Sofie Katrine Lassen-Kahlke is an Danish actress. She is the daughter of lawyer Niels Kahlke and lawyer Nina Lassen. She first appeared in the comedy Vildbassen in 1994, where she also starred with Robert Hansen for the first time. Since then, the two have starred together in four Anja and Viktor films. Before she got the role in Love at First Hiccup, she took a three-month acting course with Lee Strasberg in Los Angeles. She was discovered by Regner Grasten by chance. Regner Grasten's children went to the same school as Sofie Lassen-Kahlke. She was seen on TV in 1994, when she appeared in Eleva2eren with the song from Krummerne 3 and made her debut on TV in Krummernes jul.

Sofie recently starred in the acclaimed short film Moder from 2025, a powerful and emotionally charged story that explores the often unspoken challenges and emotional complexities of parenting.