diff --git a/llvm/benchmarks/SpecialCaseListBM.cpp b/llvm/benchmarks/SpecialCaseListBM.cpp
index b5d82682199d..7cf21431efec 100644
--- a/llvm/benchmarks/SpecialCaseListBM.cpp
+++ b/llvm/benchmarks/SpecialCaseListBM.cpp
@@ -5,7 +5,6 @@
 #include "llvm/Support/SpecialCaseList.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
-#include <iterator>
 #include <random>
 #include <string>
 #include <utility>
diff --git a/llvm/include/llvm/ADT/SetVector.h b/llvm/include/llvm/ADT/SetVector.h
index c129f3a695b9..0fde14126c79 100644
--- a/llvm/include/llvm/ADT/SetVector.h
+++ b/llvm/include/llvm/ADT/SetVector.h
@@ -28,7 +28,6 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Compiler.h"
 #include <cassert>
-#include <iterator>
 
 namespace llvm {
 
diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
index 98565f423df3..4d5d1fc7dfad 100644
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -58,7 +58,6 @@
 #include <cassert>
 #include <climits>
 #include <cstdint>
-#include <iterator>
 #include <map>
 #include <string>
 #include <utility>
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h b/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
index fc01afc6d873..01e9cf914cb5 100644
--- a/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
@@ -43,7 +43,6 @@
 #include <algorithm>
 #include <cassert>
 #include <functional>
-#include <iterator>
 #include <memory>
 #include <utility>
 
diff --git a/llvm/include/llvm/IR/DiagnosticInfo.h b/llvm/include/llvm/IR/DiagnosticInfo.h
index 1c86d181e437..8f6fb4da0c83 100644
--- a/llvm/include/llvm/IR/DiagnosticInfo.h
+++ b/llvm/include/llvm/IR/DiagnosticInfo.h
@@ -28,7 +28,6 @@
 #include "llvm/Support/TypeSize.h"
 #include <cstdint>
 #include <functional>
-#include <iterator>
 #include <optional>
 #include <string>
 #include <utility>
diff --git a/llvm/include/llvm/IR/PassManager.h b/llvm/include/llvm/IR/PassManager.h
index acb17a8090c5..4354551a2405 100644
--- a/llvm/include/llvm/IR/PassManager.h
+++ b/llvm/include/llvm/IR/PassManager.h
@@ -47,7 +47,6 @@
 #include "llvm/Support/TypeName.h"
 #include <cassert>
 #include <cstring>
-#include <iterator>
 #include <list>
 #include <memory>
 #include <tuple>
diff --git a/llvm/include/llvm/ProfileData/HashKeyMap.h b/llvm/include/llvm/ProfileData/HashKeyMap.h
index b2f1bf222157..fceb95143340 100644
--- a/llvm/include/llvm/ProfileData/HashKeyMap.h
+++ b/llvm/include/llvm/ProfileData/HashKeyMap.h
@@ -16,7 +16,6 @@
 #define LLVM_PROFILEDATA_HASHKEYMAP_H
 
 #include "llvm/ADT/Hashing.h"
-#include <iterator>
 #include <utility>
 
 namespace llvm {
diff --git a/llvm/include/llvm/Support/CFGDiff.h b/llvm/include/llvm/Support/CFGDiff.h
index 41004d755a12..88f4fe52d201 100644
--- a/llvm/include/llvm/Support/CFGDiff.h
+++ b/llvm/include/llvm/Support/CFGDiff.h
@@ -21,7 +21,6 @@
 #include "llvm/Support/type_traits.h"
 #include <cassert>
 #include <cstddef>
-#include <iterator>
 
 // Two booleans are used to define orders in graphs:
 // InverseGraph defines when we need to reverse the whole graph and is as such
diff --git a/llvm/include/llvm/Support/GenericDomTree.h b/llvm/include/llvm/Support/GenericDomTree.h
index af542bae9f8c..b6aae9f7928e 100644
--- a/llvm/include/llvm/Support/GenericDomTree.h
+++ b/llvm/include/llvm/Support/GenericDomTree.h
@@ -35,7 +35,6 @@
 #include <algorithm>
 #include <cassert>
 #include <cstddef>
-#include <iterator>
 #include <memory>
 #include <type_traits>
 #include <utility>
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h b/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
index 700e0ec5813e..c4929aed1c19 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
@@ -19,7 +19,6 @@
 #include "llvm/IR/DebugInfoMetadata.h"
 #include <cassert>
 #include <cstdint>
-#include <iterator>
 #include <optional>
 
 namespace llvm {
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 814b4b57a0b9..01216552ed26 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -59,7 +59,6 @@
 #include <cassert>
 #include <cstdint>
 #include <cstring>
-#include <iterator>
 #include <string>
 #include <tuple>
 #include <utility>
diff --git a/llvm/lib/DWARFCFIChecker/Registers.h b/llvm/lib/DWARFCFIChecker/Registers.h
index a372c4c4345b..915250de5aea 100644
--- a/llvm/lib/DWARFCFIChecker/Registers.h
+++ b/llvm/lib/DWARFCFIChecker/Registers.h
@@ -17,7 +17,6 @@
 
 #include "llvm/MC/MCRegister.h"
 #include "llvm/MC/MCRegisterInfo.h"
-#include <iterator>
 
 namespace llvm {
 
diff --git a/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp b/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp
index 66c770d9ca86..afc20bed2591 100644
--- a/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp
+++ b/llvm/tools/llvm-exegesis/lib/MCInstrDescView.cpp
@@ -8,7 +8,6 @@
 
 #include "MCInstrDescView.h"
 
-#include <iterator>
 #include <tuple>
 
 #include "llvm/ADT/STLExtras.h"
diff --git a/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp b/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp
index 7ebca23ba795..d692de75cfb8 100644
--- a/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp
+++ b/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp
@@ -14,7 +14,6 @@
 #include "llvm/ADT/Statistic.h"
 #include <algorithm>
 #include <cstdint>
-#include <iterator>
 #include <queue>
 #include <sys/types.h>
 
diff --git a/llvm/unittests/ADT/CombinationGeneratorTest.cpp b/llvm/unittests/ADT/CombinationGeneratorTest.cpp
index 219e18bc5e12..cf187e68479c 100644
--- a/llvm/unittests/ADT/CombinationGeneratorTest.cpp
+++ b/llvm/unittests/ADT/CombinationGeneratorTest.cpp
@@ -13,7 +13,6 @@
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include <cstddef>
-#include <iterator>
 #include <vector>
 
 using namespace llvm;
diff --git a/llvm/utils/TableGen/Common/CodeGenTarget.cpp b/llvm/utils/TableGen/Common/CodeGenTarget.cpp
index 1e9378845854..c0daac127f71 100644
--- a/llvm/utils/TableGen/Common/CodeGenTarget.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenTarget.cpp
@@ -23,7 +23,6 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/TableGen/Error.h"
 #include "llvm/TableGen/Record.h"
-#include <iterator>
 #include <tuple>
 using namespace llvm;