Helena Mattsson (born 30 March 1984) is a Swedish actress living and working in Hollywood.
Mattsson was born and raised in Stockholm, Sweden. She began acting at a young age, performing in plays, musicals and concerts. She studied acting at the highly selective Södra Latin upper secondary school in Södermalm, which she credits with giving her the confidence to pursue her chosen career. Mattsson had early roles in Wild Side Story and other cabarets in Stockholm. She moved to London, England, as a teenager to attend theatre school.
At the age of 19, she moved to Hollywood to audition for a TV series. Her planned short visit became permanent after she won a role the short-lived 2004 TV series Sweden, Ohio. Mattsson's accent initially held her back: "When I started working, my thick Swedish accent lost me a lot of roles. A defining point in my career definitely came when I started to lose it. I was able to play more American roles at that point, and my career took a turn for the better."