Index: ELF/LinkerScript.h
===================================================================
--- ELF/LinkerScript.h
+++ ELF/LinkerScript.h
@@ -18,6 +18,7 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/MapVector.h"
+#include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include <cstddef>
@@ -281,6 +282,9 @@
 
   // A list of symbols referenced by the script.
   std::vector<llvm::StringRef> ReferencedSymbols;
+
+  // Used to implement INSERT AFTER sequence.
+  llvm::SetVector<OutputSection*> InsertAfter;
 };
 
 extern LinkerScript *Script;
Index: ELF/ScriptParser.cpp
===================================================================
--- ELF/ScriptParser.cpp
+++ ELF/ScriptParser.cpp
@@ -457,6 +457,14 @@
     }
     Script->SectionCommands.push_back(Cmd);
   }
+
+  if (!atEOF() && consume("INSERT")) {
+    expect("AFTER");
+    skip();
+    for (BaseCommand *Base : Script->SectionCommands)
+      if (auto *Sec = dyn_cast<OutputSection>(Base))
+        Script->InsertAfter.insert(Sec);
+  }
 }
 
 static int precedence(StringRef Op) {
Index: ELF/Writer.cpp
===================================================================
--- ELF/Writer.cpp
+++ ELF/Writer.cpp
@@ -1070,6 +1070,22 @@
     return;
   }
 
+  // This is used to implement INSERT AFTER .section sequence.
+  // In this case we let our orphans placement algorithm to find
+  // and place sections from sequence. We move them to the end so
+  // them are placed after all other sections.
+  if (!Script->InsertAfter.empty()) {
+    std::stable_partition(Script->SectionCommands.begin(),
+                          Script->SectionCommands.end(), [](BaseCommand *Base) {
+                            if (auto *Sec = dyn_cast<OutputSection>(Base))
+                              return !Script->InsertAfter.count(Sec);
+                            return true;
+                          });
+    // Orphan sections assumed to have no valid section index below.
+    for (OutputSection *Sec : Script->InsertAfter)
+      Sec->SectionIndex = INT_MAX;
+  }
+
   // Orphan sections are sections present in the input files which are
   // not explicitly placed into the output file by the linker script.
   //
Index: test/ELF/linkerscript/insert-after.s
===================================================================
--- test/ELF/linkerscript/insert-after.s
+++ test/ELF/linkerscript/insert-after.s
@@ -0,0 +1,36 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t1.o
+# RUN: echo "SECTIONS {                                         \
+# RUN:   .bar1 : { __start_bar1 = .; *(.foo1) __end_bar1 = .; } \
+# RUN:  } INSERT AFTER .data;                                   \
+# RUN:  SECTIONS {                                              \
+# RUN:   .bar2 : { __start_bar2 = .; *(.foo2) __end_bar2 = .; } \
+# RUN:  } INSERT AFTER .text;" > %t.script
+
+# RUN: ld.lld %t1.o -o %t1 --script %t.script
+# RUN: llvm-objdump -section-headers %t1 | FileCheck %s
+
+# CHECK:      Sections:
+# CHECK-NEXT: Idx Name          Size      Address          Type
+# CHECK-NEXT:   0               00000000 0000000000000000
+# CHECK-NEXT:   1 .text         00000001 0000000000000000 TEXT DATA
+# CHECK-NEXT:   2 .bar2         00000008 0000000000000001 TEXT DATA
+# CHECK-NEXT:   3 .data         00000008 0000000000000009 DATA
+# CHECK-NEXT:   4 .bar1         00000008 0000000000000011 DATA
+# CHECK-NEXT:   5 .comment      00000008 0000000000000000
+# CHECK-NEXT:   6 .symtab       00000090 0000000000000000
+# CHECK-NEXT:   7 .shstrtab     0000003c 0000000000000000
+# CHECK-NEXT:   8 .strtab       00000038 0000000000000000
+
+.global _start
+_start:
+ nop
+
+.section .data,"aw"
+.quad 0
+
+.section .foo1,"aw"
+.quad 1
+
+.section .foo2,"ax"
+.quad 1