diff --git a/src/posix/platform/hdlc_interface.cpp b/src/posix/platform/hdlc_interface.cpp
index e97197f50..9b185db06 100644
--- a/src/posix/platform/hdlc_interface.cpp
+++ b/src/posix/platform/hdlc_interface.cpp
@@ -121,7 +121,7 @@
 #if OPENTHREAD_POSIX_CONFIG_RCP_UART_ENABLE
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 HdlcInterface::HdlcInterface(SpinelInterface::Callbacks &aCallback, SpinelInterface::RxFrameBuffer &aFrameBuffer)
     : mCallbacks(aCallback)
@@ -635,6 +635,6 @@ void HdlcInterface::HandleHdlcFrame(otError aError)
     }
 }
 
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 #endif // OPENTHREAD_POSIX_CONFIG_RCP_UART_ENABLE
diff --git a/src/posix/platform/hdlc_interface.hpp b/src/posix/platform/hdlc_interface.hpp
index dd4ec8236..621ad26c8 100644
--- a/src/posix/platform/hdlc_interface.hpp
+++ b/src/posix/platform/hdlc_interface.hpp
@@ -42,7 +42,7 @@
 #if OPENTHREAD_POSIX_CONFIG_RCP_UART_ENABLE
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 /**
  * This class defines an HDLC interface to the Radio Co-processor (RCP)
@@ -215,7 +215,7 @@ private:
     Hdlc::Decoder mHdlcDecoder;
 };
 
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 
 #endif // OPENTHREAD_POSIX_CONFIG_RCP_UART_ENABLE
diff --git a/src/posix/platform/radio_spinel.cpp b/src/posix/platform/radio_spinel.cpp
index 63ce01e64..08e41ce55 100644
--- a/src/posix/platform/radio_spinel.cpp
+++ b/src/posix/platform/radio_spinel.cpp
@@ -68,10 +68,10 @@
 
 using ot::Spinel::Decoder;
 
-static ot::PosixApp::RadioSpinel sRadioSpinel;
+static ot::Posix::RadioSpinel sRadioSpinel;
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 static otError SpinelStatusToOtError(spinel_status_t aError)
 {
@@ -245,7 +245,7 @@ otError RadioSpinel::CheckSpinelVersion(void)
     if ((versionMajor != SPINEL_PROTOCOL_VERSION_THREAD_MAJOR) ||
         (versionMinor != SPINEL_PROTOCOL_VERSION_THREAD_MINOR))
     {
-        otLogCritPlat("Spinel version mismatch - PosixApp:%d.%d, RCP:%d.%d", SPINEL_PROTOCOL_VERSION_THREAD_MAJOR,
+        otLogCritPlat("Spinel version mismatch - Posix:%d.%d, RCP:%d.%d", SPINEL_PROTOCOL_VERSION_THREAD_MAJOR,
                       SPINEL_PROTOCOL_VERSION_THREAD_MINOR, versionMajor, versionMinor);
         DieNow(OT_EXIT_RADIO_SPINEL_INCOMPATIBLE);
     }
@@ -1600,7 +1600,7 @@ otRadioState RadioSpinel::GetState(void) const
     return sOtRadioStateMap[mState];
 }
 
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 
 void otPlatRadioGetIeeeEui64(otInstance *aInstance, uint8_t *aIeeeEui64)
@@ -1849,7 +1849,7 @@ exit:
 #endif
 
 #if OPENTHREAD_POSIX_VIRTUAL_TIME
-void ot::PosixApp::RadioSpinel::Process(const Event &aEvent)
+void ot::Posix::RadioSpinel::Process(const Event &aEvent)
 {
     if (mRxFrameBuffer.HasSavedFrame())
     {
diff --git a/src/posix/platform/radio_spinel.hpp b/src/posix/platform/radio_spinel.hpp
index 64e11f6f7..e754d7b37 100644
--- a/src/posix/platform/radio_spinel.hpp
+++ b/src/posix/platform/radio_spinel.hpp
@@ -55,7 +55,7 @@
 #include "ncp/ncp_config.h"
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 class RadioSpinel : public SpinelInterface::Callbacks
 {
@@ -729,7 +729,7 @@ private:
     uint64_t mTxRadioEndUs;
 };
 
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 
 #endif // RADIO_SPINEL_HPP_
diff --git a/src/posix/platform/spi_interface.cpp b/src/posix/platform/spi_interface.cpp
index b3e8b66df..96172266d 100644
--- a/src/posix/platform/spi_interface.cpp
+++ b/src/posix/platform/spi_interface.cpp
@@ -60,7 +60,7 @@
 #include <linux/spi/spidev.h>
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 SpiInterface::SpiInterface(SpinelInterface::Callbacks &aCallback, SpinelInterface::RxFrameBuffer &aFrameBuffer)
     : mCallbacks(aCallback)
@@ -782,7 +782,7 @@ void SpiInterface::LogStats(void)
     otLogInfoPlat("INFO: mSpiTxFrameCount=%" PRIu64, mSpiTxFrameCount);
     otLogInfoPlat("INFO: mSpiTxFrameByteCount=%" PRIu64, mSpiTxFrameByteCount);
 }
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 
 #endif // OPENTHREAD_POSIX_CONFIG_RCP_SPI_ENABLE
diff --git a/src/posix/platform/spi_interface.hpp b/src/posix/platform/spi_interface.hpp
index 3e4891c4a..05649dc09 100644
--- a/src/posix/platform/spi_interface.hpp
+++ b/src/posix/platform/spi_interface.hpp
@@ -46,7 +46,7 @@
 #include "ncp/ncp_spi.hpp"
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 /**
  * This class defines an SPI interface to the Radio Co-processor (RCP).
@@ -220,7 +220,7 @@ private:
     uint16_t mSpiSlaveDataLen;
 };
 
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 
 #endif // OPENTHREAD_POSIX_CONFIG_RCP_SPI_ENABLE
diff --git a/src/posix/platform/spinel_interface.hpp b/src/posix/platform/spinel_interface.hpp
index adce2f975..5e203139a 100644
--- a/src/posix/platform/spinel_interface.hpp
+++ b/src/posix/platform/spinel_interface.hpp
@@ -40,7 +40,7 @@
 #include "lib/hdlc/hdlc.hpp"
 
 namespace ot {
-namespace PosixApp {
+namespace Posix {
 
 class SpinelInterface
 {
@@ -78,7 +78,7 @@ public:
         void HandleReceivedFrame(void);
     };
 };
-} // namespace PosixApp
+} // namespace Posix
 } // namespace ot
 
 #endif // POSIX_APP_SPINEL_INTERFACE_HPP_