diff --git a/.changeset/gorgeous-snakes-drum.md b/.changeset/gorgeous-snakes-drum.md
new file mode 100644
index 0000000..9bd79dd
--- /dev/null
+++ b/.changeset/gorgeous-snakes-drum.md
@@ -0,0 +1,5 @@
+---
+"@openproject/helm-charts": minor
+---
+
+- allow setting `tmpStorageClassName` for /tmp and /app/tmp volumes
diff --git a/charts/openproject/templates/_helpers.tpl b/charts/openproject/templates/_helpers.tpl
index ba7f0f4..4989b58 100644
--- a/charts/openproject/templates/_helpers.tpl
+++ b/charts/openproject/templates/_helpers.tpl
@@ -93,6 +93,9 @@ securityContext:
     volumeClaimTemplate:
       spec:
         accessModes: ["ReadWriteOnce"]
+        {{- if or .Values.persistence.tmpStorageClassName .Values.persistence.storageClassName }}
+        storageClassName: {{ coalesce .Values.persistence.tmpStorageClassName .Values.persistence.storageClassName }}
+        {{- end }}
         resources:
           requests:
             storage: {{ .Values.openproject.tmpVolumesStorage }}
@@ -103,6 +106,9 @@ securityContext:
     volumeClaimTemplate:
       spec:
         accessModes: ["ReadWriteOnce"]
+        {{- if or .Values.persistence.tmpStorageClassName .Values.persistence.storageClassName }}
+        storageClassName: {{ coalesce .Values.persistence.tmpStorageClassName .Values.persistence.storageClassName }}
+        {{- end }}
         resources:
           requests:
             storage: {{ .Values.openproject.tmpVolumesStorage }}
diff --git a/charts/openproject/values.yaml b/charts/openproject/values.yaml
index 72d33b9..44b12ef 100644
--- a/charts/openproject/values.yaml
+++ b/charts/openproject/values.yaml
@@ -379,6 +379,9 @@ persistence:
   ## Define the class of PV.
   storageClassName:
 
+  ## Define the class of PV for the tmpVolumes.
+  tmpStorageClassName:
+
 ## Whether to use an S3-compatible object storage to store OpenProject attachments.
 ## If this is enabled, files will NOT be stored in the mounted volume configured in `persistence` above.
 ## The volume will not be used at all, so it `persistence.enabled` should be set to `false` in this case.