Index: clang-tidy/readability/IdentifierNamingCheck.cpp
===================================================================
--- clang-tidy/readability/IdentifierNamingCheck.cpp
+++ clang-tidy/readability/IdentifierNamingCheck.cpp
@@ -787,10 +787,22 @@
   }
 
   if (const auto *DeclRef = Result.Nodes.getNodeAs<DeclRefExpr>("declRef")) {
-    SourceRange Range = DeclRef->getNameInfo().getSourceRange();
-    addUsage(NamingCheckFailures, DeclRef->getDecl(), Range,
-             Result.SourceManager);
-    return;
+    const auto &Parents = Result.Context->getParents(*DeclRef);
+    bool LambdaDeclRef = false;
+
+    if (!Parents.empty()) {
+      const Stmt *ST = Parents[0].get<Stmt>();
+
+      if (ST && isa<LambdaExpr>(ST))
+        LambdaDeclRef = true;
+    }
+
+    if (!LambdaDeclRef) {
+      SourceRange Range = DeclRef->getNameInfo().getSourceRange();
+      addUsage(NamingCheckFailures, DeclRef->getDecl(), Range,
+               Result.SourceManager);
+      return;
+    }
   }
 
   if (const auto *Decl = Result.Nodes.getNodeAs<NamedDecl>("decl")) {
Index: test/clang-tidy/readability-identifier-naming.cpp
===================================================================
--- test/clang-tidy/readability-identifier-naming.cpp
+++ test/clang-tidy/readability-identifier-naming.cpp
@@ -501,3 +501,13 @@
 // CHECK-FIXES: {{^}}    int * const lc_PointerB = nullptr;{{$}}
 }
 
+
+bool Foo() {
+  bool Columns=false;
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: invalid case style for local variable 'Columns'
+// CHECK-FIXES: {{^}}  bool columns=false;
+  auto ptr=[&]{return Columns;}();
+// CHECK-FIXES: {{^}}  auto ptr=[&]{return columns;}();
+  return Columns;
+// CHECK-FIXES: {{^}}  return columns;
+}