Jazz Jennings (born October 6, 2000) is an American YouTube personality, spokesmodel, television personality, and LGBT rights activist. Jennings is one of the youngest publicly documented people to be identified as transgender. Jennings received national attention in 2007 when an interview with Barbara Walters aired on 20/20, which led to other high-profile interviews and appearances. Christine Connelly, a member of the board of directors for the Boston Alliance of Gay, Lesbian, Bisexual, and Transgender Youth, stated, "She was the first young person who picked up the national spotlight, went on TV and was able to articulate her perspective and point of view with such innocence." Her parents noted that Jennings was clear on being female as soon as she could speak.

Jennings is an honorary co-founder of the TransKids Purple Rainbow Foundation, which her parents founded in 2007 to assist transgender youth. In 2013, she founded Purple Rainbow Tails, a company in which she fashions rubber mermaid tails to raise money for transgender children. Jennings hosts a series of YouTube videos about her life, titled "I Am Jazz". She stars in the TLC reality TV series, I Am Jazz, which premiered in 2015 and focuses on her daily life with her family and the challenges she faces as a transgender person.