Louisa Jacobson Gummer (born June 12, 1991) is an American actress. A daughter of actress Meryl Streep, she graduated from the Yale School of Drama with an MFA in acting. She is known for starring in the HBO period drama series The Gilded Age (2022–present).

Jacobson was born in Los Angeles, California, on June 12, 1991,^[1] to actress Meryl Streep and sculptor Don Gummer.^[2][3] She is the younger sister of musician Henry Gummer and actresses Mamie Gummer and Grace Gummer. She attended Poly Prep Country Day School and graduated from Vassar College in 2013 majoring in psychology. She also attended British American Drama Academy three-week summer programme in Oxford and is a graduate of the Yale School of Drama with a master of fine arts in acting.^[4][5][6][7]

She uses the surname Jacobson, which is her middle name, as there already is an actress named Louisa Gummer,^[8] and the Screen Actors Guild (SAG) requires that 'no member use a professional name which is the same as, or resembles so closely as to tend to be confused with the name of any other member'.^[9]

On stage, Jacobson made her professional acting debut as Mary Dalton in Yale Repertory Theatre’s production of Nambi E. Kelley’s Native Son, directed by Seret Scott in 2017. The following year she starred in Williamstown Theatre Festival’s production of Carson McCullers’ play Member of the Wedding (2018), opposite Tavi Gevinson and directed by Gaye Taylor Upchurch. In 2019, she starred as Juliet in The Old Globe’s production of Romeo and Juliet.^[10] The Times of San Diego praised her performance writing, "Jacobson has the pulsating impetuosity of a teenager...Her profligate joy in love and unchecked anguish in bereavement are palpable, visceral".^[11]

In 2022 she acted in the Lindsay Joelle play Trayf at the Geffen Playhouse. Though only in one scene, critics praised her for stealing the show. Maureen Lee Lenker of Entertainment Weekly wrote, "Jacobson makes a meal of her featured role" and that "She's heartbreaking in her single scene, confronting Shmuel about the constraints of their religion."^[12] Also in 2022, she made her television debut starring in Julian Fellowes' HBO period drama series The Gilded Age acting opposite Carrie Coon, Christine Baranski, Cynthia Nixon and Denée Benton.^[13] In 2023 she was nominated alongside the cast for the Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series.