diff --git a/packages/react-native-codegen/src/parsers/flow/components/__test_fixtures__/failures.js b/packages/react-native-codegen/src/parsers/flow/components/__test_fixtures__/failures.js
index 469e51c90424db..7ce34a5e5ded9b 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/__test_fixtures__/failures.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/__test_fixtures__/failures.js
@@ -305,6 +305,104 @@ export default (codegenNativeComponent<ModuleProps>(
 ): NativeComponent<ModuleProps>);
 `;
 
+const PROPS_CONFLICT_NAMES = `
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+import type {ViewProps} from 'ViewPropTypes';
+import type {NativeComponent} from 'codegenNativeComponent';
+
+const codegenNativeComponent = require('codegenNativeComponent');
+
+export type ModuleProps = $ReadOnly<{|
+  ...ViewProps,
+  isEnabled: string,
+
+  isEnabled: boolean,
+|}>;
+
+export default (codegenNativeComponent<ModuleProps>(
+  'Module',
+): NativeComponent<ModuleProps>);
+`;
+
+const PROPS_CONFLICT_WITH_SPREAD_PROPS = `
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+import type {ViewProps} from 'ViewPropTypes';
+import type {NativeComponent} from 'codegenNativeComponent';
+
+const codegenNativeComponent = require('codegenNativeComponent');
+
+type PropsInFile = $ReadOnly<{|
+  isEnabled: boolean,
+|}>;
+
+export type ModuleProps = $ReadOnly<{|
+  ...ViewProps,
+
+  ...PropsInFile,
+  isEnabled: boolean,
+|}>;
+
+export default (codegenNativeComponent<ModuleProps>(
+  'Module',
+): NativeComponent<ModuleProps>);
+`;
+
+const PROPS_SPREAD_CONFLICTS_WITH_PROPS = `
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+import type {ViewProps} from 'ViewPropTypes';
+import type {NativeComponent} from 'codegenNativeComponent';
+
+const codegenNativeComponent = require('codegenNativeComponent');
+
+type PropsInFile = $ReadOnly<{|
+  isEnabled: boolean,
+|}>;
+
+export type ModuleProps = $ReadOnly<{|
+  ...ViewProps,
+
+  isEnabled: boolean,
+  ...PropsInFile,
+|}>;
+
+export default (codegenNativeComponent<ModuleProps>(
+  'Module',
+): NativeComponent<ModuleProps>);
+`;
+
 module.exports = {
   COMMANDS_DEFINED_INLINE,
   COMMANDS_DEFINED_MULTIPLE_TIMES,
@@ -314,4 +412,7 @@ module.exports = {
   COMMANDS_DEFINED_WITH_NULLABLE_REF,
   NULLABLE_WITH_DEFAULT,
   NON_OPTIONAL_KEY_WITH_DEFAULT_VALUE,
+  PROPS_CONFLICT_NAMES,
+  PROPS_CONFLICT_WITH_SPREAD_PROPS,
+  PROPS_SPREAD_CONFLICTS_WITH_PROPS,
 };
diff --git a/packages/react-native-codegen/src/parsers/flow/components/__tests__/__snapshots__/component-parser-test.js.snap b/packages/react-native-codegen/src/parsers/flow/components/__tests__/__snapshots__/component-parser-test.js.snap
index f22054b23e6ba8..f55fe241dde288 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/__tests__/__snapshots__/component-parser-test.js.snap
+++ b/packages/react-native-codegen/src/parsers/flow/components/__tests__/__snapshots__/component-parser-test.js.snap
@@ -16,6 +16,12 @@ exports[`RN Codegen Flow Parser Fails with error message NON_OPTIONAL_KEY_WITH_D
 
 exports[`RN Codegen Flow Parser Fails with error message NULLABLE_WITH_DEFAULT 1`] = `"WithDefault<> is optional and does not need to be marked as optional. Please remove the ? annotation in front of it."`;
 
+exports[`RN Codegen Flow Parser Fails with error message PROPS_CONFLICT_NAMES 1`] = `"A prop was already defined with the name isEnabled"`;
+
+exports[`RN Codegen Flow Parser Fails with error message PROPS_CONFLICT_WITH_SPREAD_PROPS 1`] = `"A prop was already defined with the name isEnabled"`;
+
+exports[`RN Codegen Flow Parser Fails with error message PROPS_SPREAD_CONFLICTS_WITH_PROPS 1`] = `"A prop was already defined with the name isEnabled"`;
+
 exports[`RN Codegen Flow Parser can generate fixture ALL_PROP_TYPES_NO_EVENTS 1`] = `
 Object {
   "modules": Object {
diff --git a/packages/react-native-codegen/src/parsers/flow/components/props.js b/packages/react-native-codegen/src/parsers/flow/components/props.js
index 7f682975035c95..da299e04626872 100644
--- a/packages/react-native-codegen/src/parsers/flow/components/props.js
+++ b/packages/react-native-codegen/src/parsers/flow/components/props.js
@@ -302,6 +302,17 @@ function buildPropSchema(property, types: TypeMap): ?PropTypeShape {
 // $FlowFixMe there's no flowtype for ASTs
 type PropAST = Object;
 
+function verifyPropNotAlreadyDefined(
+  props: $ReadOnlyArray<PropAST>,
+  needleProp: PropAST,
+) {
+  const propName = needleProp.key.name;
+  const foundProp = props.some(prop => prop.key.name === propName);
+  if (foundProp) {
+    throw new Error(`A prop was already defined with the name ${propName}`);
+  }
+}
+
 function flattenProperties(
   typeDefinition: $ReadOnlyArray<PropAST>,
   types: TypeMap,
@@ -319,8 +330,12 @@ function flattenProperties(
     })
     .reduce((acc, item) => {
       if (Array.isArray(item)) {
+        item.forEach(prop => {
+          verifyPropNotAlreadyDefined(acc, prop);
+        });
         return acc.concat(item);
       } else {
+        verifyPropNotAlreadyDefined(acc, item);
         acc.push(item);
         return acc;
       }