Lena Dunham (/ˈliːnə ˈdʌnəm/; born May 13, 1986) is an American writer, director, actress, and producer. She is the creator, writer, and star of the HBO television series Girls (2012–2017), for which she received several Emmy Award nominations and two Golden Globe Awards. Dunham also directed several episodes of Girls and became the first woman to win the Directors Guild of America Award for Outstanding Directing – Comedy Series. She started her career writing, directing, and starring in her semi-autobiographical independent film Tiny Furniture (2010), for which she won an Independent Spirit Award for Best First Screenplay. She has since written and directed the 2022 films Sharp Stick and Catherine Called Birdy. In 2025, she created the Netflix series ‘Too Much’ starring Megan Statler.

In 2013, Dunham was included in the annual Time 100 list of the most influential people in the world. In 2014, Dunham released her first book, Not That Kind of Girl: A Young Woman Tells You What She's "Learned". In 2015, along with Girls showrunner Jenni Konner, Dunham created the publication Lenny Letter, a feminist online newsletter. The publication ran for three years before its discontinuation in late 2018.

Dunham briefly appeared in films such as Supporting Characters and This Is 40 (both 2012), and Happy Christmas (2014). She voiced Mary in the 2016 film My Entire High School Sinking Into the Sea, which premiered at the Toronto International Film Festival. On television, aside from Girls, she has played guest roles in Scandal and The Simpsons (both 2015). In 2017, she portrayed Valerie Solanas in American Horror Story: Cult.

Dunham's work, as well as her outspoken presence on social media and in interviews, have attracted significant controversy, praise, criticism, and media scrutiny throughout her career.

Dunham was born in New York City. Her father, Carroll Dunham, is a painter, and her mother, Laurie Simmons, is an artist and photographer, and a member of The Pictures Generation, known for her use of dolls and dollhouse furniture in her photographs of setup interior scenes. Her father is Protestant of mostly English ancestry; her mother is Jewish. Dunham has described herself as feeling "very culturally Jewish, although that's the biggest cliché for a Jewish woman to say." The Modern Hebrew poetry of Yehuda Amichai helped her to connect with her Judaism.

Dunham attended Friends Seminary before transferring in seventh grade to Saint Ann's School in Brooklyn, where she met Tiny Furniture actress and future Girls co-star Jemima Kirke. As a teen, Dunham also won a Scholastic Art and Writing Award. She attended The New School for a year before transferring to Oberlin College, where she graduated in 2008 with a degree in creative writing.

She has a younger sibling, Cyrus, a 2014 graduate of Brown University, who appeared in Dunham's first film, Creative Nonfiction, and starred in her second film, Tiny Furniture. The siblings were raised in Brooklyn and spent summers in Salisbury, Connecticut.

While a student at Oberlin College, Dunham produced several independent short films and uploaded them to YouTube. Many of her early films dealt with themes of sexual enlightenment and were produced in a mumblecore filmmaking style, a dialogue-heavy style in which young people talk about their personal relationships. In 2006, she produced Pressure, in which a girl and two friends talk about experiencing an orgasm for the first time, which makes Dunham's character feel pressured to do so as well. "I didn't go to film school", Dunham explains. "Instead I went to liberal arts school and self-imposed a curriculum of creating tiny flawed video sketches, brief meditations on comic conundrums, and slapping them on the Internet."