diff --git a/cpp/src/arrow/flight/test_util.cc b/cpp/src/arrow/flight/test_util.cc
index bd2fd5dc81159..aa10d9a7da822 100644
--- a/cpp/src/arrow/flight/test_util.cc
+++ b/cpp/src/arrow/flight/test_util.cc
@@ -55,7 +55,7 @@ Status TestServer::Start(const std::vector<std::string>& extra_args) {
   args.insert(args.end(), extra_args.begin(), extra_args.end());
   server_process_->SetArgs(args);
   ARROW_RETURN_NOT_OK(server_process_->Execute());
-  std::cout << "Server running with pid " << server_process_->id() << std::endl;
+  std::cout << "Server running with pid " << server_process_->pid() << std::endl;
   return Status::OK();
 }
 
diff --git a/cpp/src/arrow/testing/process.cc b/cpp/src/arrow/testing/process.cc
index 4e555c2b14b0e..bd2c5d6472e48 100644
--- a/cpp/src/arrow/testing/process.cc
+++ b/cpp/src/arrow/testing/process.cc
@@ -268,7 +268,7 @@ class Process::Impl {
 #endif
   }
 
-  uint64_t id() {
+  uint64_t pid() {
     if (!process_) {
       return 0;
     }
@@ -296,5 +296,5 @@ Status Process::Execute() { return impl_->Execute(); }
 
 bool Process::IsRunning() { return impl_->IsRunning(); }
 
-uint64_t Process::id() { return impl_->id(); }
+uint64_t Process::pid() { return impl_->pid(); }
 }  // namespace arrow::util
diff --git a/cpp/src/arrow/testing/process.h b/cpp/src/arrow/testing/process.h
index 9e711baf7ad9a..d4d2ae124f427 100644
--- a/cpp/src/arrow/testing/process.h
+++ b/cpp/src/arrow/testing/process.h
@@ -37,7 +37,7 @@ class ARROW_TESTING_EXPORT Process {
   void IgnoreStderr();
   Status Execute();
   bool IsRunning();
-  uint64_t id();
+  uint64_t pid();
 
  private:
   class Impl;