diff --git a/include/openmc/settings.h b/include/openmc/settings.h
index 49e0ab69e1..be56e0b60e 100644
--- a/include/openmc/settings.h
+++ b/include/openmc/settings.h
@@ -15,21 +15,23 @@ namespace openmc {
 // Global variable declarations
 //==============================================================================
 
+namespace settings {
+
 // Defined on Fortran side
-extern "C" bool openmc_check_overlaps;
-extern "C" bool openmc_particle_restart_run;
-extern "C" bool openmc_photon_transport;
-extern "C" bool openmc_restart_run;
-extern "C" bool openmc_run_CE;
-extern "C" bool openmc_write_all_tracks;
-extern "C" bool openmc_write_initial_source;
+extern "C" bool check_overlaps;
+extern "C" bool particle_restart_run;
+extern "C" bool photon_transport;
+extern "C" bool restart_run;
+extern "C" bool run_CE;
+extern "C" bool write_all_tracks;
+extern "C" bool write_initial_source;
 
 // Defined in .cpp
 // TODO: Make strings instead of char* once Fortran is gone
-extern "C" char* openmc_path_input;
-extern "C" char* openmc_path_statepoint;
-extern "C" char* openmc_path_sourcepoint;
-extern "C" char* openmc_path_particle_restart;
+extern "C" char* path_input;
+extern "C" char* path_statepoint;
+extern "C" char* path_sourcepoint;
+extern "C" char* path_particle_restart;
 extern std::string path_cross_sections;
 extern std::string path_multipole;
 extern std::string path_output;
@@ -41,6 +43,8 @@ extern double temperature_tolerance;
 extern double temperature_default;
 extern std::array<double, 2> temperature_range;
 
+} // namespace settings
+
 //==============================================================================
 //! Read settings from XML file
 //! \param[in] root XML node for <settings>
diff --git a/src/initialize.cpp b/src/initialize.cpp
index 21ab93b726..dfbf418343 100644
--- a/src/initialize.cpp
+++ b/src/initialize.cpp
@@ -109,7 +109,7 @@ parse_command_line(int argc, char* argv[])
     if (arg[0] == '-') {
       if (arg == "-p" || arg == "--plot") {
         openmc_run_mode = RUN_MODE_PLOTTING;
-        openmc_check_overlaps = true;
+        settings::check_overlaps = true;
 
       } else if (arg == "-n" || arg == "--particles") {
         i += 1;
@@ -127,11 +127,11 @@ parse_command_line(int argc, char* argv[])
 
         // Set path and flag for type of run
         if (filetype == "statepoint") {
-          openmc_path_statepoint = argv[i];
-          openmc_restart_run = true;
+          settings::path_statepoint = argv[i];
+          settings::restart_run = true;
         } else if (filetype == "particle restart") {
-          openmc_path_particle_restart = argv[i];
-          openmc_particle_restart_run = true;
+          settings::path_particle_restart = argv[i];
+          settings::particle_restart_run = true;
         } else {
           std::stringstream msg;
           msg << "Unrecognized file after restart flag: " << filetype << ".";
@@ -140,7 +140,7 @@ parse_command_line(int argc, char* argv[])
         }
 
         // If its a restart run check for additional source file
-        if (openmc_restart_run && i + 1 < argc) {
+        if (settings::restart_run && i + 1 < argc) {
           // Check if it has extension we can read
           if (ends_with(argv[i+1], ".h5")) {
 
@@ -156,21 +156,21 @@ parse_command_line(int argc, char* argv[])
             }
 
             // It is a source file
-            openmc_path_sourcepoint = argv[i+1];
+            settings::path_sourcepoint = argv[i+1];
             i += 1;
 
           } else {
             // Source is in statepoint file
-            openmc_path_sourcepoint = openmc_path_statepoint;
+            settings::path_sourcepoint = settings::path_statepoint;
           }
 
         } else {
           // Source is assumed to be in statepoint file
-          openmc_path_sourcepoint = openmc_path_statepoint;
+          settings::path_sourcepoint = settings::path_statepoint;
         }
 
       } else if (arg == "-g" || arg == "--geometry-debug") {
-        openmc_check_overlaps = true;
+      settings::check_overlaps = true;
       } else if (arg == "-c" || arg == "--volume") {
         openmc_run_mode = RUN_MODE_VOLUME;
       } else if (arg == "-s" || arg == "--threads") {
@@ -200,7 +200,7 @@ parse_command_line(int argc, char* argv[])
         return OPENMC_E_UNASSIGNED;
 
       } else if (arg == "-t" || arg == "--track") {
-        openmc_write_all_tracks = true;
+        settings::write_all_tracks = true;
 
       } else {
         std::cerr << "Unknown option: " << argv[i] << '\n';
@@ -213,7 +213,7 @@ parse_command_line(int argc, char* argv[])
   }
 
   // Determine directory where XML input files are
-  if (argc > 1 && last_flag < argc) openmc_path_input = argv[last_flag + 1];
+  if (argc > 1 && last_flag < argc) settings::path_input = argv[last_flag + 1];
 
   return 0;
 }
diff --git a/src/particle.cpp b/src/particle.cpp
index 51331cea03..3dda0e7c92 100644
--- a/src/particle.cpp
+++ b/src/particle.cpp
@@ -148,7 +148,8 @@ Particle::write_restart()
 
   // Set up file name
   std::stringstream filename;
-  filename << path_output << "particle_" << openmc_current_batch << '_' << id << ".h5";
+  filename << settings::path_output << "particle_" << openmc_current_batch
+    << '_' << id << ".h5";
 
 #pragma omp critical (WriteParticleRestart)
   {
diff --git a/src/settings.F90 b/src/settings.F90
index 710a87e1e2..da514757d2 100644
--- a/src/settings.F90
+++ b/src/settings.F90
@@ -9,7 +9,7 @@ module settings
 
   ! ============================================================================
   ! ENERGY TREATMENT RELATED VARIABLES
-  logical(C_BOOL), bind(C, name='openmc_run_CE') :: run_CE = .true.  ! Run in CE mode?
+  logical(C_BOOL), bind(C, name='run_CE') :: run_CE = .true.  ! Run in CE mode?
 
   ! ============================================================================
   ! CONTINUOUS-ENERGY CROSS SECTION RELATED VARIABLES
@@ -26,7 +26,7 @@ module settings
 
   integer :: n_log_bins  ! number of bins for logarithmic grid
 
-  logical(C_BOOL), bind(C, name='openmc_photon_transport') :: photon_transport = .false.
+  logical(C_BOOL), bind(C) :: photon_transport = .false.
   integer :: electron_treatment = ELECTRON_TTB
 
   ! ============================================================================
@@ -81,13 +81,13 @@ module settings
   integer(C_INT), bind(C, name='openmc_run_mode') :: run_mode = NONE
 
   ! Restart run
-  logical(C_BOOL), bind(C, name='openmc_restart_run') :: restart_run = .false.
+  logical(C_BOOL), bind(C) :: restart_run = .false.
 
   ! The verbosity controls how much information will be printed to the screen
   ! and in logs
   integer(C_INT), bind(C, name='openmc_verbosity') :: verbosity = 7
 
-  logical(C_BOOL), bind(C, name='openmc_check_overlaps') :: check_overlaps = .false.
+  logical(C_BOOL), bind(C) :: check_overlaps = .false.
 
   ! Trace for single particle
   integer    :: trace_batch
@@ -95,17 +95,14 @@ module settings
   integer(8) :: trace_particle
 
   ! Particle tracks
-  logical(C_BOOL), bind(C, name='openmc_write_all_tracks') :: &
-       write_all_tracks = .false.
+  logical(C_BOOL), bind(C) :: write_all_tracks = .false.
   integer, allocatable :: track_identifiers(:,:)
 
   ! Particle restart run
-  logical(C_BOOL), bind(C, name='openmc_particle_restart_run') :: &
-       particle_restart_run = .false.
+  logical(C_BOOL), bind(C) :: particle_restart_run = .false.
 
   ! Write out initial source
-  logical(C_BOOL), bind(C, name='openmc_write_initial_source') :: &
-       write_initial_source = .false.
+  logical(C_BOOL), bind(C) :: write_initial_source = .false.
 
   ! Whether create fission neutrons or not. Only applied for MODE_FIXEDSOURCE
   logical :: create_fission_neutrons = .true.
diff --git a/src/settings.cpp b/src/settings.cpp
index aafa0fb237..d3896f0634 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -16,10 +16,12 @@ namespace openmc {
 // Global variables
 //==============================================================================
 
-char* openmc_path_input;
-char* openmc_path_statepoint;
-char* openmc_path_sourcepoint;
-char* openmc_path_particle_restart;
+namespace settings {
+
+char* path_input;
+char* path_statepoint;
+char* path_sourcepoint;
+char* path_particle_restart;
 std::string path_cross_sections;
 std::string path_multipole;
 std::string path_output;
@@ -31,12 +33,16 @@ double temperature_tolerance {10.0};
 double temperature_default {293.6};
 std::array<double, 2> temperature_range {0.0, 0.0};
 
+} // namespace settings
+
 //==============================================================================
 // Functions
 //==============================================================================
 
 void read_settings(pugi::xml_node* root)
 {
+  using namespace settings;
+
   // Look for deprecated cross_sections.xml file in settings.xml
   if (check_for_node(*root, "cross_sections")) {
     warning("Setting cross_sections in settings.xml has been deprecated."
diff --git a/src/source.cpp b/src/source.cpp
index 70240b10d1..8f28fcf73e 100644
--- a/src/source.cpp
+++ b/src/source.cpp
@@ -45,7 +45,7 @@ SourceDistribution::SourceDistribution(pugi::xml_node node)
       particle_ = ParticleType::neutron;
     } else if (temp_str == "photon") {
       particle_ = ParticleType::photon;
-      openmc_photon_transport = true;
+      settings::photon_transport = true;
     } else {
       fatal_error(std::string("Unknown source particle type: ") + temp_str);
     }
@@ -59,12 +59,12 @@ SourceDistribution::SourceDistribution(pugi::xml_node node)
   // Check for external source file
   if (check_for_node(node, "file")) {
     // Copy path of source file
-    path_source = get_node_value(node, "file", false, true);
+    settings::path_source = get_node_value(node, "file", false, true);
 
     // Check if source file exists
-    if (!file_exists(path_source)) {
+    if (!file_exists(settings::path_source)) {
       std::stringstream msg;
-      msg << "Source file '" << path_source <<  "' does not exist.";
+      msg << "Source file '" << settings::path_source <<  "' does not exist.";
       fatal_error(msg);
     }
 
@@ -243,16 +243,16 @@ void initialize_source()
   int64_t n;
   openmc_source_bank(&source_bank, &n);
 
-  if (path_source != "") {
+  if (settings::path_source != "") {
     // Read the source from a binary file instead of sampling from some
     // assumed source distribution
 
     std::stringstream msg;
-    msg << "Reading source file from " << path_source << "...";
+    msg << "Reading source file from " << settings::path_source << "...";
     write_message(msg, 6);
 
     // Open the binary file
-    hid_t file_id = file_open(path_source, 'r', true);
+    hid_t file_id = file_open(settings::path_source, 'r', true);
 
     // Read the file type
     std::string filetype;
@@ -282,9 +282,9 @@ void initialize_source()
   }
 
   // Write out initial source
-  if (openmc_write_initial_source) {
+  if (settings::write_initial_source) {
     write_message("Writing out initial source...", 5);
-    std::string filename = path_output + "initial_source.h5";
+    std::string filename = settings::path_output + "initial_source.h5";
     hid_t file_id = file_open(filename, 'w', true);
     write_source_bank(file_id, work_index.data(), source_bank);
     file_close(file_id);
@@ -318,7 +318,7 @@ Bank sample_external_source()
   Bank site {external_sources[i].sample()};
 
   // If running in MG, convert site % E to group
-  if (!openmc_run_CE) {
+  if (!settings::run_CE) {
     // Get pointer to rev_energy_bins array on Fortran side
     double* rev_energy_bins = rev_energy_bins_ptr();
 
@@ -357,7 +357,7 @@ extern "C" int overall_generation();
 //! Fill source bank at end of generation for fixed source simulations
 extern "C" void fill_source_bank_fixedsource()
 {
-  if (path_source.empty()) {
+  if (settings::path_source.empty()) {
     // Get pointer to source bank
     Bank* source_bank;
     int64_t n;
diff --git a/src/thermal.cpp b/src/thermal.cpp
index b63d2e6d16..229aa35bc7 100644
--- a/src/thermal.cpp
+++ b/src/thermal.cpp
@@ -153,10 +153,10 @@ ThermalScattering::calculate_xs(double E, double sqrtkT, int* i_temp,
   // Determine temperature for S(a,b) table
   double kT = sqrtkT*sqrtkT;
   int i;
-  if (temperature_method == TEMPERATURE_NEAREST) {
+  if (settings::temperature_method == TEMPERATURE_NEAREST) {
     // If using nearest temperature, do linear search on temperature
     for (i = 0; i < kTs_.size(); ++i) {
-      if (abs(kTs_[i] - kT) < K_BOLTZMANN*temperature_tolerance) {
+      if (abs(kTs_[i] - kT) < K_BOLTZMANN*settings::temperature_tolerance) {
         break;
       }
     }