These podcasts explicitly cover bitcoin only.

Stephan LiveraBitcoin and Austrian Economics
Bitcoin Echo ChamberInterviews with Bitcoiners
Bitcoin MattersConversations with @Beautyon_
TFTC21Tales from the crypt
Bottomshelf BitcoinPutting Bitcoin within everyone’s reach
BlockdigestCasual bitcoin news podcast
Citizen BitcoinInterviews with Bitcoiners
NodedMichael Goldstein and Pierre Rochard
Reckless ReviewLawrence Nahum & Udi Wertheimer
Bitcoin KnowledgeInterviews by Trace Mayer
CryptoconomyNarrations of the best bitcoin articles

Did we miss something? Feel free to get in touch!