The Podcasts app allows you to easily subscribe to podcasts that can automatically update when new episodes are available. Over time, you may decide that you don't want to follow a particular podcast as closely anymore. The Podcasts app allows you to unsubscribe just as easily as you subscribed.
Launch the Podcasts app from the Home screen of your iPhone or iPad.
Under the Podcasts tab, tap on the name of the podcast series you'd like to unsubscribe from.
Towards the top, tap on the Settings button.
There is a toggle to edit your subscription, turn the Subscription toggle to Off.
The Podcasts app will now stop updating when new episodes of that particular podcast is available. If you don't want any of the podcasts on your iPhone or iPad, you can also delete older episodes.