Jenner, 29, has previously appeared on the shows "The Hills" and "Bromance." He is the son of Olympian Bruce Jenner and beauty pageant queen Linda Thompson, the stepson of businesswoman Kris Jenner and stepbrother of the Kardashian sisters.
Although Brody Jenner has been seen on "Keeping Up with the Kardashians" before, he is expected to have a bigger role in future episodes.
His publicist told UsMagazine.com he "is joining the show but may not be in every episode. It depends on the storyline."
Season 8 of "Keeping Up with the Kardashians" is to premiere on E! in July.