diff --git a/qiskit/circuit/parameterexpression.py b/qiskit/circuit/parameterexpression.py
index 4f6453f90f4c..2b81ddd769f6 100644
--- a/qiskit/circuit/parameterexpression.py
+++ b/qiskit/circuit/parameterexpression.py
@@ -327,8 +327,11 @@ def __rsub__(self, other):
     def __mul__(self, other):
         return self._apply_operation(operator.mul, other)
 
+    def __pos__(self):
+        return self._apply_operation(operator.mul, 1)
+
     def __neg__(self):
-        return self._apply_operation(operator.mul, -1.0)
+        return self._apply_operation(operator.mul, -1)
 
     def __rmul__(self, other):
         return self._apply_operation(operator.mul, other, reflected=True)
diff --git a/releasenotes/notes/unary_pos_for_parameterexpression-6421421b6dc20fbb.yaml b/releasenotes/notes/unary_pos_for_parameterexpression-6421421b6dc20fbb.yaml
new file mode 100644
index 000000000000..92fc63d49892
--- /dev/null
+++ b/releasenotes/notes/unary_pos_for_parameterexpression-6421421b6dc20fbb.yaml
@@ -0,0 +1,4 @@
+---
+features_circuits:
+  - |
+    :class:`.ParameterExpression` now supports the unary ``+`` operator.
diff --git a/test/python/circuit/test_parameters.py b/test/python/circuit/test_parameters.py
index 7bcc2cd35f3a..ed82f33eac97 100644
--- a/test/python/circuit/test_parameters.py
+++ b/test/python/circuit/test_parameters.py
@@ -1755,6 +1755,13 @@ def test_negated_expression(self):
 
         self.assertEqual(float(bound_expr2), 3)
 
+    def test_positive_expression(self):
+        """This tests parameter unary plus."""
+        x = Parameter("x")
+        y = +x
+        self.assertEqual(float(y.bind({x: 1})), 1.0)
+        self.assertIsInstance(+x, type(-x))
+
     def test_standard_cu3(self):
         """This tests parameter negation in standard extension gate cu3."""
         from qiskit.circuit.library import CU3Gate