diff --git a/arch/x86/core/ia32/cache.c b/arch/x86/core/ia32/cache.c
index b04290d8a13118..b7ce37a07f2ccc 100644
--- a/arch/x86/core/ia32/cache.c
+++ b/arch/x86/core/ia32/cache.c
@@ -16,7 +16,6 @@
 #include <toolchain.h>
 #include <cache.h>
 #include <stdbool.h>
-#include <cache.h>
 
 /*
  * these functions are defined in cache_s.S
diff --git a/arch/x86/include/ia32/kernel_arch_data.h b/arch/x86/include/ia32/kernel_arch_data.h
index 6974be6e0e47a9..2457fbd765b3b8 100644
--- a/arch/x86/include/ia32/kernel_arch_data.h
+++ b/arch/x86/include/ia32/kernel_arch_data.h
@@ -52,8 +52,6 @@
 
 #ifndef _ASMLANGUAGE
 
-#include <sys/util.h>
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/boards/posix/nrf52_bsim/trace_hook.c b/boards/posix/nrf52_bsim/trace_hook.c
index 89436c1d404b1f..fde0ab03a612c4 100644
--- a/boards/posix/nrf52_bsim/trace_hook.c
+++ b/boards/posix/nrf52_bsim/trace_hook.c
@@ -6,7 +6,6 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
-#include <stdio.h>
 #include <init.h>
 #include "bs_tracing.h"
 #include "posix_board_if.h"
diff --git a/drivers/bluetooth/hci/userchan.c b/drivers/bluetooth/hci/userchan.c
index 3b34c2fc54a00d..c094b619bee185 100644
--- a/drivers/bluetooth/hci/userchan.c
+++ b/drivers/bluetooth/hci/userchan.c
@@ -16,7 +16,6 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <poll.h>
-#include <errno.h>
 #include <sys/socket.h>
 #include <string.h>
 #include <unistd.h>
diff --git a/drivers/dma/dma_stm32.c b/drivers/dma/dma_stm32.c
index 22dd9816383432..9ac5b4e1ec8fc4 100644
--- a/drivers/dma/dma_stm32.c
+++ b/drivers/dma/dma_stm32.c
@@ -22,8 +22,6 @@
 #include <logging/log.h>
 LOG_MODULE_REGISTER(dma_stm32, CONFIG_DMA_LOG_LEVEL);
 
-#include <drivers/clock_control/stm32_clock_control.h>
-
 static void dma_stm32_dump_stream_irq(struct device *dev, u32_t id)
 {
 	const struct dma_stm32_config *config = dev->config->config_info;
diff --git a/drivers/sensor/si7006/si7006.c b/drivers/sensor/si7006/si7006.c
index e49aa507e5d79d..3003ac64ef1f29 100644
--- a/drivers/sensor/si7006/si7006.c
+++ b/drivers/sensor/si7006/si7006.c
@@ -13,7 +13,6 @@
 #include <sys/__assert.h>
 #include <logging/log.h>
 #include <drivers/i2c.h>
-#include <logging/log.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include "si7006.h"
diff --git a/drivers/usb/device/usb_dc_mcux_ehci.c b/drivers/usb/device/usb_dc_mcux_ehci.c
index c9abb7babcf498..45ddaf15b4513b 100644
--- a/drivers/usb/device/usb_dc_mcux_ehci.c
+++ b/drivers/usb/device/usb_dc_mcux_ehci.c
@@ -7,7 +7,6 @@
 #include <soc.h>
 #include <string.h>
 #include <drivers/usb/usb_dc.h>
-#include <soc.h>
 #include <device.h>
 #include "usb_dc_mcux.h"
 #include "usb_device_ehci.h"
diff --git a/drivers/wifi/eswifi/eswifi_core.c b/drivers/wifi/eswifi/eswifi_core.c
index 12ebe095c19458..394b94ceb966f5 100644
--- a/drivers/wifi/eswifi/eswifi_core.c
+++ b/drivers/wifi/eswifi/eswifi_core.c
@@ -22,7 +22,6 @@ LOG_MODULE_REGISTER(wifi_eswifi_core);
 #include <net/ethernet.h>
 #include <net_private.h>
 #include <net/net_core.h>
-#include <net/net_pkt.h>
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/drivers/wifi/winc1500/wifi_winc1500.c b/drivers/wifi/winc1500/wifi_winc1500.c
index 40f3e7372a2aef..abea3c88dba7e7 100644
--- a/drivers/wifi/winc1500/wifi_winc1500.c
+++ b/drivers/wifi/winc1500/wifi_winc1500.c
@@ -106,9 +106,6 @@ typedef struct {
 	struct sockaddr_in	strRemoteAddr;
 } tstrSocketRecvMsg;
 
-#include <driver/include/m2m_wifi.h>
-#include <socket/include/m2m_socket_host_if.h>
-
 #if defined(CONFIG_WIFI_WINC1500_REGION_NORTH_AMERICA)
 #define WINC1500_REGION		NORTH_AMERICA
 #elif defined(CONFIG_WIFI_WINC1500_REGION_EUROPE)
diff --git a/ext/hal/altera/altera_hal/HAL/inc/sys/alt_sys_wrappers.h b/ext/hal/altera/altera_hal/HAL/inc/sys/alt_sys_wrappers.h
index 4939dff7f030d3..e3d015980ba6a3 100644
--- a/ext/hal/altera/altera_hal/HAL/inc/sys/alt_sys_wrappers.h
+++ b/ext/hal/altera/altera_hal/HAL/inc/sys/alt_sys_wrappers.h
@@ -44,7 +44,6 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/time.h>
-#include <sys/times.h>
 
 extern int     ALT_CLOSE (int __fd);
 extern int     ALT_EXECVE (const char *__path, 
diff --git a/include/drivers/timer/system_timer.h b/include/drivers/timer/system_timer.h
index 9c3c416ee55750..e5cba4f6e623ff 100644
--- a/include/drivers/timer/system_timer.h
+++ b/include/drivers/timer/system_timer.h
@@ -18,7 +18,6 @@
 
 #include <stdbool.h>
 #include <device.h>
-#include <stdbool.h>
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/kernel/compiler_stack_protect.c b/kernel/compiler_stack_protect.c
index 2a0dc37f75e9a0..151e10b90568ab 100644
--- a/kernel/compiler_stack_protect.c
+++ b/kernel/compiler_stack_protect.c
@@ -19,7 +19,6 @@
 #include <toolchain.h> /* compiler specific configurations */
 
 #include <kernel_structs.h>
-#include <toolchain.h>
 #include <linker/sections.h>
 #include <kernel.h>
 #include <app_memory/app_memdomain.h>
diff --git a/soc/arm/xilinx_zynqmp/soc.h b/soc/arm/xilinx_zynqmp/soc.h
index 9a53a709ebb72d..bf6630ae8a6cf5 100644
--- a/soc/arm/xilinx_zynqmp/soc.h
+++ b/soc/arm/xilinx_zynqmp/soc.h
@@ -13,7 +13,6 @@
 #ifndef _ASMLANGUAGE
 
 #include <device.h>
-#include <sys/util.h>
 
 #endif /* !_ASMLANGUAGE */
 
diff --git a/subsys/bluetooth/shell/bt.c b/subsys/bluetooth/shell/bt.c
index e2b927b4d40c1c..26fc8089814f7b 100644
--- a/subsys/bluetooth/shell/bt.c
+++ b/subsys/bluetooth/shell/bt.c
@@ -28,7 +28,6 @@
 #include <bluetooth/conn.h>
 #include <bluetooth/rfcomm.h>
 #include <bluetooth/sdp.h>
-#include <bluetooth/hci.h>
 
 #include <shell/shell.h>
 
diff --git a/subsys/fs/shell.c b/subsys/fs/shell.c
index 012e95acd52bfe..9e667070fc2b37 100644
--- a/subsys/fs/shell.c
+++ b/subsys/fs/shell.c
@@ -10,7 +10,6 @@
 #include <shell/shell.h>
 #include <init.h>
 #include <fs/fs.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
 #include <limits.h>
diff --git a/subsys/net/ip/net_shell.c b/subsys/net/ip/net_shell.c
index bc3a0657112a78..98f2ecdd5b11c0 100644
--- a/subsys/net/ip/net_shell.c
+++ b/subsys/net/ip/net_shell.c
@@ -59,7 +59,6 @@ LOG_MODULE_REGISTER(net_shell, LOG_LEVEL_DBG);
 #endif
 
 #if defined(CONFIG_NET_L2_PPP)
-#include <net/ppp.h>
 #include "ppp/ppp_internal.h"
 #endif
 
diff --git a/subsys/net/l2/canbus/6locan.c b/subsys/net/l2/canbus/6locan.c
index 3f7e12bb0574ea..f3ea9e42c4cb81 100644
--- a/subsys/net/l2/canbus/6locan.c
+++ b/subsys/net/l2/canbus/6locan.c
@@ -19,7 +19,6 @@ LOG_MODULE_REGISTER(net_l2_canbus, CONFIG_NET_L2_CANBUS_LOG_LEVEL);
 #include <sys/byteorder.h>
 #include <net/ethernet.h>
 #include <net/net_ip.h>
-#include <string.h>
 
 #define NET_CAN_WFTMAX 2
 #define NET_CAN_ALLOC_TIMEOUT K_MSEC(100)