diff --git a/src/solid_ele/4C_solid_ele.hpp b/src/solid_ele/4C_solid_ele.hpp
index 3d7d0f9ec3d..9a07f9e4166 100644
--- a/src/solid_ele/4C_solid_ele.hpp
+++ b/src/solid_ele/4C_solid_ele.hpp
@@ -188,6 +188,12 @@ namespace Discret::Elements
              solid_ele_property_.element_technology == ElementTechnology::shell_eas_ans;
     }
 
+    [[nodiscard]] double reference_thickness() const
+      requires(dim == 2)
+    {
+      return solid_ele_property_.reference_thickness;
+    }
+
     void vis_names(std::map<std::string, int>& names) const override;
 
     void set_integration_rule(const Core::FE::GaussIntegration& integration_rule);
diff --git a/src/solid_ele/4C_solid_ele_line.cpp b/src/solid_ele/4C_solid_ele_line.cpp
index 78fefd2f056..aac7b9a73d6 100644
--- a/src/solid_ele/4C_solid_ele_line.cpp
+++ b/src/solid_ele/4C_solid_ele_line.cpp
@@ -13,6 +13,7 @@
 #include "4C_legacy_enum_definitions_element_actions.hpp"
 #include "4C_linalg_serialdensematrix.hpp"
 #include "4C_linalg_tensor.hpp"
+#include "4C_solid_ele.hpp"
 #include "4C_solid_ele_neumann_evaluator.hpp"
 #include "4C_utils_exceptions.hpp"
 
@@ -235,6 +236,24 @@ int Discret::Elements::SolidLine<dim>::evaluate_neumann(Teuchos::ParameterList&
           return params.get("total time", -1.0);
       });
 
+  const auto& load_type = condition.parameters().get<std::string>("TYPE");
+  if (load_type == "pseudo_orthopressure" || load_type == "orthopressure")
+  {
+    if constexpr (dim == 2)
+    {
+      const auto* parent_solid = dynamic_cast<const Discret::Elements::Solid<2>*>(parent_element());
+      FOUR_C_ASSERT_ALWAYS(
+          parent_solid != nullptr, "Solid line has no two-dimensional solid parent.");
+      Discret::Elements::evaluate_normal_pressure_by_element(*this, discretization, condition, lm,
+          elevec1, elemat1, total_time, parent_solid->reference_thickness());
+      return 0;
+    }
+    else
+    {
+      FOUR_C_THROW("Normal pressure on a solid line is only supported in two dimensions.");
+    }
+  }
+
   Discret::Elements::evaluate_neumann_by_element<dim>(
       *this, discretization, condition, elevec1, total_time);
   return 0;
diff --git a/src/solid_ele/4C_solid_ele_neumann_evaluator.cpp b/src/solid_ele/4C_solid_ele_neumann_evaluator.cpp
index c485b3166d5..7b3c9659caa 100644
--- a/src/solid_ele/4C_solid_ele_neumann_evaluator.cpp
+++ b/src/solid_ele/4C_solid_ele_neumann_evaluator.cpp
@@ -11,6 +11,7 @@
 #include "4C_fem_general_cell_type_traits.hpp"
 #include "4C_fem_general_element.hpp"
 #include "4C_fem_general_element_integration.hpp"
+#include "4C_fem_general_extract_values.hpp"
 #include "4C_fem_general_utils_gausspoints.hpp"
 #include "4C_fem_general_utils_local_connectivity_matrices.hpp"
 #include "4C_global_data.hpp"
@@ -21,6 +22,99 @@
 
 FOUR_C_NAMESPACE_OPEN
 
+namespace
+{
+  template <Core::FE::CellType celltype>
+  void evaluate_normal_pressure(Core::Elements::Element& element,
+      const Core::FE::Discretization& discretization, const Core::Conditions::Condition& condition,
+      const std::vector<int>& dof_index_array, Core::LinAlg::SerialDenseVector& force,
+      Core::LinAlg::SerialDenseMatrix* load_linearization, const double total_time,
+      const double reference_thickness, const std::string& displacement_state)
+  {
+    constexpr int num_nodes = Core::FE::num_nodes(celltype);
+    const int num_dof_per_node = element.num_dof_per_node(*element.nodes()[0]);
+    const auto& onoff = condition.parameters().get<std::vector<int>>("ONOFF");
+    const auto& values = condition.parameters().get<std::vector<double>>("VAL");
+    const auto& function_ids = condition.parameters().get<std::vector<std::optional<int>>>("FUNCT");
+    FOUR_C_ASSERT_ALWAYS(onoff.size() >= 2 && values.size() >= 2 && function_ids.size() >= 2,
+        "A two-dimensional pressure condition requires at least two entries in ONOFF, VAL, and "
+        "FUNCT.");
+    FOUR_C_ASSERT_ALWAYS(
+        onoff[0] == 1 && onoff[1] == 0, "Normal pressure must be activated on the first dof only.");
+
+    const auto displacement = discretization.get_state(displacement_state);
+    FOUR_C_ASSERT_ALWAYS(
+        displacement != nullptr, "Cannot get state vector '{}'.", displacement_state);
+    const std::vector<double> local_displacement =
+        Core::FE::extract_values(*displacement, dof_index_array);
+
+    Core::LinAlg::Matrix<num_nodes, 2> current_coordinates;
+    for (int node = 0; node < num_nodes; ++node)
+      for (int component = 0; component < 2; ++component)
+        current_coordinates(node, component) =
+            element.nodes()[node]->x()[component] +
+            local_displacement[node * num_dof_per_node + component];
+
+    const auto integration = Core::FE::create_gauss_integration<celltype>(
+        Discret::Elements::get_gauss_rule_stiffness_matrix<celltype>());
+    for (int gp = 0; gp < integration.num_points(); ++gp)
+    {
+      const auto xi = Core::Elements::evaluate_parameter_coordinate<celltype>(integration, gp);
+      Core::Elements::ElementNodes<celltype, 2> nodes{.coordinates = current_coordinates};
+      const auto shape = Core::Elements::evaluate_shape_functions_and_derivs<celltype>(xi, nodes);
+
+      Core::LinAlg::Matrix<2, 1> current_coordinate;
+      current_coordinate.multiply_tn(current_coordinates, shape.values);
+      const double function_factor =
+          function_ids[0].has_value() && function_ids[0].value() > 0
+              ? Global::Problem::instance()
+                    ->function_by_id<Core::Utils::FunctionOfSpaceTime>(function_ids[0].value())
+                    .evaluate(current_coordinate.as_span(), total_time, 0)
+              : 1.0;
+
+      Discret::Elements::add_normal_pressure_load<celltype>(shape, current_coordinates,
+          values[0] * function_factor * integration.weight(gp), reference_thickness,
+          num_dof_per_node, force, load_linearization);
+    }
+  }
+}  // namespace
+
+void Discret::Elements::evaluate_normal_pressure_by_element(Core::Elements::Element& element,
+    const Core::FE::Discretization& discretization, const Core::Conditions::Condition& condition,
+    const std::vector<int>& dof_index_array, Core::LinAlg::SerialDenseVector& force,
+    Core::LinAlg::SerialDenseMatrix* load_linearization, const double total_time,
+    const double reference_thickness)
+{
+  const auto& type = condition.parameters().get<std::string>("TYPE");
+  std::string displacement_state;
+  if (type == "pseudo_orthopressure")
+  {
+    displacement_state = "displacement";
+    load_linearization = nullptr;
+  }
+  else if (type == "orthopressure")
+  {
+    FOUR_C_ASSERT_ALWAYS(
+        Global::Problem::instance()->structural_dynamic_params().get<bool>("LOADLIN"),
+        "If you use NEUMANN CONDITIONS with TYPE: \"orthopressure\" you need to set "
+        "'LOADLIN: true' in 'STRUCTURAL DYNAMIC'.");
+    displacement_state = "displacement new";
+  }
+  else
+  {
+    FOUR_C_THROW("Expected a normal-pressure condition, got TYPE '{}'.", type);
+  }
+
+  using supported_celltypes =
+      Core::FE::CelltypeSequence<Core::FE::CellType::line2, Core::FE::CellType::line3>;
+  Core::FE::cell_type_switch<supported_celltypes>(element.shape(),
+      [&](auto celltype_t)
+      {
+        evaluate_normal_pressure<celltype_t()>(element, discretization, condition, dof_index_array,
+            force, load_linearization, total_time, reference_thickness, displacement_state);
+      });
+}
+
 template <int dim>
 void Discret::Elements::evaluate_neumann_by_element(Core::Elements::Element& element,
     const Core::FE::Discretization& discretization, const Core::Conditions::Condition& condition,
diff --git a/src/solid_ele/4C_solid_ele_neumann_evaluator.hpp b/src/solid_ele/4C_solid_ele_neumann_evaluator.hpp
index cbc6bacd208..9fe0d25538e 100644
--- a/src/solid_ele/4C_solid_ele_neumann_evaluator.hpp
+++ b/src/solid_ele/4C_solid_ele_neumann_evaluator.hpp
@@ -10,8 +10,12 @@
 #include "4C_config.hpp"
 
 #include "4C_fem_general_element.hpp"
+#include "4C_fem_general_element_integration.hpp"
+#include "4C_linalg_fixedsizematrix.hpp"
+#include "4C_linalg_serialdensematrix.hpp"
 #include "4C_linalg_serialdensevector.hpp"
 
+#include <array>
 #include <vector>
 
 FOUR_C_NAMESPACE_OPEN
@@ -23,6 +27,60 @@ namespace Core::FE
 
 namespace Discret::Elements
 {
+  template <Core::FE::CellType celltype>
+    requires(Core::FE::dim<celltype> == 1)
+  /*!
+   * @brief Add pressure normal to a plane solid boundary.
+   *
+   * The pressure is multiplied by the parent solid's reference thickness. If requested, this
+   * function also assembles the consistent negative load linearization used by the structural
+   * residual.
+   */
+  void add_normal_pressure_load(const Core::Elements::ShapeFunctionsAndDerivatives<celltype>& shape,
+      const Core::LinAlg::Matrix<Core::FE::num_nodes(celltype), 2>& current_coordinates,
+      const double pressure_times_weight, const double reference_thickness,
+      const int num_dof_per_node, Core::LinAlg::SerialDenseVector& force,
+      Core::LinAlg::SerialDenseMatrix* load_linearization)
+  {
+    double radial_derivative = 0.0;
+    double axial_derivative = 0.0;
+    for (int node = 0; node < Core::FE::num_nodes(celltype); ++node)
+    {
+      radial_derivative += shape.derivatives(0, node) * current_coordinates(node, 0);
+      axial_derivative += shape.derivatives(0, node) * current_coordinates(node, 1);
+    }
+
+    const std::array<double, 2> normal_measure{
+        reference_thickness * axial_derivative, -reference_thickness * radial_derivative};
+    for (int node = 0; node < Core::FE::num_nodes(celltype); ++node)
+      for (int component = 0; component < 2; ++component)
+        force[node * num_dof_per_node + component] +=
+            shape.values(node) * pressure_times_weight * normal_measure[component];
+
+    if (load_linearization == nullptr) return;
+
+    for (int force_node = 0; force_node < Core::FE::num_nodes(celltype); ++force_node)
+      for (int coordinate_node = 0; coordinate_node < Core::FE::num_nodes(celltype);
+          ++coordinate_node)
+      {
+        const double factor = shape.values(force_node) * pressure_times_weight *
+                              reference_thickness * shape.derivatives(0, coordinate_node);
+        (*load_linearization)(
+            force_node* num_dof_per_node, coordinate_node* num_dof_per_node + 1) -= factor;
+        (*load_linearization)(
+            force_node* num_dof_per_node + 1, coordinate_node * num_dof_per_node) += factor;
+      }
+  }
+
+  /*!
+   * @brief Evaluate pseudo-orthopressure or follower orthopressure on a plane solid boundary line.
+   */
+  void evaluate_normal_pressure_by_element(Core::Elements::Element& element,
+      const Core::FE::Discretization& discretization, const Core::Conditions::Condition& condition,
+      const std::vector<int>& dof_index_array, Core::LinAlg::SerialDenseVector& force,
+      Core::LinAlg::SerialDenseMatrix* load_linearization, double total_time,
+      double reference_thickness);
+
   /*!
    * @brief Evaluates a Neumann condition @p condition for the element @p element.
    *
diff --git a/tests/input_files/solid_ele_quad9_plane_strain_orthopressure.4C.yaml b/tests/input_files/solid_ele_quad9_plane_strain_orthopressure.4C.yaml
new file mode 100644
index 00000000000..b63fc23ded3
--- /dev/null
+++ b/tests/input_files/solid_ele_quad9_plane_strain_orthopressure.4C.yaml
@@ -0,0 +1,422 @@
+TITLE:
+  - "Plane-strain quarter cylinder under internal orthopressure"
+PROBLEM SIZE:
+  DIM: 2
+  ELEMENTS: 48
+  NODES: 225
+  MATERIALS: 1
+  NUMDF: 6
+PROBLEM TYPE:
+  PROBLEMTYPE: "Structure"
+IO:
+  STRUCT_STRESS: "Cauchy"
+  STRUCT_STRAIN: "GL"
+STRUCTURAL DYNAMIC:
+  DYNAMICTYPE: "Statics"
+  LOADLIN: true
+  RESULTSEVERY: 1
+  RESTARTEVERY: 0
+  TIMESTEP: 0.2
+  NUMSTEP: 5
+  MAXTIME: 1.0
+  TOLDISP: 1.0e-11
+  TOLRES: 1.0e-11
+  NORMCOMBI_RESFDISP: "Or"
+  MAXITER: 20
+  PREDICT: "TangDis"
+  LINEAR_SOLVER: 1
+SOLVER 1:
+  SOLVER: "UMFPACK"
+  NAME: "Structure_Solver"
+FUNCT1:
+  - SYMBOLIC_FUNCTION_OF_SPACE_TIME: "t"
+DESIGN LINE DIRICH CONDITIONS:
+  - E: 1
+    NUMDOF: 2
+    ONOFF: [0, 1]
+    VAL: [0.0, 0.0]
+    FUNCT: [0, 0]
+  - E: 2
+    NUMDOF: 2
+    ONOFF: [1, 0]
+    VAL: [0.0, 0.0]
+    FUNCT: [0, 0]
+DESIGN LINE NEUMANN CONDITIONS:
+  - E: 3
+    NUMDOF: 2
+    ONOFF: [1, 0]
+    VAL: [-10.0, 0.0]
+    FUNCT: [1, 0]
+    TYPE: "orthopressure"
+DLINE-NODE TOPOLOGY:
+  - "NODE 1 DLINE 1"
+  - "NODE 2 DLINE 1"
+  - "NODE 3 DLINE 1"
+  - "NODE 4 DLINE 1"
+  - "NODE 5 DLINE 1"
+  - "NODE 6 DLINE 1"
+  - "NODE 7 DLINE 1"
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+  - "44 SOLID QUAD9 187 189 207 205 188 198 206 196 197 MAT 1 KINEM linear THICKNESS 2.0 PLANE_ASSUMPTION
+    plane_strain"
+  - "45 SOLID QUAD9 199 201 219 217 200 210 218 208 209 MAT 1 KINEM linear THICKNESS 2.0 PLANE_ASSUMPTION
+    plane_strain"
+  - "46 SOLID QUAD9 201 203 221 219 202 212 220 210 211 MAT 1 KINEM linear THICKNESS 2.0 PLANE_ASSUMPTION
+    plane_strain"
+  - "47 SOLID QUAD9 203 205 223 221 204 214 222 212 213 MAT 1 KINEM linear THICKNESS 2.0 PLANE_ASSUMPTION
+    plane_strain"
+  - "48 SOLID QUAD9 205 207 225 223 206 216 224 214 215 MAT 1 KINEM linear THICKNESS 2.0 PLANE_ASSUMPTION
+    plane_strain"
+MATERIALS:
+  - MAT: 1
+    MAT_Struct_StVenantKirchhoff:
+      YOUNG: 1000.0
+      NUE: 0.3
+      DENS: 0.0
+RESULT DESCRIPTION:
+  - STRUCTURE:
+      DIS: "structure"
+      NODE: 1
+      QUANTITY: "dispx"
+      VALUE: 1.90041504119862981e-01
+      TOLERANCE: 1.0e-10
+  - STRUCTURE:
+      DIS: "structure"
+      NODE: 9
+      QUANTITY: "dispx"
+      VALUE: 1.69463775578177989e-01
+      TOLERANCE: 1.0e-10
+  - STRUCTURE:
+      DIS: "structure"
+      NODE: 217
+      QUANTITY: "dispy"
+      VALUE: 1.90041504119926208e-01
+      TOLERANCE: 1.0e-10
diff --git a/tests/list_of_tests.cmake b/tests/list_of_tests.cmake
index eafe9bd779a..b38adfe5bc8 100644
--- a/tests/list_of_tests.cmake
+++ b/tests/list_of_tests.cmake
@@ -2032,6 +2032,7 @@ __four_c_test_vtk(BASED_ON ${current} PVD_RESULT xxx-structure.pvd PVD_REFERENCE
 four_c_test(TEST_FILE solid_ele_quad4_stvk_plane_strain.4C.yaml NP 2 RETURN_AS current)
 __four_c_test_restart(BASED_ON ${current} SAME_FILE NP 2 RESTART_STEP 1)
 __four_c_test_vtk(BASED_ON ${current} PVD_RESULT xxx-structure.pvd PVD_REFERENCE ref/solid_ele_quad4_stvk_plane_strain-structure.pvd TOLERANCE 1e-08)
+four_c_test(TEST_FILE solid_ele_quad9_plane_strain_orthopressure.4C.yaml)
 four_c_test(TEST_FILE solid_ele_quad4_stvk_plane_strain_eas.4C.yaml NP 2 RETURN_AS current)
 __four_c_test_restart(BASED_ON ${current} SAME_FILE NP 2 RESTART_STEP 1)
 four_c_test(TEST_FILE solid_material_prestress_iterative_spring_dashpot.4C.yaml NP 2 RETURN_AS current)
diff --git a/unittests/solid_ele/4C_solid_ele_neumann_evaluator_test.cpp b/unittests/solid_ele/4C_solid_ele_neumann_evaluator_test.cpp
new file mode 100644
index 00000000000..f1e4f45f1e7
--- /dev/null
+++ b/unittests/solid_ele/4C_solid_ele_neumann_evaluator_test.cpp
@@ -0,0 +1,69 @@
+// This file is part of 4C multiphysics licensed under the
+// GNU Lesser General Public License v3.0 or later.
+//
+// See the LICENSE.md file in the top-level for license information.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include <gtest/gtest.h>
+
+#include "4C_solid_ele_neumann_evaluator.hpp"
+
+#include "4C_fem_general_element_integration.hpp"
+#include "4C_solid_ele_calc_lib_integration.hpp"
+
+namespace
+{
+  using namespace FourC;
+
+  TEST(PlaneNormalPressure, ReferenceThicknessAndConsistentLinearization)
+  {
+    constexpr auto celltype = Core::FE::CellType::line2;
+    constexpr double pressure = 3.2;
+    constexpr double thickness = 2.75;
+    Core::LinAlg::Matrix<2, 2> coordinates;
+    coordinates(0, 0) = 2.0;
+    coordinates(0, 1) = 0.0;
+    coordinates(1, 0) = 3.0;
+    coordinates(1, 1) = 1.0;
+
+    auto evaluate = [&](const Core::LinAlg::Matrix<2, 2>& evaluated_coordinates,
+                        Core::LinAlg::SerialDenseMatrix* load_linearization)
+    {
+      Core::LinAlg::SerialDenseVector force(4);
+      const auto integration = Core::FE::create_gauss_integration<celltype>(
+          Discret::Elements::get_gauss_rule_stiffness_matrix<celltype>());
+      for (int gp = 0; gp < integration.num_points(); ++gp)
+      {
+        const auto xi = Core::Elements::evaluate_parameter_coordinate<celltype>(integration, gp);
+        const Core::Elements::ElementNodes<celltype, 2> nodes{.coordinates = evaluated_coordinates};
+        const auto shape = Core::Elements::evaluate_shape_functions_and_derivs<celltype>(xi, nodes);
+        Discret::Elements::add_normal_pressure_load<celltype>(shape, evaluated_coordinates,
+            pressure * integration.weight(gp), thickness, 2, force, load_linearization);
+      }
+      return force;
+    };
+
+    Core::LinAlg::SerialDenseMatrix load_linearization(4, 4);
+    const auto force = evaluate(coordinates, &load_linearization);
+    EXPECT_NEAR(force[0] + force[2], pressure * thickness, 1.0e-13);
+    EXPECT_NEAR(force[1] + force[3], -pressure * thickness, 1.0e-13);
+
+    constexpr double perturbation = 1.0e-7;
+    for (int column = 0; column < 4; ++column)
+    {
+      auto coordinates_plus = coordinates;
+      auto coordinates_minus = coordinates;
+      coordinates_plus(column / 2, column % 2) += perturbation;
+      coordinates_minus(column / 2, column % 2) -= perturbation;
+      const auto force_plus = evaluate(coordinates_plus, nullptr);
+      const auto force_minus = evaluate(coordinates_minus, nullptr);
+      for (int row = 0; row < 4; ++row)
+      {
+        const double finite_difference =
+            (force_plus[row] - force_minus[row]) / (2.0 * perturbation);
+        EXPECT_NEAR(-load_linearization(row, column), finite_difference, 1.0e-7);
+      }
+    }
+  }
+}  // namespace