How many philosophy podcasts are there?

At least 60
Over 80
At least 90 [as of 12/14/20] and they take a variety of forms.

Andrew Lavin (CSU Chico, Butte College, Feather River College), himself the host of the podcast Reductio, compiled a list of them, below:

• 5 Questions (interviews about philosophers themselves w/ Kieran Setiya)
• 80,000 Hours (interviews & conversations w/ Rob Wiblin, Arden Kohler & Ben Todd)
• After Dinner Conversation (philosophical stories & discussion w/ Kolby Granville)
• Always Already (discussions & interviews w/ B Aultman, Rachel Brown, Emily Crandall, John McMahon, & James Padilioni, Jr.)
• Annares Project for Alternative Futures (interviews & conversations w/Joseph Orosco)
• Armchair Opinions (interviews w/ James Brown, Carl Messenger, & Alex Impey)
• Bad Philosophy (conversations w/ Stephen Torrence & Kevin Saunders)
• The Big Idea (interviews w/ David Edmonds)
• Black Mirror Reflections (conversations w/ Leigh M. Johnson & guests)
• Brain in a Vat  (interviews w/ Jason Werbeloff & Mark Oppenheimer)
  
• Can You Phil It? (interdisciplinary philosophical explorations w/ Jeanne Proust)
• Common Room Philosophy (conversations w/ Warwick Philosophy Department)
• Consciousness Live! (interviews w/ Richard Brown)
• Cows in the Field (discussions w/Justin Khoo)
• Les Chemins de la philosophie (interviews, discussions w/ Adèle Van Reeth (in French))
• The Dawdler’s Philosophy (discussions w/ Harland Grant & RTP McKenna)
• Dilemma (interviews, discussiosn w/ Jay Shapiro)
• The Dissenter (interviews w/ Ricardo Lopes)
• El barril de Diógenes (conversation about great philosophical works w/ different professors of the Universidad de los Andes, Chile)
• Elucidations (interviews w/ Matt Teichman et al.)
• Embrace the Void (conversations w/ Aaron Rabinowitz)
• Ethical Theory Review (interviews w/ Bradford Cokelet)
• Ethics in Action (conversations w/ Nir Eisikovits)
• Examining Ethics (interviews w/ Christiane Wisehart & Eleanor Price)
• Five Minute Philosophy (monologues w/Lottie Pike)
• For The Love of Sophia! (conversations with Giuseppe Rotolo and Anthony Celi)
• Forum for Philosophy Podcast (monologues)
• Free Will Matters (edited interlaced interviews w/ Santiago Amaya)
• The Free Will Show (interviews w/ Taylor Cyr & Matt Flummer)
• Futuremakers (conversations w/ Peter Millican)
• Generous Questions (interviews w/ Joe Morrison)
• Getting Ethics to Work (interviews and discussion w/ Andy Cullison and Kate Berry
• Hi-Phi Nation (edited narratives w/ Barry Lam)
• The History of Indian and Africana Philosophy (mix of monologues and interviews w/ Peter Adamson)
• The History of Philosophy without any Gaps (mix of monologues and interviews w/ Peter Adamson)
• In Our Time (conversations and interviews w/ Melvyn Bragg)
• I Think Therefore I Fan (conversation and interviews w/ Rachel Robison-Greene and Richard Greene)
• Journal Entries (interviews w/ Wesley Buckwalter)
• Larger, Freer, More Loving (interviews and conversations w/ Matt LaVine & Dwight K. Lewis Jr.)
• Little Bad Thing (narrative and discussion w/ Eleanor Gordon-Smith)
• London Philosophy Talk (interviews w/ Florian Steinberger)
• The Meaning of… (conversations w/ Tim Dean & Monty Badami)
• Micro-Digressions: A Philosophy Podcast (conversations w/ Spencer Case)
• The Morality of Everyday Things (discussion w/  Anthony Collias and Jacob Wedderburn-Day)
• Natural Philosophers (interview w/ Siddharth Krishnan)
• New Books in Philosophy (interviews w/ Carrie Figdor, Alexus McLeod, Marshall Poe, & Robert Talisse)
• New Narratives in the History of Philosophy (interviews w/ various interviewers)
• The New Thinkery (conversations w/ Gregory McBrayer, Alex Priou, & David Bahr)
• Non sequitur (monologues w/ Diego Castro)
• Nous (interviews w/ Ilan Goodman)
• Open Questions (interviews w/ Jeremy Davis)
• Out of the Tower (interviews w/ Peter O’Meara)
• Out of the Vat (interviews w/ LSE Philosophy department)
• Overthink (conversations, interviews w/ Ellie Anderson & David M. Peña-Guzmán)
• Pandemic Ethics (interview w/ Joshua Preiss)
• The Panpsycast (conversations w/  Jack Symes, Gregory Miller, Andrew Horton, Oliver Marley, et al.)
• Partially Examined Life (“reading group” discussions w/ Mark Linsenmayer, Seth Paskin, Wes Alwan, & Dylan Casey)
• The Philosopher’s Guide to Conspiracy (conversations and interviews w/ M R. X. Dentith and Josh Addison)
• Philosophers in Space (conversations about philosophy and movies/TV w/ Aaron Rabinowitz & Thomas Smith)
• Philosophers On Medicine (interviews w/ Jonathan Fuller)
• The Philosopher’s Zone (interviews w/ David Rutledge (ABC Radio))
• Philosophical Disquisitions (interviews w/ John Danaher)
• Philosophical Trials (interviews w/ Tedy Nenu)
• Philosophize This (monologues w/ Stephen West)
• Philosophy 24/7 (interviews w/ David Edmonds)
• Philosophy and Film (interview/discussion with Joe Saunders, Hyde Park Picture House)
• Philosophy Bakes Bread (interviews w/ Eric Thomas Weber & Anthony Cashio)
• Philosophy Bites (short interviews w/ David Edmonds & Nigel Warburton)
• Philosophy for Our Times (conversations w/ iai Podcasts)
• Philosophy In Film (conversations w/ Chris McTavish & Alain Beauclair)
• Philosophy Talk (conversations w/ Stanford Faculty incl. John Perry, formerly Ken Taylor, Ray Briggs, Debra Satz, Josh Landy, et al.)
• Philosophy? WTF?? (conversations w/ Danny O’Donnell & Michael Alsford)
• Plato’s Cave (interviews w/ Jordan Myers)
• A Pod Called Quest  (conversation with Derrick Darby and Christian Davenport)
• Political Philosophy Podcast (interviews w/ Tobias Buckle)
• Premise (interviews w/ Angelos Sofocleous)
• Proceedings of the Aristotelian Society (lectures)
• Reductio (edited narratives w/ Andrew Lavin)
• Sacred and Profane Love (interviews w/ Jennifer Frey)
• SCI PHI (interviews w/ Nick Zautra)
• Searching for It (Monologue and Interview w/ Lewis Williams)
• She Speaks (interviews w/ Saba Fatima)
• Short and Curly (ethics podcast for kids w/ ABC Radio)
• Sophia (interviews w/ Dan Kaufman)
• The Stoa (interviews & discussions w/ Peter Limberg)
• Stoic Meditations (monologues w/ Massimo Pigliucci)
• Sutras and Stuff (monologues and interviews w/ Malcolm Keating)
• Thinking Out Loud (interviews w/ Katrien Devolder)
• Unmute (interviews w/ Myisha Cherry)
• Upon Reflection (monologues w/ Nick Byrd)
• Very Bad Wizards (conversations w/ Tamler Sommers & David Pizarro)
• Why? Philosophical Discussions about Everyday Life (discussions w/ Jack Russell Weinsstein)
• Why Theory (conversations w/ Todd McGowan & Ryan Engley)
• Wisdom at Work (interviews w/ David E. Storey)

Dr. Lavin knows that he may have missed some, so podcasters are encouraged to  e-mail him at [email protected] to join the list, and we’ll update it. Feel free, as well, to mention any additions to the list in the comments, including hosts’ names and the kind of podcast it is.

(Revisions will be made to the list on an ongoing basis, typically without a major announcement of an update.)

See also Kelly Truelove’s list of philosophy and ideas podcasts, philosophy podcasters on Twitter and his TrueSciPhi radio (an internet radio station streaming participating philosophy & ideas podcasts).