Mia Gypsy Mello da Silva Goth was born October 25, 1993 in Southwark, London, England to a Brazilian mother and a Canadian father. Goth moved to Brazil when she was a few weeks old and returned to Britain when she was five. She later briefly relocated to her father's native Canada when she was ten. Aged twelve, she and her mother settled in south-east London, England, where Goth went to secondary school. Her maternal grandparents are American artist Lee Jaffe and Brazilian actress Maria Gladys.
Aged 14, she was discovered at the Underage Festival in London by fashion photographer Gemma Booth, who signed her to Storm Model Management. She subsequently appeared in advertisements for Vogue and Miu Miu. She began to audition for films at the age of 16, and after finishing sixth form, she won her first role in Lars von Trier's Nymphomaniac and played alongside Willem Dafoe. She later played Sophie Campbell in the Sky Atlantic's crime drama series The Tunnel and appeared in Stephen Fingleto