diff --git a/cscore/examples/httpcvstream/httpcvstream.cpp b/cscore/examples/httpcvstream/httpcvstream.cpp
index 61c3d1625e..38a00dbbf9 100644
--- a/cscore/examples/httpcvstream/httpcvstream.cpp
+++ b/cscore/examples/httpcvstream/httpcvstream.cpp
@@ -3,8 +3,8 @@
 // the WPILib BSD license file in the root directory of this project.
 
 #include <cstdio>
-#include <iostream>
 
+#include <fmt/core.h>
 #include <opencv2/core/core.hpp>
 
 #include "cscore.h"
@@ -24,11 +24,11 @@ int main() {
   for (;;) {
     uint64_t time = cvsink.GrabFrame(test);
     if (time == 0) {
-      std::cout << "error: " << cvsink.GetError() << std::endl;
+      fmt::print("error: {}\n", cvsink.GetError());
       continue;
     }
-    std::cout << "got frame at time " << time << " size " << test.size()
-              << std::endl;
+    fmt::print("got frame at time {} size ({}, {})\n", time, test.size().width,
+               test.size().height);
     cv::flip(test, flip, 0);
     cvsource.PutFrame(flip);
   }
diff --git a/cscore/examples/usbcvstream/usbcvstream.cpp b/cscore/examples/usbcvstream/usbcvstream.cpp
index dcb024d345..3635221abc 100644
--- a/cscore/examples/usbcvstream/usbcvstream.cpp
+++ b/cscore/examples/usbcvstream/usbcvstream.cpp
@@ -2,9 +2,7 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <cstdio>
-#include <iostream>
-
+#include <fmt/core.h>
 #include <opencv2/core/core.hpp>
 
 #include "cscore.h"
@@ -26,11 +24,11 @@ int main() {
   for (;;) {
     uint64_t time = cvsink.GrabFrame(test);
     if (time == 0) {
-      std::cout << "error: " << cvsink.GetError() << std::endl;
+      fmt::print("error: {}\n", cvsink.GetError());
       continue;
     }
-    std::cout << "got frame at time " << time << " size " << test.size()
-              << std::endl;
+    fmt::print("got frame at time {} size ({}, {})\n", time, test.size().width,
+               test.size().height);
     cv::flip(test, flip, 0);
     cvsource.PutFrame(flip);
   }
diff --git a/cscore/src/dev/native/cpp/main.cpp b/cscore/src/dev/native/cpp/main.cpp
index af366144f8..279d72a5e8 100644
--- a/cscore/src/dev/native/cpp/main.cpp
+++ b/cscore/src/dev/native/cpp/main.cpp
@@ -2,10 +2,10 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
+#include <fmt/core.h>
 
 #include "cscore.h"
 
 int main() {
-  std::cout << cs::GetHostname() << std::endl;
+  fmt::print("{}\n", cs::GetHostname());
 }
diff --git a/hal/src/dev/native/cpp/main.cpp b/hal/src/dev/native/cpp/main.cpp
index d31456237e..721c0f65d0 100644
--- a/hal/src/dev/native/cpp/main.cpp
+++ b/hal/src/dev/native/cpp/main.cpp
@@ -2,11 +2,11 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
+#include <fmt/core.h>
 
 #include "hal/HAL.h"
 
 int main() {
-  std::cout << "Hello World" << std::endl;
-  std::cout << HAL_GetRuntimeType() << std::endl;
+  fmt::print("Hello World\n");
+  fmt::print("{}\n", HAL_GetRuntimeType());
 }
diff --git a/ntcore/manualTests/native/rpc_speed.cpp b/ntcore/manualTests/native/rpc_speed.cpp
index 169729f679..6f9dbbf7a3 100644
--- a/ntcore/manualTests/native/rpc_speed.cpp
+++ b/ntcore/manualTests/native/rpc_speed.cpp
@@ -4,10 +4,9 @@
 
 #include <chrono>
 #include <climits>
-#include <cstdio>
-#include <iostream>
 #include <thread>
 
+#include <fmt/core.h>
 #include <support/json.h>
 
 #include "ntcore.h"
@@ -17,11 +16,11 @@ void callback1(const nt::RpcAnswer& answer) {
   try {
     params = wpi::json::from_cbor(answer.params);
   } catch (wpi::json::parse_error err) {
-    std::fputs("could not decode params?\n", stderr);
+    fmt::print(stderr, "could not decode params?\n");
     return;
   }
   if (!params.is_number()) {
-    std::fputs("did not get number\n", stderr);
+    fmt::print(stderr, "did not get number\n");
     return;
   }
   double val = params.get<double>();
@@ -44,29 +43,25 @@ int main() {
     try {
       call1_result = wpi::json::from_cbor(call1_result_str);
     } catch (wpi::json::parse_error err) {
-      std::fputs("could not decode result?\n", stderr);
+      fmt::print(stderr, "could not decode result?\n");
       return 1;
     }
     if (!call1_result.is_number()) {
-      std::fputs("result is not number?\n", stderr);
+      fmt::print(stderr, "result is not number?\n");
       return 1;
     }
   }
   auto end2 = std::chrono::high_resolution_clock::now();
   auto end = nt::Now();
-  std::cerr << "nt::Now start=" << start << " end=" << end << '\n';
-  std::cerr << "std::chrono start="
-            << std::chrono::duration_cast<std::chrono::nanoseconds>(
-                   start2.time_since_epoch())
-                   .count()
-            << " end="
-            << std::chrono::duration_cast<std::chrono::nanoseconds>(
-                   end2.time_since_epoch())
-                   .count()
-            << '\n';
-  std::fprintf(stderr, "time/call = %g us\n", (end - start) / 10.0 / 10000.0);
+  fmt::print(stderr, "nt::Now start={} end={}\n", start, end);
+  fmt::print(stderr, "std::chrono start={} end={}\n",
+             std::chrono::duration_cast<std::chrono::nanoseconds>(
+                 start2.time_since_epoch())
+                 .count(),
+             std::chrono::duration_cast<std::chrono::nanoseconds>(
+                 end2.time_since_epoch())
+                 .count());
+  fmt::print(stderr, "time/call = %g us\n", (end - start) / 10.0 / 10000.0);
   std::chrono::duration<double, std::micro> diff = end2 - start2;
-  std::cerr << "time/call = " << (diff.count() / 10000.0) << " us\n";
-
-  return 0;
+  fmt::print(stderr, "time/call = {} us\n", diff.count() / 10000.0);
 }
diff --git a/ntcore/src/dev/native/cpp/main.cpp b/ntcore/src/dev/native/cpp/main.cpp
index ba692eb749..f86301867a 100644
--- a/ntcore/src/dev/native/cpp/main.cpp
+++ b/ntcore/src/dev/native/cpp/main.cpp
@@ -2,7 +2,7 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
+#include <fmt/core.h>
 
 #include "ntcore.h"
 
@@ -11,5 +11,5 @@ int main() {
 
   nt::SetEntryValue(myValue, nt::Value::MakeString("Hello World"));
 
-  std::cout << nt::GetEntryValue(myValue)->GetString() << std::endl;
+  fmt::print("{}\n", nt::GetEntryValue(myValue)->GetString());
 }
diff --git a/simulation/halsim_gazebo/src/main/native/cpp/main.cpp b/simulation/halsim_gazebo/src/main/native/cpp/main.cpp
index 752e7c6a6b..a3d0576521 100644
--- a/simulation/halsim_gazebo/src/main/native/cpp/main.cpp
+++ b/simulation/halsim_gazebo/src/main/native/cpp/main.cpp
@@ -2,8 +2,7 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
-
+#include <fmt/core.h>
 #include <hal/Ports.h>
 
 #include "GazeboAnalogIn.h"
@@ -19,14 +18,14 @@ static HALSimGazebo halsim;
 
 extern "C" {
 int HALSIM_InitExtension(void) {
-  std::cout << "Gazebo Simulator Initializing." << std::endl;
+  fmt::print("Gazebo Simulator Initializing.\n");
 
   if (!halsim.node.Connect()) {
-    std::cerr << "Error: unable to connect to Gazebo.  Is it running?."
-              << std::endl;
+    fmt::print(stderr,
+               "Error: unable to connect to Gazebo.  Is it running?.\n");
     return -1;
   }
-  std::cout << "Gazebo Simulator Connected." << std::endl;
+  fmt::print("Gazebo Simulator Connected.\n");
 
   for (int i = 0; i < HALSimGazebo::kPWMCount; i++)
     halsim.pwms[i] = new GazeboPWM(i, &halsim);
diff --git a/simulation/halsim_ws_client/src/dev/native/cpp/main.cpp b/simulation/halsim_ws_client/src/dev/native/cpp/main.cpp
index 030a930d75..cf32a3fd95 100644
--- a/simulation/halsim_ws_client/src/dev/native/cpp/main.cpp
+++ b/simulation/halsim_ws_client/src/dev/native/cpp/main.cpp
@@ -2,9 +2,9 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
 #include <thread>
 
+#include <fmt/core.h>
 #include <hal/DriverStation.h>
 #include <hal/HALBase.h>
 #include <hal/Main.h>
@@ -21,9 +21,9 @@ int main() {
   while (cycleCount < 100) {
     std::this_thread::sleep_for(std::chrono::milliseconds(100));
     cycleCount++;
-    std::cout << "Count: " << cycleCount << std::endl;
+    fmt::print("Count: {}\n", cycleCount);
   }
 
-  std::cout << "DONE" << std::endl;
+  fmt::print("DONE\n");
   HAL_ExitMain();
 }
diff --git a/wpilibc/src/dev/native/cpp/main.cpp b/wpilibc/src/dev/native/cpp/main.cpp
index 54bf102cf3..28fac9d77b 100644
--- a/wpilibc/src/dev/native/cpp/main.cpp
+++ b/wpilibc/src/dev/native/cpp/main.cpp
@@ -2,15 +2,13 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
-
+#include <fmt/core.h>
 #include <hal/HALBase.h>
 
 #include "WPILibVersion.h"
 
 int main() {
-  std::cout << "Hello World" << std::endl;
-  std::cout << HAL_GetRuntimeType() << std::endl;
-  std::cout << GetWPILibVersion() << std::endl;
-  return 0;
+  fmt::print("Hello World\n");
+  fmt::print("{}\n", HAL_GetRuntimeType());
+  fmt::print("{}\n", GetWPILibVersion());
 }
diff --git a/wpilibcExamples/src/main/cpp/examples/PacGoat/cpp/Robot.cpp b/wpilibcExamples/src/main/cpp/examples/PacGoat/cpp/Robot.cpp
index 87b3dbd435..a679268094 100644
--- a/wpilibcExamples/src/main/cpp/examples/PacGoat/cpp/Robot.cpp
+++ b/wpilibcExamples/src/main/cpp/examples/PacGoat/cpp/Robot.cpp
@@ -4,7 +4,7 @@
 
 #include "Robot.h"
 
-#include <iostream>
+#include <fmt/core.h>
 
 #include <frc/commands/Scheduler.h>
 #include <frc/livewindow/LiveWindow.h>
@@ -53,7 +53,7 @@ void Robot::TeleopInit() {
   if (m_autonomousCommand != nullptr) {
     m_autonomousCommand->Cancel();
   }
-  std::cout << "Starting Teleop" << std::endl;
+  fmt::print("Starting Teleop\n");
 }
 
 void Robot::TeleopPeriodic() {
diff --git a/wpilibcExamples/src/main/cpp/templates/timed/cpp/Robot.cpp b/wpilibcExamples/src/main/cpp/templates/timed/cpp/Robot.cpp
index 6c04fbc9b4..577de89da1 100644
--- a/wpilibcExamples/src/main/cpp/templates/timed/cpp/Robot.cpp
+++ b/wpilibcExamples/src/main/cpp/templates/timed/cpp/Robot.cpp
@@ -4,7 +4,7 @@
 
 #include "Robot.h"
 
-#include <iostream>
+#include <fmt/core.h>
 
 #include <frc/smartdashboard/SmartDashboard.h>
 
@@ -39,7 +39,7 @@ void Robot::AutonomousInit() {
   m_autoSelected = m_chooser.GetSelected();
   // m_autoSelected = SmartDashboard::GetString("Auto Selector",
   //     kAutoNameDefault);
-  std::cout << "Auto selected: " << m_autoSelected << std::endl;
+  fmt::print("Auto selected: {}\n", m_autoSelected);
 
   if (m_autoSelected == kAutoNameCustom) {
     // Custom Auto goes here
diff --git a/wpimath/src/dev/native/cpp/main.cpp b/wpimath/src/dev/native/cpp/main.cpp
index 85398058e9..54952b7188 100644
--- a/wpimath/src/dev/native/cpp/main.cpp
+++ b/wpimath/src/dev/native/cpp/main.cpp
@@ -2,10 +2,9 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
-
+#include <fmt/core.h>
 #include <wpi/numbers>
 
 int main() {
-  std::cout << wpi::numbers::pi << std::endl;
+  fmt::print("{}\n", wpi::numbers::pi);
 }
diff --git a/wpiutil/src/dev/native/cpp/main.cpp b/wpiutil/src/dev/native/cpp/main.cpp
index ede6910134..14ddda296c 100644
--- a/wpiutil/src/dev/native/cpp/main.cpp
+++ b/wpiutil/src/dev/native/cpp/main.cpp
@@ -2,12 +2,10 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <iostream>
-
+#include "fmt/core.h"
 #include "wpi/SmallString.h"
-#include "wpi/hostname.h"
 
 int main() {
   wpi::SmallString<128> v1("Hello");
-  std::cout << v1.str() << std::endl;
+  fmt::print("{}\n", v1.str());
 }
diff --git a/wpiutil/src/test/native/cpp/spinlock_bench.cpp b/wpiutil/src/test/native/cpp/spinlock_bench.cpp
index f1199fccb6..953483755d 100644
--- a/wpiutil/src/test/native/cpp/spinlock_bench.cpp
+++ b/wpiutil/src/test/native/cpp/spinlock_bench.cpp
@@ -5,10 +5,10 @@
 #include "wpi/spinlock.h"  // NOLINT(build/include_order)
 
 #include <chrono>
-#include <iostream>
 #include <mutex>
 #include <thread>
 
+#include "fmt/core.h"
 #include "gtest/gtest.h"
 #include "wpi/mutex.h"
 
@@ -50,9 +50,8 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "std::mutex sizeof: " << sizeof(std_mutex)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("std::mutex sizeof: {} time: {} value: {}\n", sizeof(std_mutex),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thrb.join();
 
@@ -65,9 +64,9 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "std::recursive_mutex sizeof: " << sizeof(std_recursive_mutex)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("std::recursive_mutex sizeof: {} time: {} value: {}\n",
+               sizeof(std_recursive_mutex),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thrb2.join();
 
@@ -80,9 +79,8 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "wpi::mutex sizeof: " << sizeof(wpi_mutex)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("wpi::mutex sizeof: {} time: {} value: {}\n", sizeof(wpi_mutex),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thr2.join();
 
@@ -95,9 +93,9 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "wpi::recursive_mutex sizeof: " << sizeof(wpi_recursive_mutex)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("wpi::recursive_mutex sizeof: {} time: {} value: {}\n",
+               sizeof(wpi_recursive_mutex),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thr2b.join();
 
@@ -110,9 +108,8 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "spinlock sizeof: " << sizeof(spinlock)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("spinlock sizeof: {} time: {} value: {}\n", sizeof(spinlock),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thr3.join();
 
@@ -125,9 +122,9 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "recursive_spinlock1 sizeof: " << sizeof(recursive_spinlock1)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("recursive_spinlock1 sizeof: {} time: {} value: {}\n",
+               sizeof(recursive_spinlock1),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thr4.join();
 
@@ -140,9 +137,9 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "recursive_spinlock2 sizeof: " << sizeof(recursive_spinlock2)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("recursive_spinlock2 sizeof: {} time: {} value: {}\n",
+               sizeof(recursive_spinlock2),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thr4b.join();
 
@@ -155,9 +152,9 @@ TEST(SpinlockTest, Benchmark) {
       ++value;
     }
     auto stop = high_resolution_clock::now();
-    std::cout << "recursive_spinlock sizeof: " << sizeof(recursive_spinlock)
-              << " time: " << duration_cast<microseconds>(stop - start).count()
-              << " value: " << value << "\n";
+    fmt::print("recursive_spinlock sizeof: {} time: {} value: {}\n",
+               sizeof(recursive_spinlock),
+               duration_cast<microseconds>(stop - start).count(), value);
   });
   thr4c.join();
 }