Brian Michael Firkus (born August 23, 1989), better known by the stage name Trixie Mattel, is an American drag queen, television personality, and singer-songwriter originally from Milwaukee, Wisconsin. She is known for her exaggerated, high-camp, 1960s-influenced style, distinctive eye makeup, and her blend of comedy, acoustic pop, and folk-country music; Mattel sings and plays guitar and the autoharp. In 2015, she competed in the seventh season of the drag reality television competition series RuPaul's Drag Race, placing sixth. In 2018, she went on to win the third season of RuPaul's Drag Race All Stars. She also made guest appearances in various iterations of the Drag Race franchise.

Mattel formed the popular comedy duo known as Trixie and Katya alongside fellow drag queen and frequent collaborator Katya Zamolodchikova. Together, they starred in the World of Wonder web series UNHhhh (2016–present) and its Viceland spin-off The Trixie & Katya Show (2017–2018). The pair also appeared in the Netflix review web series I Like to Watch (2019–present) and the podcast The Bald and the Beautiful (2020–present).

Mattel's music style began as primarily folk and country, with her first and second studio albums, Two Birds (2017) and One Stone (2018), both charting on the Billboard Folk Albums chart at No. 16. She went on to star in the documentary film Trixie Mattel: Moving Parts (2019). Her third studio album, Barbara (2020), featured an "electro-folk" sound, while her EP, Full Coverage, Vol. 1 (2021), consisted of covers of various songs. Her musical comedy special, Trixie Mattel: One Night Only (2020), was nominated for a Critics' Choice Television Award and she appeared as a judge on the competition series Queen of the Universe (2021–2023). Mattel's fourth studio album, The Blonde & Pink Albums (2022), was a double album featuring a "power pop" sound. She also produced and starred in the renovation docuseries Trixie Motel (2022–2024), which chronicled the opening of her own Palm Springs resort of the same name.

Co-published with Zamolodchikova, Mattel's first book, Trixie and Katya's Guide to Modern Womanhood (2020), became a New York Times bestseller. She appeared on New York Magazine's list of "The Most Powerful Drag Queens in America", ranking fourth. She also operates a YouTube channel focused on beauty and music, featuring frequent collaborations with fellow drag queens and various celebrities such as Iggy Azalea, Nicole Byer, Brittany Broski, and Margaret Cho. Mattel's business ventures include being the founder and CEO of Trixie Cosmetics, a cosmetics brand launched in 2019. Her persona is inspired by her love of Barbie dolls; she owns a large collection of Barbies that she has shared in videos on her YouTube channel.