diff --git a/openmp/runtime/src/kmp.h b/openmp/runtime/src/kmp.h
--- a/openmp/runtime/src/kmp.h
+++ b/openmp/runtime/src/kmp.h
@@ -4067,11 +4067,26 @@
 #define KMP_HIDDEN_HELPER_WORKER_THREAD(gtid)                                  \
   ((gtid) > 1 && (gtid) <= __kmp_hidden_helper_threads_num)
 
+#define KMP_HIDDEN_HELPER_TEAM(team)                                           \
+  (team->t.t_threads[0] == __kmp_hidden_helper_main_thread)
+
 // Map a gtid to a hidden helper thread. The first hidden helper thread, a.k.a
 // main thread, is skipped.
 #define KMP_GTID_TO_SHADOW_GTID(gtid)                                          \
   ((gtid) % (__kmp_hidden_helper_threads_num - 1) + 2)
 
+// Return the adjusted gtid value by subtracting from gtid the number
+// of hidden helper threads. This adjusted value is the gtid the thread would
+// have received if there were no hidden helper threads.
+static inline int __kmp_adjust_gtid_for_hidden_helpers(int gtid) {
+  int adjusted_gtid = gtid;
+  if (__kmp_hidden_helper_threads_num > 0 && gtid > 0 &&
+      gtid - __kmp_hidden_helper_threads_num >= 0) {
+    adjusted_gtid -= __kmp_hidden_helper_threads_num;
+  }
+  return adjusted_gtid;
+}
+
 // Support for error directive
 typedef enum kmp_severity_t {
   severity_warning = 1,
diff --git a/openmp/runtime/src/kmp_affinity.cpp b/openmp/runtime/src/kmp_affinity.cpp
--- a/openmp/runtime/src/kmp_affinity.cpp
+++ b/openmp/runtime/src/kmp_affinity.cpp
@@ -3940,7 +3940,8 @@
 
   if (KMP_AFFINITY_NON_PROC_BIND) {
     if ((__kmp_affinity_type == affinity_none) ||
-        (__kmp_affinity_type == affinity_balanced)) {
+        (__kmp_affinity_type == affinity_balanced) ||
+        KMP_HIDDEN_HELPER_THREAD(gtid)) {
 #if KMP_GROUP_AFFINITY
       if (__kmp_num_proc_groups > 1) {
         return;
@@ -3950,12 +3951,13 @@
       i = 0;
       mask = __kmp_affin_fullMask;
     } else {
+      int mask_idx = __kmp_adjust_gtid_for_hidden_helpers(gtid);
       KMP_DEBUG_ASSERT(__kmp_affinity_num_masks > 0);
-      i = (gtid + __kmp_affinity_offset) % __kmp_affinity_num_masks;
+      i = (mask_idx + __kmp_affinity_offset) % __kmp_affinity_num_masks;
       mask = KMP_CPU_INDEX(__kmp_affinity_masks, i);
     }
   } else {
-    if ((!isa_root) ||
+    if ((!isa_root) || KMP_HIDDEN_HELPER_THREAD(gtid) ||
         (__kmp_nested_proc_bind.bind_types[0] == proc_bind_false)) {
 #if KMP_GROUP_AFFINITY
       if (__kmp_num_proc_groups > 1) {
@@ -3967,15 +3969,16 @@
       mask = __kmp_affin_fullMask;
     } else {
       // int i = some hash function or just a counter that doesn't
-      // always start at 0.  Use gtid for now.
+      // always start at 0.  Use adjusted gtid for now.
+      int mask_idx = __kmp_adjust_gtid_for_hidden_helpers(gtid);
       KMP_DEBUG_ASSERT(__kmp_affinity_num_masks > 0);
-      i = (gtid + __kmp_affinity_offset) % __kmp_affinity_num_masks;
+      i = (mask_idx + __kmp_affinity_offset) % __kmp_affinity_num_masks;
       mask = KMP_CPU_INDEX(__kmp_affinity_masks, i);
     }
   }
 
   th->th.th_current_place = i;
-  if (isa_root) {
+  if (isa_root || KMP_HIDDEN_HELPER_THREAD(gtid)) {
     th->th.th_new_place = i;
     th->th.th_first_place = 0;
     th->th.th_last_place = __kmp_affinity_num_masks - 1;
@@ -3996,7 +3999,7 @@
 
   KMP_CPU_COPY(th->th.th_affin_mask, mask);
 
-  if (__kmp_affinity_verbose
+  if (__kmp_affinity_verbose && !KMP_HIDDEN_HELPER_THREAD(gtid)
       /* to avoid duplicate printing (will be correctly printed on barrier) */
       && (__kmp_affinity_type == affinity_none ||
           (i != KMP_PLACE_ALL && __kmp_affinity_type != affinity_balanced))) {
@@ -4007,6 +4010,17 @@
                __kmp_gettid(), gtid, buf);
   }
 
+#if KMP_DEBUG
+  // Hidden helper thread affinity only printed for debug builds
+  if (__kmp_affinity_verbose && KMP_HIDDEN_HELPER_THREAD(gtid)) {
+    char buf[KMP_AFFIN_MASK_PRINT_LEN];
+    __kmp_affinity_print_mask(buf, KMP_AFFIN_MASK_PRINT_LEN,
+                              th->th.th_affin_mask);
+    KMP_INFORM(BoundToOSProcSet, "KMP_AFFINITY (hidden helper thread)",
+               (kmp_int32)getpid(), __kmp_gettid(), gtid, buf);
+  }
+#endif
+
 #if KMP_OS_WINDOWS
   // On Windows* OS, the process affinity mask might have changed. If the user
   // didn't request affinity and this call fails, just continue silently.
@@ -4292,6 +4306,10 @@
   bool fine_gran = true;
   int tid = th->th.th_info.ds.ds_tid;
 
+  // Do not perform balanced affinity for the hidden helper threads
+  if (KMP_HIDDEN_HELPER_THREAD(__kmp_gtid_from_thread(th)))
+    return;
+
   switch (__kmp_affinity_gran) {
   case KMP_HW_THREAD:
     break;
diff --git a/openmp/runtime/src/kmp_runtime.cpp b/openmp/runtime/src/kmp_runtime.cpp
--- a/openmp/runtime/src/kmp_runtime.cpp
+++ b/openmp/runtime/src/kmp_runtime.cpp
@@ -4588,6 +4588,9 @@
 // thread's partition, and binds each worker to a thread in their partition.
 // The primary thread's partition should already include its current binding.
 static void __kmp_partition_places(kmp_team_t *team, int update_master_only) {
+  // Do not partition places for the hidden helper team
+  if (KMP_HIDDEN_HELPER_TEAM(team))
+    return;
   // Copy the primary thread's place partition to the team struct
   kmp_info_t *master_th = team->t.t_threads[0];
   KMP_DEBUG_ASSERT(master_th != NULL);