diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index aa7457bc1..aff0b7fa5 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -43,6 +43,7 @@ For example `ViewUsage` elements are no longer rendered in _parts_ compartments.
 - https://github.com/eclipse-syson/syson/issues/1949[#1949] [diagrams] Allow redefining a `PartUsage` with the same name as the redefined usage.
 - https://github.com/eclipse-syson/syson/issues/1863[#1863] [diagrams] Dropping an elements on a diagram which is already visible gives feedback again.
 - https://github.com/eclipse-syson/syson/issues/2026[#2026] [explorer] Fix an issue where creating a new model using the _Create a new model_ action in the _Explorer_ view was not adding the ".sysml" extension to the model name.
+- https://github.com/eclipse-syson/syson/issues/2023[#2023] [diagrans] On diagrams, `ConnectionDefinition` graphical nodes are now correctly labelled as `«connection def»`.
 
 === Improvements
 
diff --git a/backend/services/syson-diagram-services/src/main/java/org/eclipse/syson/diagram/services/utils/MultiLineLabelSwitch.java b/backend/services/syson-diagram-services/src/main/java/org/eclipse/syson/diagram/services/utils/MultiLineLabelSwitch.java
index 88d1bb602..7a8b94804 100644
--- a/backend/services/syson-diagram-services/src/main/java/org/eclipse/syson/diagram/services/utils/MultiLineLabelSwitch.java
+++ b/backend/services/syson-diagram-services/src/main/java/org/eclipse/syson/diagram/services/utils/MultiLineLabelSwitch.java
@@ -30,6 +30,7 @@
 import org.eclipse.syson.sysml.Comment;
 import org.eclipse.syson.sysml.ConcernDefinition;
 import org.eclipse.syson.sysml.ConcernUsage;
+import org.eclipse.syson.sysml.ConnectionDefinition;
 import org.eclipse.syson.sysml.ConstraintDefinition;
 import org.eclipse.syson.sysml.ConstraintUsage;
 import org.eclipse.syson.sysml.Definition;
@@ -76,6 +77,7 @@
 import org.eclipse.syson.sysml.ViewUsage;
 import org.eclipse.syson.sysml.VisibilityKind;
 import org.eclipse.syson.sysml.helper.LabelConstants;
+import org.eclipse.syson.sysml.textual.SysMLv2Keywords;
 import org.eclipse.syson.sysml.util.SysmlSwitch;
 
 /**
@@ -361,6 +363,22 @@ public String caseConstraintUsage(ConstraintUsage object) {
         return label.toString();
     }
 
+    @Override
+    public String caseConnectionDefinition(ConnectionDefinition object) {
+        StringBuilder label = new StringBuilder();
+        label
+                .append(this.getBasicNamePrefix(object))
+                .append(LabelConstants.OPEN_QUOTE)
+                .append(SysMLv2Keywords.CONNECTION)
+                .append(LabelConstants.SPACE)
+                .append(SysMLv2Keywords.DEF)
+                .append(LabelConstants.CLOSE_QUOTE)
+                .append(LabelConstants.CR)
+                .append(this.caseElement(object))
+                .append(this.labelService.getSubclassificationLabel(object));
+        return label.toString();
+    }
+
     @Override
     public String caseDocumentation(Documentation object) {
         StringBuilder label = new StringBuilder();
diff --git a/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc b/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc
index a8c5d1c11..9745bd8d3 100644
--- a/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc
+++ b/doc/content/modules/user-manual/pages/release-notes/2026.3.0.adoc
@@ -19,6 +19,7 @@ It's not recommended for production use.
 
 ** Fix an issue where some type of `Elements` could appear in the wrong compartment if they shared a common type with said compartment, for example `ViewUsage` elements could appear in the _parts_ compartment since they extends `PartUsage`.
 ** Allow redefining a `PartUsage` with the same name as the redefined `Usage`.
+** Fix an issue where `ConnectionDefinition` graphical nodes where incorrectly labelled as `«part def»` instead of `«connection def»`.
 
 * In textual import/export: