Janet Jackson -- Still Blacklisted from Super Bowl Halftime Show

Apparently, the NFL is still upset with Janet Jackson for that whole nipplegate thing back in 2004 -- because league reps tell us she's still on the blacklist when it comes to the Super Bowl Halftime show.

TMZ Sports reached out to the NFL to discuss possible acts at Super Bowl XLIX (49) in Arizona next year -- and while the league wouldn't say who's in the running, they did issue the following statement:

"As for potential acts --- we have only ruled out Janet Jackson."

No word on how Justin Timberlake escaped the ire of the NFL -- considering he played a key role in the infamous "wardrobe malfunction" that day -- but if he's NOT banned, BOOK HIS ASS!!!

#JT4XLIX