diff --git a/lld/COFF/Config.h b/lld/COFF/Config.h
--- a/lld/COFF/Config.h
+++ b/lld/COFF/Config.h
@@ -170,8 +170,6 @@
   // Used for /opt:lldltocachepolicy=policy
   llvm::CachePruningPolicy ltoCachePolicy;
 
-  // Used for /opt:[no]ltonewpassmanager
-  bool ltoNewPassManager = false;
   // Used for /opt:[no]ltodebugpassmanager
   bool ltoDebugPassManager = false;
 
diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -1679,7 +1679,6 @@
   if (args.hasArg(OPT_profile))
     icfLevel = ICFLevel::None;
   unsigned tailMerge = 1;
-  bool ltoNewPM = true;
   bool ltoDebugPM = false;
   for (auto *arg : args.filtered(OPT_opt)) {
     std::string str = StringRef(arg->getValue()).lower();
@@ -1701,9 +1700,7 @@
       } else if (s == "nolldtailmerge") {
         tailMerge = 0;
       } else if (s == "ltonewpassmanager") {
-        ltoNewPM = true;
-      } else if (s == "noltonewpassmanager") {
-        ltoNewPM = false;
+        /* We always use the new PM. */
       } else if (s == "ltodebugpassmanager") {
         ltoDebugPM = true;
       } else if (s == "noltodebugpassmanager") {
@@ -1733,7 +1730,6 @@
   config->doICF = icfLevel.getValue();
   config->tailMerge =
       (tailMerge == 1 && config->doICF != ICFLevel::None) || tailMerge == 2;
-  config->ltoNewPassManager = ltoNewPM;
   config->ltoDebugPassManager = ltoDebugPM;
 
   // Handle /lldsavetemps
diff --git a/lld/COFF/LTO.cpp b/lld/COFF/LTO.cpp
--- a/lld/COFF/LTO.cpp
+++ b/lld/COFF/LTO.cpp
@@ -83,7 +83,6 @@
   c.MAttrs = getMAttrs();
   c.CGOptLevel = args::getCGOptLevel(config->ltoo);
   c.AlwaysEmitRegularLTOObj = !config->ltoObjPath.empty();
-  c.UseNewPM = config->ltoNewPassManager;
   c.DebugPassManager = config->ltoDebugPassManager;
   c.CSIRProfile = std::string(config->ltoCSProfileFile);
   c.RunCSIRInstr = config->ltoCSProfileGenerate;
diff --git a/lld/ELF/Config.h b/lld/ELF/Config.h
--- a/lld/ELF/Config.h
+++ b/lld/ELF/Config.h
@@ -187,7 +187,6 @@
   bool ltoPGOWarnMismatch;
   bool ltoDebugPassManager;
   bool ltoEmitAsm;
-  bool ltoNewPassManager;
   bool ltoUniqueBasicBlockSectionNames;
   bool ltoWholeProgramVisibility;
   bool mergeArmExidx;
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -1102,8 +1102,6 @@
                                             OPT_no_lto_pgo_warn_mismatch, true);
   config->ltoDebugPassManager = args.hasArg(OPT_lto_debug_pass_manager);
   config->ltoEmitAsm = args.hasArg(OPT_lto_emit_asm);
-  config->ltoNewPassManager = args.hasFlag(OPT_no_lto_legacy_pass_manager,
-                                           OPT_lto_legacy_pass_manager, true);
   config->ltoNewPmPasses = args.getLastArgValue(OPT_lto_newpm_passes);
   config->ltoWholeProgramVisibility =
       args.hasFlag(OPT_lto_whole_program_visibility,
diff --git a/lld/ELF/LTO.cpp b/lld/ELF/LTO.cpp
--- a/lld/ELF/LTO.cpp
+++ b/lld/ELF/LTO.cpp
@@ -146,7 +146,6 @@
   c.StatsFile = std::string(config->optStatsFilename);
 
   c.SampleProfile = std::string(config->ltoSampleProfile);
-  c.UseNewPM = config->ltoNewPassManager;
   for (StringRef pluginFn : config->passPlugins)
     c.PassPlugins.push_back(std::string(pluginFn));
   c.DebugPassManager = config->ltoDebugPassManager;
diff --git a/lld/ELF/Options.td b/lld/ELF/Options.td
--- a/lld/ELF/Options.td
+++ b/lld/ELF/Options.td
@@ -547,9 +547,8 @@
   HelpText<"Debug new pass manager">;
 def lto_emit_asm: FF<"lto-emit-asm">,
   HelpText<"Emit assembly code">;
-defm lto_legacy_pass_manager: BB<"lto-legacy-pass-manager",
-  "Use the legacy pass manager in LLVM",
-  "Use the new pass manager in LLVM">;
+def no_lto_legacy_pass_manager: FF<"no-lto-legacy-pass-manager">,
+  HelpText<"Use the new pass manager in LLVM">;
 def lto_newpm_passes: JJ<"lto-newpm-passes=">,
   HelpText<"Passes to run during LTO">;
 def lto_O: JJ<"lto-O">, MetaVarName<"<opt-level>">,
@@ -622,8 +621,6 @@
 def plugin_opt_mcpu_eq: J<"plugin-opt=mcpu=">;
 def: F<"plugin-opt=new-pass-manager">,
   Alias<no_lto_legacy_pass_manager>, HelpText<"Alias for --no-lto-legacy-pass-manager">;
-def: F<"plugin-opt=legacy-pass-manager">,
-  Alias<lto_legacy_pass_manager>, HelpText<"Alias for --no-legacy-pass-manager">;
 def: F<"plugin-opt=cs-profile-generate">,
   Alias<lto_cs_profile_generate>, HelpText<"Alias for --lto-cs-profile-generate">;
 def: J<"plugin-opt=cs-profile-path=">,
diff --git a/lld/MachO/Config.h b/lld/MachO/Config.h
--- a/lld/MachO/Config.h
+++ b/lld/MachO/Config.h
@@ -107,7 +107,6 @@
   bool implicitDylibs = false;
   bool isPic = false;
   bool headerPadMaxInstallNames = false;
-  bool ltoNewPassManager = true;
   bool markDeadStrippableDylib = false;
   bool printDylibSearch = false;
   bool printEachFile = false;
diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -1222,8 +1222,6 @@
     config->umbrella = arg->getValue();
   }
   config->ltoObjPath = args.getLastArgValue(OPT_object_path_lto);
-  config->ltoNewPassManager = args.hasFlag(OPT_no_lto_legacy_pass_manager,
-                                           OPT_lto_legacy_pass_manager, true);
   config->ltoo = args::getInteger(args, OPT_lto_O, 2);
   if (config->ltoo > 3)
     error("--lto-O: invalid optimization level: " + Twine(config->ltoo));
diff --git a/lld/MachO/LTO.cpp b/lld/MachO/LTO.cpp
--- a/lld/MachO/LTO.cpp
+++ b/lld/MachO/LTO.cpp
@@ -38,7 +38,6 @@
   c.CPU = getCPUStr();
   c.MAttrs = getMAttrs();
   c.DiagHandler = diagnosticHandler;
-  c.UseNewPM = config->ltoNewPassManager;
   c.PreCodeGenPassesHook = [](legacy::PassManager &pm) {
     pm.add(createObjCARCContractPass());
   };
diff --git a/lld/MachO/Options.td b/lld/MachO/Options.td
--- a/lld/MachO/Options.td
+++ b/lld/MachO/Options.td
@@ -40,9 +40,6 @@
 def version: Flag<["--"], "version">,
     HelpText<"Display the version number and exit">,
     Group<grp_lld>;
-def lto_legacy_pass_manager: Flag<["--"], "lto-legacy-pass-manager">,
-    HelpText<"Use the legacy pass manager in LLVM">,
-    Group<grp_lld>;
 def no_lto_legacy_pass_manager : Flag<["--"], "no-lto-legacy-pass-manager">,
     HelpText<"Use the new pass manager in LLVM">,
     Group<grp_lld>;
diff --git a/lld/test/COFF/lto-new-pass-manager.ll b/lld/test/COFF/lto-new-pass-manager.ll
--- a/lld/test/COFF/lto-new-pass-manager.ll
+++ b/lld/test/COFF/lto-new-pass-manager.ll
@@ -4,11 +4,6 @@
 ; RUN: lld-link %t.obj -entry:main -opt:ltonewpassmanager -opt:ltodebugpassmanager 2>&1 | FileCheck %s --check-prefix=ENABLED
 ; ENABLED: Running pass: InstCombinePass
 
-; Passing -time just to avoid empty FileCheck input
-; RUN: lld-link %t.obj -entry:main -time -opt:ltonewpassmanager -opt:ltodebugpassmanager -opt:noltonewpassmanager 2>&1 | FileCheck %s --check-prefix=DISABLED
-; RUN: lld-link %t.obj -entry:main -time -opt:ltonewpassmanager -opt:ltodebugpassmanager -opt:noltodebugpassmanager 2>&1 | FileCheck %s --check-prefix=DISABLED
-; DISABLED-NOT: Running pass: InstCombinePass
-
 target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-pc-windows-msvc19.11.0"
 
diff --git a/lld/test/ELF/lto/new-pass-manager.ll b/lld/test/ELF/lto/new-pass-manager.ll
--- a/lld/test/ELF/lto/new-pass-manager.ll
+++ b/lld/test/ELF/lto/new-pass-manager.ll
@@ -6,11 +6,8 @@
 ; RUN: ld.lld --plugin-opt=new-pass-manager --lto-debug-pass-manager -o /dev/null %t.o 2>&1 | FileCheck %s
 ; RUN: ld.lld --no-lto-legacy-pass-manager --plugin-opt=debug-pass-manager -o /dev/null %t.o 2>&1 | FileCheck %s
 ; RUN: ld.lld --no-lto-legacy-pass-manager --lto-debug-pass-manager -o /dev/null %t.o 2>&1 | FileCheck %s
-; RUN: ld.lld --no-lto-legacy-pass-manager --lto-legacy-pass-manager --lto-debug-pass-manager -o /dev/null %t.o 2>&1 | FileCheck %s --check-prefix=LEGACY
-; RUN: ld.lld --plugin-opt=legacy-pass-manager --plugin-opt=debug-pass-manager -o /dev/null %t.o 2>&1 | FileCheck %s --check-prefix=LEGACY
 
 ; CHECK: Running pass: GlobalOptPass
-; LEGACY-NOT: Running pass: GlobalOptPass
 
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
diff --git a/lld/test/ELF/lto/verify-invalid.ll b/lld/test/ELF/lto/verify-invalid.ll
--- a/lld/test/ELF/lto/verify-invalid.ll
+++ b/lld/test/ELF/lto/verify-invalid.ll
@@ -1,11 +1,5 @@
 ; REQUIRES: x86
 ; RUN: llvm-as %s -o %t.o
-; RUN: ld.lld %t.o -o %t2 -mllvm -debug-pass=Arguments --lto-legacy-pass-manager \
-; RUN:   2>&1 | FileCheck -check-prefix=DEFAULT-LPM %s
-; RUN: ld.lld %t.o -o %t2 -mllvm -debug-pass=Arguments --lto-legacy-pass-manager \
-; RUN:   -disable-verify 2>&1 | FileCheck -check-prefix=DISABLE-LPM %s
-; RUN: ld.lld %t.o -o %t2 -mllvm -debug-pass=Arguments --lto-legacy-pass-manager \
-; RUN:   --plugin-opt=disable-verify 2>&1 | FileCheck -check-prefix=DISABLE-LPM %s
 ; RUN: ld.lld %t.o -o %t2 --no-lto-legacy-pass-manager --lto-debug-pass-manager \
 ; RUN:   2>&1 | FileCheck -check-prefix=DEFAULT-NPM %s
 ; RUN: ld.lld %t.o -o %t2 --no-lto-legacy-pass-manager --lto-debug-pass-manager \
@@ -21,8 +15,6 @@
 }
 
 ; -disable-verify should disable the verification of bitcode.
-; DEFAULT-LPM:     Pass Arguments: {{.*}} -verify {{.*}} -verify
-; DISABLE-LPM-NOT: Pass Arguments: {{.*}} -verify {{.*}} -verify
 ; DEFAULT-NPM: Running pass: VerifierPass
 ; DEFAULT-NPM: Running pass: VerifierPass
 ; DEFAULT-NPM-NOT: Running pass: VerifierPass
diff --git a/lld/test/MachO/lto-objc-arc-contract.ll b/lld/test/MachO/lto-objc-arc-contract.ll
--- a/lld/test/MachO/lto-objc-arc-contract.ll
+++ b/lld/test/MachO/lto-objc-arc-contract.ll
@@ -5,14 +5,10 @@
 ;; which doesn't know how to handle it.
 
 ; RUN: llvm-as %s -o %t.o
-; RUN: %lld -dylib -lSystem %t.o -o %t --lto-legacy-pass-manager
-; RUN: llvm-objdump -d %t | FileCheck %s
 ; RUN: %lld -dylib -lSystem %t.o -o %t --no-lto-legacy-pass-manager
 ; RUN: llvm-objdump -d %t | FileCheck %s
 
 ; RUN: opt -module-summary %s -o %t.o
-; RUN: %lld -dylib -lSystem %t.o -o %t --lto-legacy-pass-manager
-; RUN: llvm-objdump -d %t | FileCheck %s
 ; RUN: %lld -dylib -lSystem %t.o -o %t --no-lto-legacy-pass-manager
 ; RUN: llvm-objdump -d %t | FileCheck %s
 
diff --git a/lld/test/wasm/lto/new-pass-manager.ll b/lld/test/wasm/lto/new-pass-manager.ll
--- a/lld/test/wasm/lto/new-pass-manager.ll
+++ b/lld/test/wasm/lto/new-pass-manager.ll
@@ -1,9 +1,7 @@
 ; RUN: llvm-as -o %t.bc %s
 ; RUN: wasm-ld --no-lto-legacy-pass-manager --lto-debug-pass-manager -o /dev/null %t.bc 2>&1 | FileCheck %s
-; RUN: wasm-ld --no-lto-legacy-pass-manager --lto-debug-pass-manager --lto-legacy-pass-manager -o /dev/null %t.bc 2>&1 | FileCheck %s --allow-empty --check-prefix=LPM
 
 ; CHECK: Running pass: GlobalOptPass
-; LPM-NOT: Running pass: GlobalOptPass
 
 target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128"
 target triple = "wasm32-unknown-unknown"
diff --git a/lld/test/wasm/lto/verify-invalid.ll b/lld/test/wasm/lto/verify-invalid.ll
--- a/lld/test/wasm/lto/verify-invalid.ll
+++ b/lld/test/wasm/lto/verify-invalid.ll
@@ -1,8 +1,4 @@
 ; RUN: llvm-as %s -o %t.o
-; RUN: wasm-ld %t.o -o %t2 --lto-legacy-pass-manager -mllvm -debug-pass=Arguments \
-; RUN:   2>&1 | FileCheck -check-prefix=DEFAULT-LPM %s
-; RUN: wasm-ld %t.o -o %t2 --lto-legacy-pass-manager -mllvm -debug-pass=Arguments \
-; RUN:   -disable-verify 2>&1 | FileCheck -check-prefix=DISABLE-LPM %s
 ; RUN: wasm-ld %t.o -o %t2 --no-lto-legacy-pass-manager --lto-debug-pass-manager \
 ; RUN:   2>&1 | FileCheck -check-prefix=DEFAULT-NPM %s
 ; RUN: wasm-ld %t.o -o %t2 --no-lto-legacy-pass-manager --lto-debug-pass-manager \
@@ -16,8 +12,6 @@
 }
 
 ; -disable-verify should disable the verification of bitcode.
-; DEFAULT-LPM:     Pass Arguments: {{.*}} -verify {{.*}} -verify
-; DISABLE-LPM-NOT: Pass Arguments: {{.*}} -verify {{.*}} -verify
 ; DEFAULT-NPM: Running pass: VerifierPass
 ; DEFAULT-NPM: Running pass: VerifierPass
 ; DEFAULT-NPM-NOT: Running pass: VerifierPass
diff --git a/lld/wasm/Config.h b/lld/wasm/Config.h
--- a/lld/wasm/Config.h
+++ b/lld/wasm/Config.h
@@ -61,7 +61,6 @@
   unsigned ltoo;
   unsigned optimize;
   llvm::StringRef thinLTOJobs;
-  bool ltoNewPassManager;
   bool ltoDebugPassManager;
   UnresolvedPolicy unresolvedSymbols;
 
diff --git a/lld/wasm/Driver.cpp b/lld/wasm/Driver.cpp
--- a/lld/wasm/Driver.cpp
+++ b/lld/wasm/Driver.cpp
@@ -365,8 +365,6 @@
   config->importUndefined = args.hasArg(OPT_import_undefined);
   config->ltoo = args::getInteger(args, OPT_lto_O, 2);
   config->ltoPartitions = args::getInteger(args, OPT_lto_partitions, 1);
-  config->ltoNewPassManager = args.hasFlag(OPT_no_lto_legacy_pass_manager,
-                                           OPT_lto_legacy_pass_manager, true);
   config->ltoDebugPassManager = args.hasArg(OPT_lto_debug_pass_manager);
   config->mapFile = args.getLastArgValue(OPT_Map);
   config->optimize = args::getInteger(args, OPT_O, 1);
diff --git a/lld/wasm/LTO.cpp b/lld/wasm/LTO.cpp
--- a/lld/wasm/LTO.cpp
+++ b/lld/wasm/LTO.cpp
@@ -52,7 +52,6 @@
   c.OptLevel = config->ltoo;
   c.MAttrs = getMAttrs();
   c.CGOptLevel = args::getCGOptLevel(config->ltoo);
-  c.UseNewPM = config->ltoNewPassManager;
   c.DebugPassManager = config->ltoDebugPassManager;
 
   if (config->relocatable)
diff --git a/lld/wasm/Options.td b/lld/wasm/Options.td
--- a/lld/wasm/Options.td
+++ b/lld/wasm/Options.td
@@ -228,7 +228,8 @@
 defm thinlto_cache_policy: Eq<"thinlto-cache-policy", "Pruning policy for the ThinLTO cache">;
 def thinlto_jobs: J<"thinlto-jobs=">,
   HelpText<"Number of ThinLTO jobs. Default to --threads=">;
-defm lto_legacy_pass_manager: BB<"lto-legacy-pass-manager", "Use legacy pass manager", "Use new pass manager">;
+def no_lto_legacy_pass_manager: F<"no-lto-legacy-pass-manager">,
+  HelpText<"Use new pass manager">;
 def lto_debug_pass_manager: F<"lto-debug-pass-manager">,
   HelpText<"Debug new pass manager">;