diff --git a/mlir/include/mlir/IR/MLIRContext.h b/mlir/include/mlir/IR/MLIRContext.h
--- a/mlir/include/mlir/IR/MLIRContext.h
+++ b/mlir/include/mlir/IR/MLIRContext.h
@@ -98,6 +98,14 @@
         }));
   }
 
+  /// Return whether the given dialect is loaded or not.
+  bool isDialectLoaded(StringRef dialectNamespace);
+
+  /// Return whether the given dialect is loaded or not.
+  template <typename T> bool isDialectLoaded() {
+    return isDialectLoaded(T::getDialectNamespace());
+  }
+
   /// Load a dialect in the context.
   template <typename Dialect>
   void loadDialect() {
diff --git a/mlir/lib/IR/MLIRContext.cpp b/mlir/lib/IR/MLIRContext.cpp
--- a/mlir/lib/IR/MLIRContext.cpp
+++ b/mlir/lib/IR/MLIRContext.cpp
@@ -458,6 +458,12 @@
   return dialect.get();
 }
 
+bool MLIRContext::isDialectLoaded(StringRef dialectNamespace) {
+  auto &impl = getImpl();
+  return impl.loadedDialects.find(dialectNamespace) !=
+         impl.loadedDialects.end();
+}
+
 DynamicDialect *MLIRContext::getOrLoadDynamicDialect(
     StringRef dialectNamespace, function_ref<void(DynamicDialect *)> ctor) {
   auto &impl = getImpl();
diff --git a/mlir/tools/mlir-tblgen/DialectGen.cpp b/mlir/tools/mlir-tblgen/DialectGen.cpp
--- a/mlir/tools/mlir-tblgen/DialectGen.cpp
+++ b/mlir/tools/mlir-tblgen/DialectGen.cpp
@@ -258,7 +258,10 @@
 {0}::{0}(::mlir::MLIRContext *context) 
     : ::mlir::{2}(getDialectNamespace(), context, ::mlir::TypeID::get<{0}>()) {{
   {1}
-  initialize();
+
+  // Do not initialize if this dialect was just loaded.
+  if (!context->isDialectLoaded(getDialectNamespace()))
+    initialize();
 }
 )";