diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76da31633d948..5c43724d12628 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+**NOTE**: Please refer to the [V3 Migration Guide](/doc/v3-migration-guide.md) 
+for details on updating existing applications using v1.x.y or v2.x.y.
+
 **NOTE**: [Future Breaking Changes](/doc/deprecated.md) lists anticipated
 breaking changes in the upcoming 3.x release. This release is scheduled for
 2024-12 or 2025-01.
diff --git a/README.md b/README.md
index 9914634f5fcb0..a4803943add63 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,9 @@
 This repository contains idiomatic C++ client libraries for the following
 [Google Cloud Platform](https://cloud.google.com/) services.
 
+> Please refer to the [V3 Migration Guide](/doc/v3-migration-guide.md) for
+> details on updating existing applications using v1.x.y or v2.x.y.
+
 > Please check the [CHANGELOG] for important announcements and upcoming changes.
 
 ## Quickstart
diff --git a/doc/v3-migration-guide.md b/doc/v3-migration-guide.md
new file mode 100644
index 0000000000000..9ac6298d27609
--- /dev/null
+++ b/doc/v3-migration-guide.md
@@ -0,0 +1,53 @@
+# `google-cloud-cpp` v3 Migration Guide
+
+This document is intended for users of previous major versions (v1.x.y, v2.x.y)
+of the `google-cloud-cpp` SDK who are moving to a release on the v3.x.y series.
+
+While this repository does not strictly follow semver, it does use the major
+version number to indicate large breaking changes. We strive to balance the
+frequency in which we introduce breaking changes with improvements to the SDK.
+Since our most recent major version increment, about 3 years ago, we have added
+new API surfaces that supersede the previous deprecated types and functions. As
+part of the v3 release series, we are decommissioning those deprecated API
+surfaces. This guide serves a central location to document how to migrate from
+the decommissioned API surfaces to their replacements.
+
+## C++17
+
+Depending on your build system of choice, you should set the appropriate flag
+for your compiler if it does not already default to `--std=c++17` or higher.
+
+## Bazel Central Registry
+
+Bazel is moving away from WORKSPACE file support to using modules from the Bazel
+Central Registry. Part of the v3.x.y release series includes supporting the new
+[google-cloud-cpp](https://registry.bazel.build/modules/google_cloud_cpp) Bazel
+module which can be added to your `MODULE.bazel` file as a dependency.
+
+## Dependencies
+
+### Previously Optional Dependencies that are now Required
+
+- `libcurl`
+- `nlohmann_json`
+- `opentelemetry-cpp`
+
+### Relocated Dependencies
+
+- `crc32c`
+
+## Decommissioned API Surfaces
+
+### Bazel
+
+### CMake
+
+### Common
+
+### Bigtable
+
+### Pubsub
+
+### Spanner
+
+### Storage