diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -489,6 +489,7 @@
     case OPT_Z:
     case OPT_arch:
     case OPT_syslibroot:
+    case OPT_sectcreate:
       // handled elsewhere
       break;
     default:
@@ -518,6 +519,15 @@
   createSyntheticSections();
   symtab->addDSOHandle(in.header);
 
+  for (opt::Arg *arg : args.filtered(OPT_sectcreate)) {
+    StringRef segName = arg->getValue(0);
+    StringRef sectName = arg->getValue(1);
+    StringRef fileName = arg->getValue(2);
+    Optional<MemoryBufferRef> buffer = readFile(fileName);
+    if (buffer)
+      inputFiles.push_back(make<OpaqueFile>(*buffer, segName, sectName));
+  }
+
   // Initialize InputSections.
   for (InputFile *file : inputFiles) {
     for (SubsectionMap &map : file->subsections) {
diff --git a/lld/MachO/InputFiles.h b/lld/MachO/InputFiles.h
--- a/lld/MachO/InputFiles.h
+++ b/lld/MachO/InputFiles.h
@@ -40,6 +40,7 @@
     ObjKind,
     DylibKind,
     ArchiveKind,
+    OpaqueKind,
   };
 
   virtual ~InputFile() = default;
@@ -72,6 +73,14 @@
   static bool classof(const InputFile *f) { return f->kind() == ObjKind; }
 };
 
+// command-line -sectcreate file
+class OpaqueFile : public InputFile {
+public:
+  explicit OpaqueFile(MemoryBufferRef mb, StringRef segName,
+                      StringRef sectName);
+  static bool classof(const InputFile *f) { return f->kind() == OpaqueKind; }
+};
+
 // .dylib file
 class DylibFile : public InputFile {
 public:
diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
--- a/lld/MachO/InputFiles.cpp
+++ b/lld/MachO/InputFiles.cpp
@@ -301,6 +301,18 @@
   }
 }
 
+OpaqueFile::OpaqueFile(MemoryBufferRef mb, StringRef segName,
+                       StringRef sectName)
+    : InputFile(OpaqueKind, mb) {
+  InputSection *isec = make<InputSection>();
+  isec->file = this;
+  isec->name = sectName.take_front(16);
+  isec->segname = segName.take_front(16);
+  auto *buf = reinterpret_cast<const uint8_t *>(mb.getBufferStart());
+  isec->data = {buf, mb.getBufferSize()};
+  inputSections.push_back(isec);
+}
+
 ObjFile::ObjFile(MemoryBufferRef mb) : InputFile(ObjKind, mb) {
   auto *buf = reinterpret_cast<const uint8_t *>(mb.getBufferStart());
   auto *hdr = reinterpret_cast<const mach_header_64 *>(mb.getBufferStart());
diff --git a/lld/MachO/Options.td b/lld/MachO/Options.td
--- a/lld/MachO/Options.td
+++ b/lld/MachO/Options.td
@@ -156,7 +156,6 @@
 def sectcreate : MultiArg<["-"], "sectcreate", 3>,
      MetaVarName<"<segment> <section> <file>">,
      HelpText<"Create <section> in <segment> from the contents of <file>">,
-     Flags<[HelpHidden]>,
      Group<grp_content>;
 def segcreate : MultiArg<["-"], "segcreate", 3>,
      MetaVarName<"<segment> <section> <file>">,
diff --git a/lld/test/MachO/sectcreate.s b/lld/test/MachO/sectcreate.s
new file mode 100644
--- /dev/null
+++ b/lld/test/MachO/sectcreate.s
@@ -0,0 +1,15 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
+# RUN: echo "Contents of -sectcreate option" >%t2
+# RUN: lld -flavor darwinnew -Z -o %t %t.o -sectcreate FOO BARF %t2
+# RUN: llvm-objdump -s %t | FileCheck %s
+
+# CHECK: Contents of section BARF:
+# CHECK: 100001000 436f6e74 656e7473 206f6620 2d736563  Contents of -sec
+# CHECK: 100001010 74637265 61746520 6f707469 6f6e0a    tcreate option.
+
+.text
+.global _main
+_main:
+  mov $0, %eax
+  ret