Janet was mentioned in the season two episode of THE OFFICE called "Take Your Daughter to Work Day"
She was mentioned in an episode of LIZZIE MCGUIRE called "Inner Beauty", and in a season 4 episode of EVERYBODY HATES CHRIS.
Beyonce mentioned Janet in her HBO documentary as one of the women she looked up to as a child
On a Halloween episode of FAMILY MATTERS, Judy Winslow dressed as Janet from the Rhythm Nation video.
Janet was mentioned in the film "Party Monster" by Seth Green and Macaulay Culkin. She was also mentioned in Will Smith's "Enemy of the State" and the movie "Friday", among several others.
Tina Fey posed for a photo on an episode of 30 ROCK in the same pose as Janet's Rolling Stone cover. There was also a painting in the image of the RS cover in an episode of 30 ROCK (Tina Fey is a Janet stan)
Kenny and The Chef from SOUTH PARK were on the cover of SPIN Magazine posing like Janet's RS cover, as was a shirtless Tim Allen on the cover of LAUGH Magazine
Janet was an answer on an episode of JEOPARDY
In the second season of THE SOPRANOS in an episode called "Toodle Fucking-Oo", Tony Soprano is pulling up to a houseparty, trying to find his daughter. One of the daughter's friends is outside, dancing on the street. He says to her: "Hey Janet Jackson..."
On 1 GIRL 5 GAYS, Janet has been mentioned several times, and on Aliyah Jasmine's last episode, panelist Gerry lapdanced AJ to Janet's "Nasty"
Indirectly to FAME, Melissa Etheridge mentioned in her autobiography that she auditioned for a role on the TV show, and the part came down to her and...Janet Jackson. She said she was pretty much in awe at seeing Janet in the same room as her.
KIDS INCORPORATED covered several Janet songs over the years. Here's Martika covering "What Have You Done For Me Lately"