--- a/rust/stackable-cockpit/src/platform/stack/spec.rs
+++ b/rust/stackable-cockpit/src/platform/stack/spec.rs
@@ -111,21 +111,17 @@ impl StackSpec {
     /// - Does the stack support to be installed in the requested namespace?
     /// - Does the cluster have enough resources available to run this stack?
     #[instrument(skip_all)]
-    pub async fn check_prerequisites(
-        &self,
-        client: &Client,
-        product_namespace: &str,
-    ) -> Result<(), Error> {
+    pub async fn check_prerequisites(&self, client: &Client, namespace: &str) -> Result<(), Error> {
         debug!("Checking prerequisites before installing stack");
 
         // Returns an error if the stack doesn't support to be installed in the
         // requested product namespace. When installing a demo, this check is
         // already done on the demo spec level, however we still need to check
         // here, as stacks can be installed on their own.
-        if !self.supports_namespace(product_namespace) {
+        if !self.supports_namespace(namespace) {
             return Err(Error::UnsupportedNamespace {
                 supported: self.supported_namespaces.clone(),
-                requested: product_namespace.to_string(),
+                requested: namespace.to_owned(),
             });
         }
 
@@ -204,7 +200,7 @@ impl StackSpec {
         &self,
         release_list: release::ReleaseList,
         operator_namespace: &str,
-        _product_namespace: &str, // TODO (@NickLarsenNZ): remove this field
+        _namespace: &str, // TODO (@NickLarsenNZ): remove this field
         chart_source: &ChartSourceType,
     ) -> Result<(), Error> {
         info!(self.release, "Trying to install release");
diff --git a/rust/stackablectl/CHANGELOG.md b/rust/stackablectl/CHANGELOG.md
index 019f653e..8daf172d 100644
--- a/rust/stackablectl/CHANGELOG.md
+++ b/rust/stackablectl/CHANGELOG.md
@@ -4,9 +4,14 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- Pass the stack/demo namespace as a templating variable `NAMESPACE` to manifests.
+  This should unblock demos to run in all namespaces, as they can template the namespace e.g. for the FQDN of services ([#355]).
+
 ### Changed
 
-- Renamed `--product-namespace` argument to `--namespace` ([#373]).
+- Renamed `--product-namespace` argument to `--namespace` ([#373], [#355]).
   - Kept `--product-namespace` as a hidden alias to be removed in a later release.
 
 ### Fixed
@@ -25,6 +30,7 @@ All notable changes to this project will be documented in this file.
 - Improve tracing and log output ([#365]).
 
 [#351]: https://github.com/stackabletech/stackable-cockpit/pull/351
+[#355]: https://github.com/stackabletech/stackable-cockpit/pull/355
 [#364]: https://github.com/stackabletech/stackable-cockpit/pull/364
 [#365]: https://github.com/stackabletech/stackable-cockpit/pull/365
 
diff --git a/rust/stackablectl/src/cmds/stacklet.rs b/rust/stackablectl/src/cmds/stacklet.rs
index eed7edcf..ab87abb8 100644
--- a/rust/stackablectl/src/cmds/stacklet.rs
+++ b/rust/stackablectl/src/cmds/stacklet.rs
@@ -48,10 +48,10 @@ pub struct StackletCredentialsArgs {
         short = 'n',
         global = true,
         default_value = DEFAULT_NAMESPACE,
-        visible_aliases(["product-ns"]),
+        aliases(["product-ns", "product-namespace"]),
         long_help = "Namespace in the cluster used to deploy the products. Use this to select
 a different namespace for credential lookup.")]
-    pub product_namespace: String,
+    pub namespace: String,
 }
 
 #[derive(Debug, Args)]
@@ -211,7 +211,7 @@ async fn credentials_cmd(args: &StackletCredentialsArgs) -> Result<String, CmdEr
 
     match get_credentials_for_product(
         &client,
-        &args.product_namespace,
+        &args.namespace,
         &args.stacklet_name,
         &args.product_name,
     )
@@ -229,7 +229,7 @@ async fn credentials_cmd(args: &StackletCredentialsArgs) -> Result<String, CmdEr
 
             let output = format!(
                 "Credentials for {} ({}) in namespace '{}':",
-                args.product_name, args.stacklet_name, args.product_namespace
+                args.product_name, args.stacklet_name, args.namespace
             );
 
             Ok(format!("{}\n\n{}", output, table))
diff --git a/rust/stackablectl/src/output/error.rs b/rust/stackablectl/src/output/error.rs
index 59cc47d7..3ec7754d 100644
--- a/rust/stackablectl/src/output/error.rs
+++ b/rust/stackablectl/src/output/error.rs
@@ -16,7 +16,7 @@ impl ContextExt for ErrorContext {
         let mut ctx = tera::Context::new();
 
         ctx.insert("default_operator_namespace", DEFAULT_OPERATOR_NAMESPACE);
-        ctx.insert("default_product_namespace", DEFAULT_NAMESPACE);
+        ctx.insert("default_namespace", DEFAULT_NAMESPACE);
 
         ctx.insert("post_hints", &self.post_hints);
         ctx.insert("pre_hints", &self.pre_hints);
diff --git a/rust/stackablectl/src/output/result.rs b/rust/stackablectl/src/output/result.rs
index 84694426..28409bc9 100644
--- a/rust/stackablectl/src/output/result.rs
+++ b/rust/stackablectl/src/output/result.rs
@@ -5,7 +5,7 @@ use crate::output::{ContextExt, OutputKind};
 #[derive(Debug, Default)]
 pub struct ResultContext {
     used_operator_namespace: String,
-    used_product_namespace: String,
+    used_namespace: String,
 
     command_hints: Vec<String>,
     post_hints: Vec<String>,
@@ -20,10 +20,10 @@ impl ContextExt for ResultContext {
         let mut ctx = tera::Context::new();
 
         ctx.insert("default_operator_namespace", DEFAULT_OPERATOR_NAMESPACE);
-        ctx.insert("default_product_namespace", DEFAULT_NAMESPACE);
+        ctx.insert("default_namespace", DEFAULT_NAMESPACE);
 
         ctx.insert("used_operator_namespace", &self.used_operator_namespace);
-        ctx.insert("used_product_namespace", &self.used_product_namespace);
+        ctx.insert("used_namespace", &self.used_namespace);
 
         ctx.insert("command_hints", &self.command_hints);
         ctx.insert("post_hints", &self.post_hints);