I've wondered this as well. Eliezer seems to think it is, as it's listed when one of the characters (I forget who) enumerates means of mind control including Imperius and the Confundus Charm. Possibly it's fanon?
The Potter Wiki cites Voldemort using Legilimency to send Harry visions and briefly possess him, though their connection seems like it ought to be a fairly unique case.
In HPMoR, at least, Moody was able to "reshape Harry to make him believe he was on fire", which implies Legilimency is more than just passive mind-reading.
New chapter!
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 104.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: