I'm having a bad time trying to delete a subscribed calendar. I am running OSX 10.8.4 on my iMac and IOS 6 on iPhone and iPad. Whenever I delete this calendar it reappears, usually within a few seconds. I have tried deleting from each device and from iCloud, without success. Any thoughts or suggestions would be most welcome.
Assuming you use iCal (not specified in your question), then the Subscribed calender should appear under subscriptions.
UN-checking them will stop showing them.
If you trying to completely remove them then Right Click on the calender and Delete in the Pop up.
If above fails lets do the "brutal" method:
Launch iCal and test.
If the issue still persists at this point:
Remove the following to the trash and restart your computer:
---NOTE: Removing these files may remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.
I was having this same problem getting rid of old calendars. They kept popping back on. I figured that all of my electronics were back feeding each other. I got the iCloud calendar on my monitor, the calendars on my laptop, iPad and phone all displayed. Then I deleted one calendar from each of them as fast as I could. Then I took the next one and deleted it in sequence as fast as I could. They are gone and have not reappeared. I hope this works for others.