that still use the alias name are treated as reads of a nonexistent
namespace (empty results, not an error), so migrate readers off the alias
first.

The call returns once no reader still resolves the alias, which takes about
a second; size client timeouts accordingly. A retried delete that returns
404 means the alias is already gone and carries the same guarantee.

For guidance and examples, see [Manage namespace aliases](/guides/manage-data-namespace-aliases-manage-aliases).

:::code-group
```bash curl
# To get the unique host for an index,
# see https://docs.pinecone.io/guides/manage-data/target-an-index
PINECONE_API_KEY="YOUR_API_KEY"
INDEX_HOST="INDEX_HOST"
ALIAS_NAME="dataset"

curl -X DELETE "https://$INDEX_HOST/namespace-aliases/$ALIAS_NAME" \
    -H "Api-Key: $PINECONE_API_KEY" \
    -H "X-Pinecone-Api-Version: 2026-07"
```
:::

`DELETE /namespace-aliases/{alias_name}`

:::code-group
```json title="200"
{}
```

```json title="400"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```

```json title="404"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```

```json title="4XX"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```

```json title="5XX"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```
:::

#### Authorizations

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `Api-Key` | `string` | - |  |

An API Key is required to call Pinecone APIs. Get yours from the [console](https://app.pinecone.io/).

#### Headers

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `X-Pinecone-Api-Version` | `string` | `2026-07` | Required date-based version header |

#### Path Parameters

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `alias_name` | `string` | - | The name of the alias. Must be 1-512 characters of printable ASCII, excluding space and / ? # % & = \ ; +. Required string length: 1 - 512 |

#### Response

`200` — A successful response.

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `response?` | `object` | - | The response for the delete operation. |

## Related pages

- [List namespace aliases](./database-data-plane-list-namespace-aliases.md)
- [Create a namespace alias](./database-data-plane-create-namespace-alias.md)
- [Describe a namespace alias](./database-data-plane-describe-namespace-alias.md)
- [Repoint a namespace alias](./database-data-plane-repoint-namespace-alias.md)

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