diff --git a/libcxx/include/vector b/libcxx/include/vector
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -302,6 +302,7 @@
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
+#include <__utility/transaction.h>
 #include <climits>
 #include <cstdlib>
 #include <cstring>
@@ -334,10 +335,33 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+template <class _Vec>
+class __vector_delete {
+public:
+  _LIBCPP_CONSTEXPR __vector_delete(_Vec& __vec) : __vec_(__vec) {}
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void operator()() {
+    __vec_.__annotate_delete();
+    std::__debug_db_erase_c(this);
+
+    if (__vec_.__begin_ != nullptr)
+    {
+      __vec_.__clear();
+      _Vec::__alloc_traits::deallocate(__vec_.__alloc(), __vec_.__begin_, __vec_.capacity());
+    }
+  }
+
+private:
+  _Vec& __vec_;
+};
+
 template <class _Tp, class _Allocator /* = allocator<_Tp> */>
 class _LIBCPP_TEMPLATE_VIS vector
 {
 private:
+  template <class>
+  friend class __vector_delete;
+
     typedef allocator<_Tp>                                  __default_allocator_type;
 public:
     typedef vector                                          __self;
@@ -423,18 +447,7 @@
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
   vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a);
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    ~vector()
-    {
-      __annotate_delete();
-      std::__debug_db_erase_c(this);
-
-      if (this->__begin_ != nullptr)
-      {
-        __clear();
-        __alloc_traits::deallocate(__alloc(), this->__begin_, capacity());
-      }
-    }
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI ~vector() { __vector_delete<vector>(*this)(); }
 
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(const vector& __x);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(const vector& __x, const __type_identity_t<allocator_type>& __a);
@@ -1058,7 +1071,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__n);
+        __guard.__complete();
     }
 }
 
@@ -1072,7 +1087,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__n);
+        __guard.__complete();
     }
 }
 #endif
@@ -1085,7 +1102,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__n, __x);
+        __guard.__complete();
     }
 }
 
@@ -1097,8 +1116,10 @@
 vector<_Tp, _Allocator>::vector(_InputIterator __first, _InputIterator __last)
 {
     std::__debug_db_insert_c(this);
+    auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
     for (; __first != __last; ++__first)
         emplace_back(*__first);
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1110,8 +1131,10 @@
     : __end_cap_(nullptr, __a)
 {
     std::__debug_db_insert_c(this);
+    auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
     for (; __first != __last; ++__first)
         emplace_back(*__first);
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1126,7 +1149,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__first, __last, __n);
+        __guard.__complete();
     }
 }
 
@@ -1143,7 +1168,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__first, __last, __n);
+        __guard.__complete();
     }
 }
 
@@ -1157,7 +1184,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__x.__begin_, __x.__end_, __n);
+        __guard.__complete();
     }
 }
 
@@ -1171,7 +1200,9 @@
     if (__n > 0)
     {
         __vallocate(__n);
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__x.__begin_, __x.__end_, __n);
+        __guard.__complete();
     }
 }
 
@@ -1212,7 +1243,9 @@
     else
     {
         typedef move_iterator<iterator> _Ip;
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         assign(_Ip(__x.begin()), _Ip(__x.end()));
+        __guard.__complete();
     }
 }
 
@@ -1227,7 +1260,9 @@
     if (__il.size() > 0)
     {
         __vallocate(__il.size());
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__il.begin(), __il.end(), __il.size());
+        __guard.__complete();
     }
 }
 
@@ -1241,7 +1276,9 @@
     if (__il.size() > 0)
     {
         __vallocate(__il.size());
+        auto __guard = std::__make_transaction(__vector_delete<vector>(*this));
         __construct_at_end(__il.begin(), __il.end(), __il.size());
+        __guard.__complete();
     }
 }
 
diff --git a/libcxx/test/std/containers/sequences/vector/vector.cons/throwing.pass.cpp b/libcxx/test/std/containers/sequences/vector/vector.cons/throwing.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/containers/sequences/vector/vector.cons/throwing.pass.cpp
@@ -0,0 +1,206 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: no-exceptions
+
+// Check that vector constructors don't leak memory when an operation inside the constructor throws an exception
+
+#include <type_traits>
+#include <vector>
+
+#include "test_iterators.h"
+
+template <class T>
+struct Allocator {
+  using value_type      = T;
+  using is_always_equal = std::false_type;
+
+  Allocator(bool should_throw = true) {
+    if (should_throw)
+      throw 0;
+  }
+
+  T* allocate(int n) { return std::allocator<T>().allocate(n); }
+  void deallocate(T* ptr, int n) { std::allocator<T>().deallocate(ptr, n); }
+
+  friend bool operator==(const Allocator&, const Allocator&) { return false; }
+};
+
+struct ThrowingT {
+  int* throw_after_n_ = nullptr;
+  ThrowingT() { throw 0; }
+
+  ThrowingT(int& throw_after_n) : throw_after_n_(&throw_after_n) {
+    if (throw_after_n == 0)
+      throw 0;
+    --throw_after_n;
+  }
+
+  ThrowingT(const ThrowingT&) {
+    if (throw_after_n_ == nullptr || *throw_after_n_ == 0)
+      throw 1;
+    --*throw_after_n_;
+  }
+
+  ThrowingT& operator=(const ThrowingT&) {
+    if (throw_after_n_ == nullptr || *throw_after_n_ == 0)
+      throw 1;
+    --*throw_after_n_;
+    return *this;
+  }
+};
+
+template <class IterCat>
+struct Iterator {
+  using iterator_category = IterCat;
+  using difference_type   = std::ptrdiff_t;
+  using value_type        = int;
+  using reference         = int&;
+  using pointer           = int*;
+
+  int i_;
+  Iterator(int i = 0) : i_(i) {}
+  int& operator*() {
+    if (i_ == 1)
+      throw 1;
+    return i_;
+  }
+
+  friend bool operator==(const Iterator& lhs, const Iterator& rhs) { return lhs.i_ == rhs.i_; }
+
+  friend bool operator!=(const Iterator& lhs, const Iterator& rhs) { return lhs.i_ != rhs.i_; }
+
+  Iterator& operator++() {
+    ++i_;
+    return *this;
+  }
+
+  Iterator operator++(int) {
+    auto tmp = *this;
+    ++i_;
+    return tmp;
+  }
+};
+
+int main(int, char**) {
+  using AllocVec = std::vector<int, Allocator<int>>;
+  try { // Throw in default constructor
+    AllocVec vec;
+  } catch (int) {
+  }
+
+  try { // Throw in count constructor from allocator
+    AllocVec get_alloc(0);
+  } catch (int) {
+  }
+
+  try { // Throw in count constructor from type
+    std::vector<ThrowingT> get_alloc(1);
+  } catch (int) {
+  }
+
+  try { // Throw in count + value_type constructor from type
+    int throw_after = 1;
+    ThrowingT v(throw_after);
+    std::vector<ThrowingT> get_alloc(1, v);
+  } catch (int) {
+  }
+
+  try { // Throw in count + allocator constructor from allocator
+    Allocator<int> alloc(false);
+    AllocVec get_alloc(0, alloc);
+  } catch (int) {
+  }
+
+  try { // Throw in count + allocator constructor from the type
+    std::vector<ThrowingT> vec(1, std::allocator<ThrowingT>());
+  } catch (int) {
+  }
+
+  try { // Throw in iterator constructor from input iterator
+    std::vector<int> vec((Iterator<std::input_iterator_tag>()), Iterator<std::input_iterator_tag>(2));
+  } catch (int) {
+  }
+
+  try { // Throw in iterator constructor from forward iterator
+    std::vector<int> vec((Iterator<std::forward_iterator_tag>()), Iterator<std::forward_iterator_tag>(2));
+  } catch (int) {
+  }
+
+  try { // Throw in iterator constructor from allocator
+    int a[] = {1, 2};
+    AllocVec vec(cpp17_input_iterator<int*>(a), cpp17_input_iterator<int*>(a + 2));
+  } catch (int) {
+  }
+
+  try { // Throw in iterator + allocator constructor from input iterator
+    std::allocator<int> alloc;
+    std::vector<int> vec(Iterator<std::input_iterator_tag>(), Iterator<std::input_iterator_tag>(2), alloc);
+  } catch (int) {
+  }
+
+  try { // Throw in iterator + allocator constructor from forward iterator
+    std::allocator<int> alloc;
+    std::vector<int> vec(Iterator<std::forward_iterator_tag>(), Iterator<std::forward_iterator_tag>(2), alloc);
+  } catch (int) {
+  }
+
+  try { // Throw in iterator + allocator constructor from allocator
+    int a[] = {1, 2};
+    Allocator<int> alloc(false);
+    AllocVec vec(cpp17_input_iterator<int*>(a), cpp17_input_iterator<int*>(a + 2), alloc);
+  } catch (int) {
+  }
+
+  try { // Throw in iterator + allocator constructor from allocator
+    int a[] = {1, 2};
+    Allocator<int> alloc(false);
+    AllocVec vec(forward_iterator<int*>(a), forward_iterator<int*>(a + 2), alloc);
+  } catch (int) {
+  }
+
+  try { // Throw in copy constructor from type
+    std::vector<ThrowingT> vec;
+    int throw_after = 0;
+    vec.emplace_back(throw_after);
+    auto vec2 = vec;
+  } catch (int) {
+  }
+
+  try { // Throw in allocator copy constructor from type
+    std::vector<ThrowingT> vec;
+    int throw_after = 1;
+    vec.emplace_back(throw_after);
+    std::vector<ThrowingT> vec2(vec, std::allocator<int>());
+  } catch (int) {
+  }
+
+  try { // Throw in allocator move constructor from type
+    std::vector<ThrowingT, Allocator<ThrowingT>> vec(Allocator<ThrowingT>(false));
+    int throw_after = 1;
+    vec.emplace_back(throw_after);
+    std::vector<ThrowingT, Allocator<ThrowingT>> vec2(std::move(vec), Allocator<ThrowingT>(false));
+  } catch (int) {
+  }
+
+#if TEST_STD_VER >= 11
+  try { // Throw in initializer_list constructor from type
+    int throw_after = 1;
+    std::vector<ThrowingT> vec({ThrowingT(throw_after)});
+  } catch (int) {
+  }
+
+  try { // Throw in initializer_list constructor from type
+    int throw_after = 1;
+    std::vector<ThrowingT> vec({ThrowingT(throw_after)}, std::allocator<ThrowingT>());
+  } catch (int) {
+  }
+#endif // TEST_STD_VER >= 11
+
+  return 0;
+}