Is there a way to prevent iTunes from renaming TV Show filenames?
If you don't want iTunes to manage your files at all then go to:
iTunes &gt; Preferences &gt; Advanced, and uncheck the Keep iTunes Media Folder Organised checkbox.

Alternatively, iTunes uses each item's Title to rename the file, so if you edit the info of a file within iTunes (CMD + I) you can set the title to something to your liking such as &lt;show name&gt; &lt;season no.&gt;&lt;episode no.&gt; e.g. Silicon Valley S03E01.