Copyright: the magnus archives
An award-winning British horror anthology podcast about a fictional British paranormal agency known as the Magnus Institute and the misadventures of its Head Archivist (played by Jonathan Sims). It ran from March 2016 to March 2021, lasting 5 series and 200 episodes total.
A successor series, The Magnus Protocol, was announced to be in production in October 2022.
Episodes can be listened to here.
Compare with SCP Foundation and The Twilight Zone.