Helga Cecilia Forss, also known as Cissi Forss, (born 12 June 1985) is a Swedish actress and comedian. Her breakthrough role was Jennifer in the 2010 film Simple Simon and Cindy in the ICA commercials. When she was nine, Forss participated in a segment of Trafikmagasinet on SVT. Her film debut was in Maria Blom's 2004 film Masjävlar. Forss joined Nour El-Refai in the hidden camera show Raj Raj broadcast on TV400. She also worked with El-Refai, Johan Matton, Björn Gustafsson, and Peter Settman in the TV3 comedy show Hus i helvete. With El-Refai and Maud Lindström, she has written and performed the act "Almost Like Boys" at Riksteatern in 2008, a comedy act about gender. Forss has also appeared in Henrik Schyffert's comedy series Sverige pussas och kramas on Kanal5. In summer 2009, she also participated in Kanal5 series Balls of Steel.
In 2008 she participated in the game show Brain Wall, teaming up with El-Refai and Grete Havnesköld. In 2009 Forss participated in the Sveriges Radio comedy show Kungen kommer till Rissne. With Martin Soneby, she presented the show Silent Library on Kanal5. In 2008 she became known for her role as Cindy in the ICA commercials. In 2010 she starred as Jennifer in the film Simple Simon with Bill Skarsgård, earning her a Guldbagge nomination for supporting actress in a feature film. In August 2011 she was a "Sommarpratare" in Sommar i P1 on Sveriges Radio.
Forss was a sidekick to Pär Lernström in Idol 2011 on TV4. Since 2012 she has been a goodwill ambassador for the Child Cancer Foundation.
In 2013 she participated in the play De 39 Stegen at Intiman in Stockholm.