Isabella Khair Hadid (/həˈdiːd/ hə-DEED; born October 9, 1996) is an American model. Hadid has made 35 appearances on international Vogue covers. In 2022, she was named Model of the Year by the British Fashion Council. Time magazine named her one of the 100 most influential people in the world on its annual list in 2023.

Born in Washington, D.C., and raised in Santa Barbara, California, Hadid began her modeling career aged 16. She was signed to IMG Models in August 2014, and made her New York Fashion Week debut the following month. In 2016, she was voted "Model of the Year" by industry professionals for Models.com. In 2017, Hadid broke Doutzen Kroes's record for the most Vogue September covers in one year by appearing in five international editions. As of 2023^[update], Hadid was one of the world's highest paid models, earning $19 million.

Hadid was born on October 9, 1996, in Washington, D.C. Her father, Mohamed Hadid, is a Palestinian-American real estate developer, while her mother, Yolanda Hadid (née van den Herik), is a Dutch former model. Through her father, Hadid claims descent from Zahir al-Umar, ruler of northern Palestine in the mid-18th century. She has an older sister, Gigi Hadid, and a younger brother, both of whom are also models. She also has two older paternal half-sisters. In May 2025, Hadid and her sister Gigi announced in a statement that they have a younger half sister through their father named Aydan Nix. They shared that they connected with Nix in late 2023. Nix was welcomed by her mother, Terri Hatfield Dull, after a brief relationship with Mohamed that came after his divorce from Yolanda. Hadid and her siblings were raised on a ranch in Santa Barbara, California. The family moved to Beverly Hills after ten years. Hadid's childhood home was destroyed in January 2025 due to the series of wildfires in Southern California.

As a teenager, Hadid was an equestrian and dreamed of competing at the 2016 Summer Olympics, although she competed in equitation, which is not an Olympic discipline. She was diagnosed, along with her mother and brother, with chronic Lyme disease in 2012. During her high school years, Hadid experienced difficulties with inattention and was diagnosed with attention deficit hyperactivity disorder. She was prescribed Adderall, but subsequently developed anorexia as a result of the appetite suppressant.

After graduating from Malibu High School in 2014, Hadid moved to New York City to study photography at the Parsons School of Design. She suspended her studies to focus on her modeling career, but has expressed an interest in returning to school once she was done modeling to branch out into fashion photography.

Hadid's modeling career began when she was sixteen years old with a commercial project for Flynn Skye. She also appeared in modeling projects such as Lesa Amoore's "The Swan Settings", alongside actor Ben Barnes, and Holly Copeland's "Smoking Hot". Hadid also modeled for Hanna Hayes' Fall/Winter 2013 Collection, and did campaign work for Chrome Hearts, the family brand^{[clarification needed]} of her best friend, Jesse Jo Stark.

Hadid signed to IMG Models on August 21, 2014. She made her New York Fashion Week debut in September, walking for Desigual. In December, Hadid made her first cover appearance on Jalouse, and was featured on day 27 of Love magazine's Love Advent Calendar.

In February 2015, Hadid made her runway debut, walking for Tom Ford's Fall/Winter 2015 collection. In April, she was featured in two editions of Carine Roitfeld's CR Fashion Book – "Body By Bella" and "Fantasy Campaigns". In May, she walked for amfAR's 22nd Cinema Against AIDS Gala.