diff --git a/cwltool/cwlrdf.py b/cwltool/cwlrdf.py
index 0b844df4a..890a1a3d3 100644
--- a/cwltool/cwlrdf.py
+++ b/cwltool/cwlrdf.py
@@ -9,21 +9,30 @@
 
 from .cwlviewer import CWLViewer
 from .process import Process
+from .utils import CWLObjectType
 
 
-def gather(tool: Process, ctx: ContextType) -> Graph:
+def gather(tool: Process, ctx: ContextType, inputs: CWLObjectType | None = None) -> Graph:
+    """Convert a Process with optional inputs object into a RDF Graph."""
     g = Graph()
 
     def visitor(t: CommentedMap) -> None:
         makerdf(t["id"], t, ctx, graph=g)
 
+    if inputs:
+        for inp_name in inputs:
+            for inp in tool.tool["inputs"]:
+                if inp["id"].endswith(f"#{inp_name}"):
+                    inp["rdf:value"] = inputs[inp_name]
     tool.visit(visitor)
     return g
 
 
-def printrdf(wflow: Process, ctx: ContextType, style: str) -> str:
+def printrdf(
+    wflow: Process, ctx: ContextType, style: str, inputs: CWLObjectType | None = None
+) -> str:
     """Serialize the CWL document into a string, ready for printing."""
-    rdf = gather(wflow, ctx).serialize(format=style, encoding="utf-8")
+    rdf = gather(wflow, ctx, inputs).serialize(format=style, encoding="utf-8")
     if not rdf:
         return ""
     return str(rdf, "utf-8")
diff --git a/cwltool/main.py b/cwltool/main.py
index b8d74ded0..0e19a2899 100755
--- a/cwltool/main.py
+++ b/cwltool/main.py
@@ -1152,7 +1152,9 @@ def main(
 
             if args.print_rdf:
                 print(
-                    printrdf(tool, loadingContext.loader.ctx, args.rdf_serializer),
+                    printrdf(
+                        tool, loadingContext.loader.ctx, args.rdf_serializer, job_order_object
+                    ),
                     file=stdout,
                 )
                 return 0
diff --git a/tests/test_rdfprint.py b/tests/test_rdfprint.py
index 63adb1c74..27c779f70 100644
--- a/tests/test_rdfprint.py
+++ b/tests/test_rdfprint.py
@@ -5,13 +5,25 @@
 
 from cwltool.main import main
 
-from .util import get_data
+from .util import get_data, get_main_output
 
 
 def test_rdf_print() -> None:
     assert main(["--print-rdf", get_data("tests/wf/hello_single_tool.cwl")]) == 0
 
 
+def test_rdf_print_inputs_and_defaults() -> None:
+    error_code, stdout, stderr = get_main_output(
+        ["--print-rdf", get_data("tests/wf/revsort.cwl"), get_data("tests/wf/revsort-job.json")]
+    )
+    assert error_code == 0, stderr
+    assert "revsort.cwl#workflow_input> rdf:value " in stdout
+    assert (
+        'tests/wf/revsort.cwl#workflow_input> rdfs:comment "The input file to be processed."'
+        not in stdout
+    )
+
+
 def test_rdf_print_unicode(monkeypatch: pytest.MonkeyPatch) -> None:
     """Force ASCII encoding but load UTF file with --print-rdf."""
     monkeypatch.setenv("LC_ALL", "C")