diff --git a/.azurepipelines/Ubuntu-GCC.yml b/.azurepipelines/Ubuntu-GCC.yml
index 99fb247187..ff0dfedce6 100644
--- a/.azurepipelines/Ubuntu-GCC.yml
+++ b/.azurepipelines/Ubuntu-GCC.yml
@@ -22,5 +22,5 @@ jobs:
     tool_chain_tag: 'GCC5'
     vm_image: 'ubuntu-24.04'
     container: ${{ variables.default_linux_image }}
-    arch_list: "IA32,X64,ARM,AARCH64,RISCV64,LOONGARCH64"
+    arch_list: "IA32,X64,AARCH64,RISCV64,LOONGARCH64"
     usePythonVersion: ''  # use Python from the container image
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c22fa8dd61..348a8637f2 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -277,7 +277,7 @@ jobs:
         import shutil
         from pathlib import Path
 
-        dirs_to_delete = ['ia32', 'x64', 'arm', 'aarch64']
+        dirs_to_delete = ['ia32', 'x64', 'aarch64']
 
         def delete_dirs(path: Path):
             if path.exists() and path.is_dir():
diff --git a/.pytool/CISettings.py b/.pytool/CISettings.py
index 46f61db284..e3904a62d2 100644
--- a/.pytool/CISettings.py
+++ b/.pytool/CISettings.py
@@ -98,7 +98,6 @@ class Settings(CiBuildSettingsManager, UpdateSettingsManager, SetupSettingsManag
         return (
                 "IA32",
                 "X64",
-                "ARM",
                 "AARCH64",
                 "RISCV64",
                 "LOONGARCH64")
diff --git a/.pytool/Plugin/HostUnitTestCompilerPlugin/HostUnitTestCompilerPlugin.py b/.pytool/Plugin/HostUnitTestCompilerPlugin/HostUnitTestCompilerPlugin.py
index 76e3392ba1..a4e8e2d6d2 100644
--- a/.pytool/Plugin/HostUnitTestCompilerPlugin/HostUnitTestCompilerPlugin.py
+++ b/.pytool/Plugin/HostUnitTestCompilerPlugin/HostUnitTestCompilerPlugin.py
@@ -65,8 +65,6 @@ class HostUnitTestCompilerPlugin(ICiBuildPlugin):
         elif GetHostInfo().arch == 'ARM':
             if GetHostInfo().bit == '64':
                 host.append("AARCH64")
-            elif GetHostInfo().bit == '32':
-                host.append("ARM")
 
         willrun = set(requested) & set(host)
         return (len(willrun), " ".join(willrun))
diff --git a/.pytool/Readme.md b/.pytool/Readme.md
index d147549270..e74e502213 100644
--- a/.pytool/Readme.md
+++ b/.pytool/Readme.md
@@ -9,7 +9,7 @@ on the TianoCore wiki.
 
 ## Basic Status
 
-| Package              | Windows VS2022 (IA32/X64)| Ubuntu GCC (IA32/X64/ARM/AARCH64) | Known Issues |
+| Package              | Windows VS2022 (IA32/X64)| Ubuntu GCC (IA32/X64/AARCH64) | Known Issues |
 | :----                | :-----                   | :----                             | :---         |
 | ArmPkg               |                    | :heavy_check_mark: |
 | ArmPlatformPkg       |                    | :heavy_check_mark: |
@@ -272,7 +272,7 @@ few standard scopes.
 * PatchCheck tests as plugins
 * MacOS/xcode support
 * Clang/LLVM support
-* Visual Studio AARCH64 and ARM support
+* Visual Studio AARCH64 support
 * BaseTools C tools CI/PR and binary release process
 * BaseTools Python tools CI/PR process
 * Extensible private/closed source platform reporting
diff --git a/Maintainers.txt b/Maintainers.txt
index 0541e10886..9a7dc0d2ae 100644
--- a/Maintainers.txt
+++ b/Maintainers.txt
@@ -83,13 +83,10 @@ M: Liming Gao <gaoliming@byosoft.com.cn> [lgao4]
 
 EDK II Architectures:
 ---------------------
-ARM, AARCH64
+AARCH64
 F: MdeModulePkg/*/AArch64/
-F: MdeModulePkg/*/Arm/
 F: MdePkg/*/AArch64/
-F: MdePkg/*/Arm/
 F: UefiCpuPkg/*/AArch64/
-F: UefiCpuPkg/*/Arm/
 M: Leif Lindholm <leif.lindholm@oss.qualcomm.com> [leiflindholm]
 M: Ard Biesheuvel <ardb+tianocore@kernel.org> [ardbiesheuvel]
 M: Sami Mujawar <sami.mujawar@arm.com> [samimujawar]
@@ -451,7 +448,7 @@ F: MdePkg/Include/IndustryStandard/SpiNorFlashJedecSfdp.h
 M: Abner Chang <abner.chang@amd.com> [changab]
 R: Brit Chesley <brit.chesley@amd.com> [BritChesley]
 
-MdePkg: ARM/AARCH64 standard interfaces
+MdePkg: AARCH64 standard interfaces
 F: MdePkg/Include/Library/ArmLib.h
 M: Leif Lindholm <leif.lindholm@oss.qualcomm.com> [leiflindholm]
 M: Ard Biesheuvel <ardb+tianocore@kernel.org> [ardbiesheuvel]
diff --git a/ReadMe.rst b/ReadMe.rst
index ecde5cc2eb..a694bc9a79 100644
--- a/ReadMe.rst
+++ b/ReadMe.rst
@@ -50,7 +50,6 @@ Ubuntu 24.04
  Toolchain                    CONFIG            DEBUG         RELEASE       NOOPT
 ============================= ================= ============= ============= ==============
 ArmVirtPkg_Ubuntu_GCC_        | AARCH64         |avAArch64du| |avAArch64ru| |avAArch64nu|
-|                             | ARM             |avArmdu|     |avArmru|     |avArmnu|
 EmulatorPkg_Ubuntu_GCC_       | IA32            **N/A**       **N/A**       **N/A**
 |                             | X64             |em64du|      |em64ru|      |em64nu|
 |                             | IA32 FULL       **N/A**       **N/A**       **N/A**