diff --git a/.changeset/wild-rice-love.md b/.changeset/wild-rice-love.md
new file mode 100644
index 00000000000..2ab720d957f
--- /dev/null
+++ b/.changeset/wild-rice-love.md
@@ -0,0 +1,6 @@
+---
+"@smithy/smithy-client": minor
+"@smithy/core": minor
+---
+
+move serde functions from smithy-client to core/serde
diff --git a/packages/smithy-client/src/date-utils.spec.ts b/packages/core/src/submodules/serde/date-utils.spec.ts
similarity index 100%
rename from packages/smithy-client/src/date-utils.spec.ts
rename to packages/core/src/submodules/serde/date-utils.spec.ts
diff --git a/packages/smithy-client/src/date-utils.ts b/packages/core/src/submodules/serde/date-utils.ts
similarity index 100%
rename from packages/smithy-client/src/date-utils.ts
rename to packages/core/src/submodules/serde/date-utils.ts
diff --git a/packages/core/src/submodules/serde/index.ts b/packages/core/src/submodules/serde/index.ts
index a70d0dda874..e0d4e038320 100644
--- a/packages/core/src/submodules/serde/index.ts
+++ b/packages/core/src/submodules/serde/index.ts
@@ -1 +1,7 @@
+export * from "./parse-utils";
+export * from "./date-utils";
+export * from "./quote-header";
+export * from "./split-header";
 export * from "./value/NumericValue";
+export * from "./lazy-json";
+export * from "./split-every";
diff --git a/packages/smithy-client/src/lazy-json.spec.ts b/packages/core/src/submodules/serde/lazy-json.spec.ts
similarity index 100%
rename from packages/smithy-client/src/lazy-json.spec.ts
rename to packages/core/src/submodules/serde/lazy-json.spec.ts
diff --git a/packages/smithy-client/src/lazy-json.ts b/packages/core/src/submodules/serde/lazy-json.ts
similarity index 100%
rename from packages/smithy-client/src/lazy-json.ts
rename to packages/core/src/submodules/serde/lazy-json.ts
diff --git a/packages/smithy-client/src/parse-utils.spec.ts b/packages/core/src/submodules/serde/parse-utils.spec.ts
similarity index 100%
rename from packages/smithy-client/src/parse-utils.spec.ts
rename to packages/core/src/submodules/serde/parse-utils.spec.ts
diff --git a/packages/smithy-client/src/parse-utils.ts b/packages/core/src/submodules/serde/parse-utils.ts
similarity index 100%
rename from packages/smithy-client/src/parse-utils.ts
rename to packages/core/src/submodules/serde/parse-utils.ts
diff --git a/packages/smithy-client/src/quote-header.spec.ts b/packages/core/src/submodules/serde/quote-header.spec.ts
similarity index 100%
rename from packages/smithy-client/src/quote-header.spec.ts
rename to packages/core/src/submodules/serde/quote-header.spec.ts
diff --git a/packages/smithy-client/src/quote-header.ts b/packages/core/src/submodules/serde/quote-header.ts
similarity index 100%
rename from packages/smithy-client/src/quote-header.ts
rename to packages/core/src/submodules/serde/quote-header.ts
diff --git a/packages/smithy-client/src/split-every.spec.ts b/packages/core/src/submodules/serde/split-every.spec.ts
similarity index 100%
rename from packages/smithy-client/src/split-every.spec.ts
rename to packages/core/src/submodules/serde/split-every.spec.ts
diff --git a/packages/smithy-client/src/split-every.ts b/packages/core/src/submodules/serde/split-every.ts
similarity index 100%
rename from packages/smithy-client/src/split-every.ts
rename to packages/core/src/submodules/serde/split-every.ts
diff --git a/packages/smithy-client/src/split-header.spec.ts b/packages/core/src/submodules/serde/split-header.spec.ts
similarity index 100%
rename from packages/smithy-client/src/split-header.spec.ts
rename to packages/core/src/submodules/serde/split-header.spec.ts
diff --git a/packages/smithy-client/src/split-header.ts b/packages/core/src/submodules/serde/split-header.ts
similarity index 100%
rename from packages/smithy-client/src/split-header.ts
rename to packages/core/src/submodules/serde/split-header.ts
diff --git a/packages/smithy-client/src/index.ts b/packages/smithy-client/src/index.ts
index 4a4ac197236..5b0358d5532 100644
--- a/packages/smithy-client/src/index.ts
+++ b/packages/smithy-client/src/index.ts
@@ -4,7 +4,6 @@ export * from "./collect-stream-body";
 export * from "./command";
 export * from "./constants";
 export * from "./create-aggregated-client";
-export * from "./date-utils";
 export * from "./default-error-handler";
 export * from "./defaults-mode";
 export * from "./emitWarningIfUnsupportedVersion";
@@ -14,13 +13,10 @@ export * from "./extensions";
 export * from "./get-array-if-single-item";
 export * from "./get-value-from-text-node";
 export * from "./is-serializable-header-value";
-export * from "./lazy-json";
 export * from "./NoOpLogger";
 export * from "./object-mapping";
-export * from "./parse-utils";
-export * from "./quote-header";
 export * from "./resolve-path";
 export * from "./ser-utils";
 export * from "./serde-json";
-export * from "./split-every";
-export * from "./split-header";
+
+export * from "@smithy/core/serde";