diff --git a/llvm/docs/CommandGuide/llvm-objdump.rst b/llvm/docs/CommandGuide/llvm-objdump.rst
--- a/llvm/docs/CommandGuide/llvm-objdump.rst
+++ b/llvm/docs/CommandGuide/llvm-objdump.rst
@@ -125,6 +125,11 @@
   Specify the target architecture when disassembling. Use :option:`--version`
   for a list of available targets.
 
+.. option:: --build-id=<string>
+
+  Look up the object using the given build ID, specified as a hexadecimal
+  string. The found object is handled as if it were an input filename.
+
 .. option:: -C, --demangle
 
   Demangle symbol names in the output.
diff --git a/llvm/test/tools/llvm-objdump/debuginfod.test b/llvm/test/tools/llvm-objdump/debuginfod.test
--- a/llvm/test/tools/llvm-objdump/debuginfod.test
+++ b/llvm/test/tools/llvm-objdump/debuginfod.test
@@ -30,6 +30,23 @@
 RUN:   %t/stripped | \
 RUN:   FileCheck %s --check-prefix=FOUND
 
+# Use debuginfod to look up build IDs.
+RUN: env DEBUGINFOD_CACHE_PATH=%t llvm-objdump -d --source \
+RUN:   --build-id 1512f769114c011387393822af15dd660c080295 | \
+RUN:   FileCheck %s --check-prefix=FOUND
+
+# Produce an error if malformed.
+RUN: not env DEBUGINFOD_CACHE_PATH=%t llvm-objdump -d --source \
+RUN:   --build-id foo 2> %t.err
+RUN:   FileCheck %s --check-prefix=MALFORMEDERROR --input-file %t.err
+MALFORMEDERROR: error: --build-id: expected a build ID, but got 'foo'
+
+# Produce an error if not found.
+RUN: not env DEBUGINFOD_CACHE_PATH=%t llvm-objdump -d --source \
+RUN:   --build-id abc 2> %t.err
+RUN:   FileCheck %s --check-prefix=NOTFOUNDERROR --input-file %t.err
+NOTFOUNDERROR: error: --build-id: could not find build ID 'abc'
+
 # Use debuginfod to replace very-stripped binaries entirely.
 RUN: llvm-strip --strip-sections %t/stripped
 RUN: env DEBUGINFOD_CACHE_PATH=%t llvm-objdump -d --debuginfod \
diff --git a/llvm/tools/llvm-objdump/ObjdumpOpts.td b/llvm/tools/llvm-objdump/ObjdumpOpts.td
--- a/llvm/tools/llvm-objdump/ObjdumpOpts.td
+++ b/llvm/tools/llvm-objdump/ObjdumpOpts.td
@@ -38,6 +38,10 @@
 def archive_headers : Flag<["--"], "archive-headers">,
   HelpText<"Display archive header information">;
 
+defm build_id :
+  Eq<"build-id", "Build ID to look up. Once found, added as an input file">,
+  MetaVarName<"<dir>">;
+
 def : Flag<["-"], "a">, Alias<archive_headers>,
   HelpText<"Alias for --archive-headers">;
 
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -2790,6 +2790,17 @@
   }
 }
 
+static object::BuildID parseBuildIDArg(const opt::Arg *A) {
+  StringRef V(A->getValue());
+  std::string Bytes;
+  if (!tryGetFromHex(V, Bytes))
+    reportCmdLineError(A->getSpelling() + ": expected a build ID, but got '" +
+                       V + "'");
+  ArrayRef<uint8_t> BuildID(reinterpret_cast<const uint8_t *>(Bytes.data()),
+                            Bytes.size());
+  return object::BuildID(BuildID.begin(), BuildID.end());
+}
+
 static void invalidArgValue(const opt::Arg *A) {
   reportCmdLineError("'" + StringRef(A->getValue()) +
                      "' is not a valid value for '" + A->getSpelling() + "'");
@@ -2956,6 +2967,17 @@
     llvm::cl::ParseCommandLineOptions(2, Argv);
   }
 
+  // Look up any provided build IDs, then append them to the input filenames.
+  for (const opt::Arg *A : InputArgs.filtered(OBJDUMP_build_id)) {
+    object::BuildID BuildID = parseBuildIDArg(A);
+    Optional<std::string> Path = BIDFetcher->fetch(BuildID);
+    if (!Path) {
+      reportCmdLineError(A->getSpelling() + ": could not find build ID '" +
+                         A->getValue() + "'");
+    }
+    InputFilenames.push_back(std::move(*Path));
+  }
+
   // objdump defaults to a.out if no filenames specified.
   if (InputFilenames.empty())
     InputFilenames.push_back("a.out");
@@ -3023,15 +3045,11 @@
     return 0;
   }
 
-  if (Is("otool"))
-    parseOtoolOptions(InputArgs);
-  else
-    parseObjdumpOptions(InputArgs);
-
   // Initialize debuginfod.
   const bool ShouldUseDebuginfodByDefault =
-      HTTPClient::isAvailable() &&
-      !ExitOnErr(getDefaultDebuginfodUrls()).empty();
+      InputArgs.hasArg(OBJDUMP_build_id) ||
+      (HTTPClient::isAvailable() &&
+       !ExitOnErr(getDefaultDebuginfodUrls()).empty());
   if (InputArgs.hasFlag(OBJDUMP_debuginfod, OBJDUMP_no_debuginfod,
                         ShouldUseDebuginfodByDefault)) {
     HTTPClient::initialize();
@@ -3040,6 +3058,11 @@
     BIDFetcher = std::make_unique<BuildIDFetcher>(DebugFileDirectories);
   }
 
+  if (Is("otool"))
+    parseOtoolOptions(InputArgs);
+  else
+    parseObjdumpOptions(InputArgs);
+
   if (StartAddress >= StopAddress)
     reportCmdLineError("start address should be less than stop address");