diff --git a/scripts/lldbinit.py b/scripts/lldbinit.py
index ff1732ab9157..719a615d14fe 100644
--- a/scripts/lldbinit.py
+++ b/scripts/lldbinit.py
@@ -82,6 +82,8 @@ Example usage:
 
     # The set of "Make" functions in dump.cpp.
     id_types = {
+        "clang_decl": "SemIR::MakeClangDeclId",
+        "clang_decl_signature": "SemIR::MakeClangDeclSignatureId",
         "class": "SemIR::MakeClassId",
         "constant": "SemIR::MakeConstantId",
         "constraint": "SemIR::MakeNamedConstraintId",
diff --git a/toolchain/check/dump.cpp b/toolchain/check/dump.cpp
index 3aae38bee6fc..b79e9a23fbba 100644
--- a/toolchain/check/dump.cpp
+++ b/toolchain/check/dump.cpp
@@ -54,6 +54,18 @@ LLVM_DUMP_METHOD static auto Dump(
   return SemIR::Dump(context.sem_ir(), generated_function_id);
 }
 
+LLVM_DUMP_METHOD static auto Dump(const Context& context,
+                                  SemIR::ClangDeclId clang_decl_id)
+    -> std::string {
+  return SemIR::Dump(context.sem_ir(), clang_decl_id);
+}
+
+LLVM_DUMP_METHOD static auto Dump(
+    const Context& context, SemIR::ClangDeclSignatureId clang_decl_signature_id)
+    -> std::string {
+  return SemIR::Dump(context.sem_ir(), clang_decl_signature_id);
+}
+
 LLVM_DUMP_METHOD static auto Dump(const Context& context,
                                   SemIR::ClassId class_id) -> std::string {
   return SemIR::Dump(context.sem_ir(), class_id);
diff --git a/toolchain/check/testdata/basics/raw_sem_ir/cpp_interop.carbon b/toolchain/check/testdata/basics/raw_sem_ir/cpp_interop.carbon
index 9252cf4d6732..732238a34a4d 100644
--- a/toolchain/check/testdata/basics/raw_sem_ir/cpp_interop.carbon
+++ b/toolchain/check/testdata/basics/raw_sem_ir/cpp_interop.carbon
@@ -55,18 +55,18 @@ fn G(x: Cpp.X) {
 // CHECK:STDOUT:     import_ir_inst5: {ir_id: import_ir(Cpp), clang_source_loc_id: clang_source_loc50000005}
 // CHECK:STDOUT:     import_ir_inst6: {ir_id: import_ir(Cpp), clang_source_loc_id: clang_source_loc50000006}
 // CHECK:STDOUT:   clang_decls:
-// CHECK:STDOUT:     clang_decl_id50000000: {key: {decl: "namespace Carbon {\n}"}, inst_id: inst(Package)}
-// CHECK:STDOUT:     clang_decl_id50000001: {key: {decl: "<translation unit>"}, inst_id: inst50000011}
-// CHECK:STDOUT:     clang_decl_id50000002: {key: {decl: "struct X {}"}, inst_id: inst50000013}
-// CHECK:STDOUT:     clang_decl_id50000003: {key: {decl: "X * _Nonnull p"}, inst_id: inst50000024}
-// CHECK:STDOUT:     clang_decl_id50000004: {key: {decl: "void f(X x = {})", clang_decl_signature_id: clang_decl_signature_id50000000}, inst_id: inst5000002F}
-// CHECK:STDOUT:     clang_decl_id50000005: {key: {decl: "inline void f__carbon_thunk()", clang_decl_signature_id: clang_decl_signature_id50000000}, inst_id: inst50000032}
-// CHECK:STDOUT:     clang_decl_id50000006: {key: {decl: "void f(X x = {})", clang_decl_signature_id: clang_decl_signature_id50000001}, inst_id: inst5000003D}
-// CHECK:STDOUT:     clang_decl_id50000007: {key: {decl: "inline void f__carbon_thunk(X * _Nonnull x)", clang_decl_signature_id: clang_decl_signature_id50000001}, inst_id: inst50000047}
-// CHECK:STDOUT:     clang_decl_id50000008: {key: {decl: "X * _Nonnull global"}, inst_id: inst50000052}
+// CHECK:STDOUT:     clang_decl50000000: {key: {decl: "namespace Carbon {\n}"}, inst_id: inst(Package)}
+// CHECK:STDOUT:     clang_decl50000001: {key: {decl: "<translation unit>"}, inst_id: inst50000011}
+// CHECK:STDOUT:     clang_decl50000002: {key: {decl: "struct X {}"}, inst_id: inst50000013}
+// CHECK:STDOUT:     clang_decl50000003: {key: {decl: "X * _Nonnull p"}, inst_id: inst50000024}
+// CHECK:STDOUT:     clang_decl50000004: {key: {decl: "void f(X x = {})", clang_decl_signature_id: clang_decl_signature50000000}, inst_id: inst5000002F}
+// CHECK:STDOUT:     clang_decl50000005: {key: {decl: "inline void f__carbon_thunk()", clang_decl_signature_id: clang_decl_signature50000000}, inst_id: inst50000032}
+// CHECK:STDOUT:     clang_decl50000006: {key: {decl: "void f(X x = {})", clang_decl_signature_id: clang_decl_signature50000001}, inst_id: inst5000003D}
+// CHECK:STDOUT:     clang_decl50000007: {key: {decl: "inline void f__carbon_thunk(X * _Nonnull x)", clang_decl_signature_id: clang_decl_signature50000001}, inst_id: inst50000047}
+// CHECK:STDOUT:     clang_decl50000008: {key: {decl: "X * _Nonnull global"}, inst_id: inst50000052}
 // CHECK:STDOUT:   clang_decl_signatures:
-// CHECK:STDOUT:     clang_decl_signature_id50000000: {kind: normal, num_params: 0}
-// CHECK:STDOUT:     clang_decl_signature_id50000001: {kind: normal, num_params: 1, modes: [value]}
+// CHECK:STDOUT:     clang_decl_signature50000000: {kind: normal, num_params: 0}
+// CHECK:STDOUT:     clang_decl_signature50000001: {kind: normal, num_params: 1, modes: [value]}
 // CHECK:STDOUT:   name_scopes:
 // CHECK:STDOUT:     name_scope0:     {inst: inst(Package), parent_scope: name_scope<none>, has_error: false, extended_scopes: [], names: {name(Cpp): inst50000011, name0: inst5000001E}}
 // CHECK:STDOUT:     name_scope50000001: {inst: inst50000011, parent_scope: name_scope0, has_error: false, extended_scopes: [], names: {name2: inst50000013, name3: inst5000002C, name4: inst50000054}}
diff --git a/toolchain/sem_ir/BUILD b/toolchain/sem_ir/BUILD
index 56665a8cbdf7..7fa4ad192ec1 100644
--- a/toolchain/sem_ir/BUILD
+++ b/toolchain/sem_ir/BUILD
@@ -354,6 +354,7 @@ cc_library(
         ":typed_insts",
         "//common:ostream",
         "//common:raw_string_ostream",
+        "@llvm-project//clang:ast",
     ],
     # Always link dump methods so they are callable from a debugger
     # even though they are never called.
diff --git a/toolchain/sem_ir/dump.cpp b/toolchain/sem_ir/dump.cpp
index bcbc346431fa..3fd33db915a3 100644
--- a/toolchain/sem_ir/dump.cpp
+++ b/toolchain/sem_ir/dump.cpp
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "clang/AST/DeclBase.h"
 #include "common/raw_string_ostream.h"
 #include "toolchain/sem_ir/ids.h"
 #include "toolchain/sem_ir/inst.h"
@@ -213,6 +214,31 @@ LLVM_DUMP_METHOD auto Dump(const File& file,
   return out.TakeStr();
 }
 
+LLVM_DUMP_METHOD auto Dump(const File& file, ClangDeclId clang_decl_id)
+    -> std::string {
+  RawStringOstream out;
+  out << clang_decl_id;
+  if (clang_decl_id.has_value()) {
+    const auto& clang_decl = file.clang_decls().Get(clang_decl_id);
+    out << ": " << clang_decl << "\ndecl:\n";
+    clang_decl.decl()->dump(out);
+  }
+  return out.TakeStr();
+}
+
+LLVM_DUMP_METHOD auto Dump(const File& file,
+                           ClangDeclSignatureId clang_decl_signature_id)
+    -> std::string {
+  RawStringOstream out;
+  out << clang_decl_signature_id;
+  if (clang_decl_signature_id.has_value()) {
+    const auto& clang_decl_signature =
+        file.clang_decl_signatures().Get(clang_decl_signature_id);
+    out << ": " << clang_decl_signature;
+  }
+  return out.TakeStr();
+}
+
 LLVM_DUMP_METHOD auto Dump(const File& file, ClassId class_id) -> std::string {
   RawStringOstream out;
   out << class_id;
@@ -647,6 +673,13 @@ LLVM_DUMP_METHOD static auto MakeGeneratedFunctionId(int id)
     -> GeneratedFunctionId {
   return GeneratedFunctionId(id);
 }
+LLVM_DUMP_METHOD static auto MakeClangDeclId(int id) -> ClangDeclId {
+  return ClangDeclId(id);
+}
+LLVM_DUMP_METHOD static auto MakeClangDeclSignatureId(int id)
+    -> ClangDeclSignatureId {
+  return ClangDeclSignatureId(id);
+}
 LLVM_DUMP_METHOD static auto MakeClassId(int id) -> ClassId {
   return ClassId(id);
 }
diff --git a/toolchain/sem_ir/dump.h b/toolchain/sem_ir/dump.h
index 77f7f3a69dbc..a97015cb6040 100644
--- a/toolchain/sem_ir/dump.h
+++ b/toolchain/sem_ir/dump.h
@@ -33,6 +33,9 @@ auto Dump(const File& file) -> std::string;
 auto Dump(const File& file, RawBundleId bundle_id) -> std::string;
 auto Dump(const File& file, GeneratedFunctionId generated_function_id)
     -> std::string;
+auto Dump(const File& file, ClangDeclId clang_decl_id) -> std::string;
+auto Dump(const File& file, ClangDeclSignatureId clang_decl_signature_id)
+    -> std::string;
 auto Dump(const File& file, ClassId class_id) -> std::string;
 auto Dump(const File& file, ConstantId const_id) -> std::string;
 auto Dump(const File& file, CppOverloadSetId overload_set_id) -> std::string;
diff --git a/toolchain/sem_ir/ids.h b/toolchain/sem_ir/ids.h
index 9d319f5e1dcc..a64b3c72e506 100644
--- a/toolchain/sem_ir/ids.h
+++ b/toolchain/sem_ir/ids.h
@@ -500,14 +500,14 @@ inline constexpr ImportIRId ImportIRId::Cpp = ImportIRId(ApiForImpl.index + 1);
 // embedding pointers directly into the storage of SemIR as part of an
 // instruction.
 struct ClangDeclId : public IdBase<ClangDeclId> {
-  static constexpr llvm::StringLiteral Label = "clang_decl_id";
+  static constexpr llvm::StringLiteral Label = "clang_decl";
 
   using IdBase::IdBase;
 };
 
 // The ID of a `ClangDeclSignature`.
 struct ClangDeclSignatureId : public IdBase<ClangDeclSignatureId> {
-  static constexpr llvm::StringLiteral Label = "clang_decl_signature_id";
+  static constexpr llvm::StringLiteral Label = "clang_decl_signature";
 
   using IdBase::IdBase;
 };