diff --git a/packages/react-relay/relay-hooks/EntryPointTypes.flow.js b/packages/react-relay/relay-hooks/EntryPointTypes.flow.js
index 5df282d16aec..8f0f1c92657c 100644
--- a/packages/react-relay/relay-hooks/EntryPointTypes.flow.js
+++ b/packages/react-relay/relay-hooks/EntryPointTypes.flow.js
@@ -22,10 +22,13 @@ import type {
   IEnvironment,
   Observable,
   OperationType,
+  PreloadableConcreteRequest,
   RequestParameters,
   VariablesOf as _VariablesOf,
 } from 'relay-runtime';
 
+export type {PreloadableConcreteRequest};
+
 export type VariablesOf<T> = _VariablesOf<T>;
 
 export type PreloadFetchPolicy =
@@ -46,17 +49,6 @@ export type LoadQueryOptions = {
   readonly __nameForWarning?: ?string,
 };
 
-export type PreloadableConcreteRequest<out TQuery extends OperationType> = {
-  kind: 'PreloadableConcreteRequest',
-  params: RequestParameters,
-  // Note: the phantom type parameter here helps ensures that the
-  // $Parameters.js value matches the type param provided to preloadQuery.
-  // We also need to add usage of this generic here,
-  // becuase not using the generic in the definition makes it
-  // unconstrained in the call to a function that accepts PreloadableConcreteRequest<T>
-  readonly __phantom__?: ?TQuery,
-};
-
 export type EnvironmentProviderOptions = {readonly [string]: unknown, ...};
 
 export type PreloadedQuery<
diff --git a/packages/relay-runtime/index.js b/packages/relay-runtime/index.js
index 196eb3c4b144..a485e966eff7 100644
--- a/packages/relay-runtime/index.js
+++ b/packages/relay-runtime/index.js
@@ -223,6 +223,7 @@ export type {
   ClientRequest,
   ConcreteUpdatableQuery,
   GeneratedNode,
+  PreloadableConcreteRequest,
   RequestParameters,
 } from './util/RelayConcreteNode';
 export type {
diff --git a/packages/relay-runtime/util/RelayConcreteNode.js b/packages/relay-runtime/util/RelayConcreteNode.js
index 6790a951eb5e..542479de7184 100644
--- a/packages/relay-runtime/util/RelayConcreteNode.js
+++ b/packages/relay-runtime/util/RelayConcreteNode.js
@@ -16,6 +16,7 @@ import type {
   NormalizationSplitOperation,
 } from './NormalizationNode';
 import type {ReaderFragment, ReaderInlineDataFragment} from './ReaderNode';
+import type {OperationType} from './RelayRuntimeTypes';
 
 /**
  * Represents a common GraphQL request that can be executed, an `operation`
@@ -35,6 +36,29 @@ export type ConcreteUpdatableQuery = {
   readonly fragment: ReaderFragment,
 };
 
+/**
+ * A lightweight stand-in for a `ConcreteRequest` emitted by the compiler for
+ * `@preloadable` queries: a `$Parameters.js` artifact containing only the
+ * `RequestParameters` (e.g. the persisted query `id`), so that the full
+ * normalization/reader AST can be code-split away from eager query loaders.
+ *
+ * This mirrors the type already published in the TypeScript declarations
+ * (`RelayConcreteNode.d.ts`) and re-exported from `relay-runtime`'s
+ * `index.d.ts`; the Flow definition previously only lived in `react-relay`
+ * (`EntryPointTypes.flow.js`), so Flow consumers could not import it from
+ * `relay-runtime` the way TypeScript consumers can.
+ */
+export type PreloadableConcreteRequest<out TQuery extends OperationType> = {
+  kind: 'PreloadableConcreteRequest',
+  params: RequestParameters,
+  // Note: the phantom type parameter here helps ensures that the
+  // $Parameters.js value matches the type param provided to preloadQuery.
+  // We also need to add usage of this generic here,
+  // becuase not using the generic in the definition makes it
+  // unconstrained in the call to a function that accepts PreloadableConcreteRequest<T>
+  readonly __phantom__?: ?TQuery,
+};
+
 export type NormalizationRootNode =
   ConcreteRequest | NormalizationSplitOperation;