I believe the products we design are aimless unless we have a compass for our existence, so It's important for a designer to listen to some existential thoughts, hence why I like

On being with Krista Tippett

For actual design podcasts that the folks haven't shared yet;

Workmode - haven't listened to it much but sounds pretty neat

Crew.co Podcasts

Australian Design Radio - This is one of the best bespoke site i've seen, so it gets my respect.