diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2601623..e2e0691d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,7 +67,7 @@ ENDIF()
 
 # -- [ Determine target processor
 SET(CPUINFO_TARGET_PROCESSOR "${CMAKE_SYSTEM_PROCESSOR}")
-IF(CMAKE_SYSTEM_NAME MATCHES "FreeBSD" AND CPUINFO_TARGET_PROCESSOR STREQUAL "amd64")
+IF(CMAKE_SYSTEM_NAME MATCHES "(FreeBSD|NetBSD)" AND CPUINFO_TARGET_PROCESSOR STREQUAL "amd64")
   SET(CPUINFO_TARGET_PROCESSOR "AMD64")
 ENDIF()
 IF(IS_APPLE_OS AND CMAKE_OSX_ARCHITECTURES MATCHES "^(x86_64|arm64.*)$")
@@ -108,7 +108,7 @@ IF(NOT CMAKE_SYSTEM_NAME)
       "Target operating system is not specified. "
       "cpuinfo will compile, but cpuinfo_initialize() will always fail.")
   SET(CPUINFO_SUPPORTED_PLATFORM FALSE)
-ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Windows|WindowsStore|CYGWIN|MSYS|Darwin|Linux|Android|FreeBSD|Emscripten)$")
+ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Windows|WindowsStore|CYGWIN|MSYS|Darwin|Linux|Android|FreeBSD|NetBSD|Emscripten)$")
   IF(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.14" AND NOT IS_APPLE_OS)
     MESSAGE(WARNING
       "Target operating system \"${CMAKE_SYSTEM_NAME}\" is not supported in cpuinfo. "
@@ -181,7 +181,7 @@ IF(CPUINFO_SUPPORTED_PLATFORM)
       LIST(APPEND CPUINFO_SRCS src/x86/mach/init.c)
     ELSEIF(CMAKE_SYSTEM_NAME MATCHES "^(Windows|WindowsStore|CYGWIN|MSYS)$")
       LIST(APPEND CPUINFO_SRCS src/x86/windows/init.c)
-    ELSEIF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+    ELSEIF(CMAKE_SYSTEM_NAME MATCHES "(FreeBSD|NetBSD)")
       LIST(APPEND CPUINFO_SRCS src/x86/freebsd/init.c)
     ENDIF()
   ELSEIF(CMAKE_SYSTEM_NAME MATCHES "^Windows" AND CPUINFO_TARGET_PROCESSOR MATCHES "^(ARM64|arm64)$")
@@ -240,11 +240,11 @@ IF(CPUINFO_SUPPORTED_PLATFORM)
       src/linux/processors.c)
   ELSEIF(IS_APPLE_OS)
     LIST(APPEND CPUINFO_SRCS src/mach/topology.c)
-  ELSEIF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+  ELSEIF(CMAKE_SYSTEM_NAME MATCHES "(FreeBSD|NetBSD)")
     LIST(APPEND CPUINFO_SRCS src/freebsd/topology.c)
   ENDIF()
 
-  IF(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android" OR CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+  IF(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android" OR CMAKE_SYSTEM_NAME MATCHES "(FreeBSD|NetBSD)")
     SET(CMAKE_THREAD_PREFER_PTHREAD TRUE)
     SET(THREADS_PREFER_PTHREAD_FLAG TRUE)
     FIND_PACKAGE(Threads REQUIRED)
@@ -309,7 +309,7 @@ IF(CPUINFO_SUPPORTED_PLATFORM)
     TARGET_LINK_LIBRARIES(cpuinfo_internals PUBLIC ${CMAKE_THREAD_LIBS_INIT})
     TARGET_COMPILE_DEFINITIONS(cpuinfo PRIVATE _GNU_SOURCE=1)
     TARGET_COMPILE_DEFINITIONS(cpuinfo_internals PRIVATE _GNU_SOURCE=1)
-  ELSEIF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+  ELSEIF(CMAKE_SYSTEM_NAME MATCHES "(FreeBSD|NetBSD)")
     TARGET_LINK_LIBRARIES(cpuinfo PUBLIC ${CMAKE_THREAD_LIBS_INIT})
     TARGET_LINK_LIBRARIES(cpuinfo_internals PUBLIC ${CMAKE_THREAD_LIBS_INIT})
   ENDIF()
diff --git a/src/freebsd/topology.c b/src/freebsd/topology.c
index 675a81f8..7818aa0e 100644
--- a/src/freebsd/topology.c
+++ b/src/freebsd/topology.c
@@ -20,6 +20,7 @@ static int sysctl_int(const char* name) {
 	return value;
 }
 
+#if defined(__FreeBSD__)
 static char* sysctl_str(const char* name) {
 	size_t value_size = 0;
 	if (sysctlbyname(name, NULL, &value_size, NULL, 0) != 0) {
@@ -42,6 +43,7 @@ static char* sysctl_str(const char* name) {
 	}
 	return value;
 }
+#endif
 
 struct cpuinfo_freebsd_topology cpuinfo_freebsd_detect_topology(void) {
 	struct cpuinfo_freebsd_topology topology = {
@@ -50,6 +52,7 @@ struct cpuinfo_freebsd_topology cpuinfo_freebsd_detect_topology(void) {
 		.threads_per_core = 0,
 		.threads = 0,
 	};
+#if defined(__FreeBSD__)
 	char* topology_spec = sysctl_str("kern.sched.topology_spec");
 	if (!topology_spec) {
 		return topology;
@@ -94,6 +97,19 @@ struct cpuinfo_freebsd_topology cpuinfo_freebsd_detect_topology(void) {
 		topology.threads_per_core);
 	topology.threads = topology.threads_per_core * topology.cores;
 	return topology;
+#elif defined(__NetBSD__)
+	topology.cores = sysctl_int("hw.ncpu");
+	if (topology.cores == 0) {
+		goto fail;
+	}
+	cpuinfo_log_debug("netbsd topology: cores = %d", topology.cores);
+	/* more details need active identification of the CPU, no sysctl available */
+	/* TODO: improve */
+	topology.threads = topology.cores;
+	topology.packages = 1;
+	topology.threads_per_core = 1;
+	return topology;
+#endif
 fail:
 	topology.packages = 0;
 	return topology;
diff --git a/src/init.c b/src/init.c
index 81d5721c..10f70160 100644
--- a/src/init.c
+++ b/src/init.c
@@ -24,7 +24,7 @@ bool CPUINFO_ABI cpuinfo_initialize(void) {
 #if CPUINFO_ARCH_X86 || CPUINFO_ARCH_X86_64
 #if defined(__MACH__) && defined(__APPLE__)
 	pthread_once(&init_guard, &cpuinfo_x86_mach_init);
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__NetBSD__)
 	pthread_once(&init_guard, &cpuinfo_x86_freebsd_init);
 #elif defined(__linux__)
 	pthread_once(&init_guard, &cpuinfo_x86_linux_init);