diff --git a/flang/lib/Semantics/check-directive-structure.h b/flang/lib/Semantics/check-directive-structure.h
--- a/flang/lib/Semantics/check-directive-structure.h
+++ b/flang/lib/Semantics/check-directive-structure.h
@@ -209,6 +209,12 @@
 
   int GetSIMDNest() { return simdNest_; }
 
+  void EnterTargetBlockOnlyTeams() { targetBlockOnlyTeams_ = true; }
+
+  void ExitTargetBlockOnlyTeams() { targetBlockOnlyTeams_ = false; }
+
+  bool GetTargetBlockOnlyTeams() { return targetBlockOnlyTeams_; }
+
   // Check if the given clause is present in the current context
   const PC *FindClause(C type) {
     auto it{GetContext().clauseInfo.find(type)};
@@ -321,6 +327,7 @@
 
   std::string ClauseSetToString(const common::EnumSet<C, ClauseEnumSize> set);
   int simdNest_{0};
+  bool targetBlockOnlyTeams_{false};
 };
 
 template <typename D, typename C, typename PC, std::size_t ClauseEnumSize>
diff --git a/flang/lib/Semantics/check-omp-structure.h b/flang/lib/Semantics/check-omp-structure.h
--- a/flang/lib/Semantics/check-omp-structure.h
+++ b/flang/lib/Semantics/check-omp-structure.h
@@ -218,6 +218,7 @@
   void SetLoopInfo(const parser::OpenMPLoopConstruct &x);
   void CheckIsLoopIvPartOfClause(
       llvmOmpClause clause, const parser::OmpObjectList &ompObjectList);
+  bool CheckTargetBlockOnlyTeams(const parser::Block &);
   void CheckWorkshareBlockStmts(const parser::Block &, parser::CharBlock);
 
   void CheckLoopItrVariableIsInt(const parser::OpenMPLoopConstruct &x);
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
@@ -625,11 +625,36 @@
     if (GetContext().directive == llvm::omp::Directive::OMPD_master) {
       CheckMasterNesting(x);
     }
+    // A teams region can only be strictly nested within the implicit parallel
+    // region or a target region.
+    if (GetContext().directive == llvm::omp::Directive::OMPD_teams &&
+        GetContextParent().directive != llvm::omp::Directive::OMPD_target &&
+        GetContextParent().directive != llvm::omp::Directive::OMPD_teams) {
+      context_.Say(parser::FindSourceLocation(x),
+          "%s region can only be strictly nested within the implicit parallel"
+          "region or TARGET region"_err_en_US,
+          ContextDirectiveAsFortran());
+    }
+    // If a teams construct is nested within a target construct, that target
+    // construct must contain no statements, declarations or directives outside
+    // of the teams construct.
+    if (GetContext().directive == llvm::omp::Directive::OMPD_teams &&
+        GetContextParent().directive == llvm::omp::Directive::OMPD_target &&
+        !GetTargetBlockOnlyTeams()) {
+      context_.Say(GetContextParent().directiveSource,
+          "TARGET construct with nested TEAMS region contains statements "
+          "outside of the TEAMS construct"_err_en_US);
+    }
   }
 
   CheckNoBranching(block, beginDir.v, beginDir.source);
 
   switch (beginDir.v) {
+  case llvm::omp::Directive::OMPD_target:
+    if (CheckTargetBlockOnlyTeams(block)) {
+      EnterTargetBlockOnlyTeams();
+    }
+    break;
   case llvm::omp::OMPD_workshare:
   case llvm::omp::OMPD_parallel_workshare:
     CheckWorkshareBlockStmts(block, beginDir.source);
@@ -683,6 +708,9 @@
 }
 
 void OmpStructureChecker::Leave(const parser::OpenMPBlockConstruct &) {
+  if (GetContext().directive == llvm::omp::Directive::OMPD_target) {
+    ExitTargetBlockOnlyTeams();
+  }
   dirContext_.pop_back();
 }
 
@@ -1790,6 +1818,31 @@
   }
 }
 
+bool OmpStructureChecker::CheckTargetBlockOnlyTeams(
+    const parser::Block &block) {
+  bool nestedTeams{false};
+  auto it{block.begin()};
+
+  if (const auto *ompConstruct{parser::Unwrap<parser::OpenMPConstruct>(*it)}) {
+    if (const auto *ompBlockConstruct{
+            std::get_if<parser::OpenMPBlockConstruct>(&ompConstruct->u)}) {
+      const auto &beginBlockDir{
+          std::get<parser::OmpBeginBlockDirective>(ompBlockConstruct->t)};
+      const auto &beginDir{
+          std::get<parser::OmpBlockDirective>(beginBlockDir.t)};
+      if (beginDir.v == llvm::omp::Directive::OMPD_teams) {
+        nestedTeams = true;
+      }
+    }
+  }
+
+  if (nestedTeams && ++it == block.end()) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
 void OmpStructureChecker::CheckWorkshareBlockStmts(
     const parser::Block &block, parser::CharBlock source) {
   OmpWorkshareBlockChecker ompWorkshareBlockChecker{context_, source};
diff --git a/flang/test/Semantics/omp-teams01.f90 b/flang/test/Semantics/omp-teams01.f90
new file mode 100644
--- /dev/null
+++ b/flang/test/Semantics/omp-teams01.f90
@@ -0,0 +1,112 @@
+! RUN: %S/test_errors.sh %s %t %flang -fopenmp
+! REQUIRES: shell
+
+! OpenMP Version 5.0
+! Check OpenMP construct validity for the following directives:
+! 2.7 Teams Construct
+
+program main
+  integer :: i, j, N = 10
+  real :: a, b, c
+
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+
+  !$omp target
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end target
+
+  !$omp target
+  !$omp parallel
+  !ERROR: TEAMS region can only be strictly nested within the implicit parallelregion or TARGET region
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end parallel
+  !$omp end target
+
+  !$omp parallel
+  !ERROR: TEAMS region can only be strictly nested within the implicit parallelregion or TARGET region
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end parallel
+
+  !$omp do
+  do i = 1, N
+  !ERROR: TEAMS region can only be strictly nested within the implicit parallelregion or TARGET region
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  end do
+
+  !$omp master
+  !ERROR: TEAMS region can only be strictly nested within the implicit parallelregion or TARGET region
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end master
+
+  !$omp target parallel
+  !ERROR: TEAMS region can only be strictly nested within the implicit parallelregion or TARGET region
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end target parallel
+
+  !$omp target
+  !$omp teams
+  !ERROR: Only `DISTRIBUTE` or `PARALLEL` regions are allowed to be strictly nested inside `TEAMS` region.
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end teams
+  !$omp end target
+
+  !$omp target teams
+  !ERROR: TEAMS region can only be strictly nested within the implicit parallelregion or TARGET region
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end target teams
+
+  !ERROR: TARGET construct with nested TEAMS region contains statements outside of the TEAMS construct
+  !$omp target
+  do i = 1, N
+    !$omp teams
+    a = 3.14
+    !$omp end teams
+  enddo
+  !$omp end target
+
+  !ERROR: TARGET construct with nested TEAMS region contains statements outside of the TEAMS construct
+  !$omp target
+  if (i .GT. 1) then
+    if (j .GT. 1) then
+      !$omp teams
+      a = 3.14
+      !$omp end teams
+    end if
+  end if
+  !$omp end target
+
+  !ERROR: TARGET construct with nested TEAMS region contains statements outside of the TEAMS construct
+  !$omp target
+  b = 3.14
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  !$omp end target
+
+  !ERROR: TARGET construct with nested TEAMS region contains statements outside of the TEAMS construct
+  !$omp target
+  !$omp teams
+  a = 3.14
+  !$omp end teams
+  c = 3.14
+  !$omp end target
+
+end program main