Question: I would like to convert 100+ RTF files to Wiki Markup, but I can only find "Wiki to RTF" converters on the web and even here on StackOverflow.

I only need **RTF --> Wiki Markup**

Is there anything like this out there?

Answer: 
I simply asked the *wrong* question.

Did some research and found out that there is no Converter which converts **RTF** directly to a "**Wiki** format".

The "better" question: *Save Word file as Wiki markup*.

There are some approaches using **Microsoft Word** to save as .txt (Wiki markup):

* <http://www.mediawiki.org/wiki/Extension:Word2MediaWikiPlus>
* <http://www.microsoft.com/en-us/download/details.aspx?id=12298>
* <http://techwiki.openstructs.org/index.php/Wiki_converters>
* <http://www.consumingexperience.com/2008/03/convert-word-doc-or-webpage-to-wiki.html>

Good luck!
It may be unwieldy with hundreds of files, but I have used wikEd to convert RTF and Word formatted text to wiki markup.

Wikedbox is a usable implementation of wikEd without installing it:
<http://www.appropedia.org/index.php?title=Appropedia:Wikedbox&action=edit>

'''Wikedbox HELPS YOU CONVERT HTML (WEB FORMATTED CONTENT) TO MEDIAWIKI.'''. More instructions at [[Appropedia:WikEd]].

INSTRUCTIONS:

1. If you're not in edit mode, click the "edit" tab now.
2. Paste in your content.
3. Click the red [W] to convert. (Middle row, second block from the left.)
4. Your text is ready to be copied and used on your wiki page. (You may need to make further corrections.)
5. '''DO NOT SAVE THIS PAGE'''. (You'll be blocked from doing so, anyway, unless you're an admin.)