diff --git a/flang/lib/Semantics/check-omp-structure.cpp b/flang/lib/Semantics/check-omp-structure.cpp
--- a/flang/lib/Semantics/check-omp-structure.cpp
+++ b/flang/lib/Semantics/check-omp-structure.cpp
@@ -10,7 +10,6 @@
 #include "flang/Parser/parse-tree.h"
 #include "flang/Semantics/tools.h"
 #include <algorithm>
-
 namespace Fortran::semantics {
 
 // Use when clause falls under 'struct OmpClause' in 'parse-tree.h'.
@@ -1024,9 +1023,32 @@
 
 void OmpStructureChecker::Enter(const parser::OpenMPCriticalConstruct &x) {
   const auto &dir{std::get<parser::OmpCriticalDirective>(x.t)};
+  const auto &endDir{std::get<parser::OmpEndCriticalDirective>(x.t)};
   PushContextAndClauseSets(dir.source, llvm::omp::Directive::OMPD_critical);
   const auto &block{std::get<parser::Block>(x.t)};
   CheckNoBranching(block, llvm::omp::Directive::OMPD_critical, dir.source);
+  const auto &dirName{std::get<std::optional<parser::Name>>(dir.t)};
+  const auto &endDirName{std::get<std::optional<parser::Name>>(endDir.t)};
+  if (dirName && endDirName &&
+      dirName->ToString().compare(endDirName->ToString())) {
+    context_
+        .Say(endDirName->source,
+            parser::MessageFormattedText{
+                "CRITICAL directive names do not match"_err_en_US})
+        .Attach(dirName->source, "should be "_en_US);
+  } else if (dirName && !endDirName) {
+    context_
+        .Say(dirName->source,
+            parser::MessageFormattedText{
+                "CRITICAL directive names do not match"_err_en_US})
+        .Attach(dirName->source, "should be NULL"_en_US);
+  } else if (!dirName && endDirName) {
+    context_
+        .Say(endDirName->source,
+            parser::MessageFormattedText{
+                "CRITICAL directive names do not match"_err_en_US})
+        .Attach(endDirName->source, "should be NULL"_en_US);
+  }
 }
 
 void OmpStructureChecker::Leave(const parser::OpenMPCriticalConstruct &) {
diff --git a/flang/lib/Semantics/resolve-directives.cpp b/flang/lib/Semantics/resolve-directives.cpp
--- a/flang/lib/Semantics/resolve-directives.cpp
+++ b/flang/lib/Semantics/resolve-directives.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "resolve-directives.h"
-
 #include "check-acc-structure.h"
 #include "check-omp-structure.h"
 #include "resolve-names-utils.h"
@@ -293,6 +292,8 @@
 
   bool Pre(const parser::OpenMPBlockConstruct &);
   void Post(const parser::OpenMPBlockConstruct &);
+  bool Pre(const parser::OmpCriticalDirective &x);
+  bool Pre(const parser::OmpEndCriticalDirective &x);
 
   void Post(const parser::OmpBeginBlockDirective &) {
     GetContext().withinConstruct = true;
@@ -476,7 +477,7 @@
   static constexpr Symbol::Flags ompFlagsRequireNewSymbol{
       Symbol::Flag::OmpPrivate, Symbol::Flag::OmpLinear,
       Symbol::Flag::OmpFirstPrivate, Symbol::Flag::OmpLastPrivate,
-      Symbol::Flag::OmpReduction};
+      Symbol::Flag::OmpReduction, Symbol::Flag::OmpCriticalLock};
 
   static constexpr Symbol::Flags ompFlagsRequireMark{
       Symbol::Flag::OmpThreadprivate};
@@ -1374,6 +1375,22 @@
   return true;
 }
 
+bool OmpAttributeVisitor::Pre(const parser::OmpCriticalDirective &x) {
+  const auto &name{std::get<std::optional<parser::Name>>(x.t)};
+  if (name) {
+    ResolveOmpName(*name, Symbol::Flag::OmpCriticalLock);
+  }
+  return true;
+}
+
+bool OmpAttributeVisitor::Pre(const parser::OmpEndCriticalDirective &x) {
+  const auto &name{std::get<std::optional<parser::Name>>(x.t)};
+  if (name) {
+    ResolveOmpName(*name, Symbol::Flag::OmpCriticalLock);
+  }
+  return true;
+}
+
 bool OmpAttributeVisitor::Pre(const parser::OpenMPCriticalConstruct &x) {
   const auto &criticalDir{std::get<parser::OmpCriticalDirective>(x.t)};
   PushContext(criticalDir.source, llvm::omp::Directive::OMPD_critical);
@@ -1497,6 +1514,13 @@
         AddToContextObjectWithDSA(*resolvedSymbol, ompFlag);
       }
     }
+  } else if (ompFlagsRequireNewSymbol.test(ompFlag)) {
+    const auto pair{GetContext().scope.try_emplace(
+        name.source, Attrs{}, ObjectEntityDetails{})};
+    CHECK(pair.second);
+    name.symbol = &pair.first->second.get();
+  } else {
+    DIE("OpenMP Name resolution failed");
   }
 }
 
diff --git a/flang/test/Semantics/omp-sync-critical01.f90 b/flang/test/Semantics/omp-sync-critical01.f90
new file mode 100644
--- /dev/null
+++ b/flang/test/Semantics/omp-sync-critical01.f90
@@ -0,0 +1,41 @@
+! RUN: %python %S/test_errors.py %s %flang -fopenmp
+
+! OpenMP Version 5.0
+! 2.17.1 critical construct
+! CRITICAL start and end CRITICAL directive names mismatch
+integer function timer_tick_sec()
+   implicit none
+   integer t
+
+   !$OMP CRITICAL
+   t = t + 1
+   !$OMP END CRITICAL
+
+   !$OMP CRITICAL (foo)
+   t = t + 1
+   !$OMP END CRITICAL (foo)
+
+   !$OMP CRITICAL (foo)
+   t = t + 1
+   !ERROR: CRITICAL directive names do not match
+   !$OMP END CRITICAL (bar)
+
+   !$OMP CRITICAL (bar)
+   t = t + 1
+   !ERROR: CRITICAL directive names do not match
+   !$OMP END CRITICAL (foo)
+
+   !ERROR: CRITICAL directive names do not match
+   !$OMP CRITICAL (bar)
+   t = t + 1
+   !$OMP END CRITICAL
+
+   !$OMP CRITICAL
+   t = t + 1
+   !ERROR: CRITICAL directive names do not match
+   !$OMP END CRITICAL (foo)
+
+   timer_tick_sec = t
+   return
+
+end function timer_tick_sec
diff --git a/flang/test/Semantics/omp-sync-critical02.f90 b/flang/test/Semantics/omp-sync-critical02.f90
new file mode 100644
--- /dev/null
+++ b/flang/test/Semantics/omp-sync-critical02.f90
@@ -0,0 +1,17 @@
+! RUN: %python %S/test_errors.py %s %flang -fopenmp
+
+! OpenMP Version 5.0
+! 2.17.1 critical construct
+! Test case added to ensure proper semantic checks of CRITICAL names. See https://bugs.llvm.org/show_bug.cgi?id=48145 for details
+integer function timer_tick_sec()
+   implicit none
+   integer t
+
+   !$OMP CRITICAL (foo)
+   t = t + 1
+   !$OMP END CRITICAL (foo)
+
+   timer_tick_sec = t
+   return
+
+end function timer_tick_sec