Siri Helle (b. 1991) is an award-winning psychologist and bestselling author. With a background as a clinical therapist, she has worked with CBT-treatment for depression, stress, and anxiety. She is now an appreciated expert in business and media, popularizing psychological knowledge.

Helle is the spokesperson for the policy campaign 'Mental Health on the Curriculum', a coalition of 30 non-governmental organisations such as UNICEF Sweden, to improve mental health education in schools.

As an ambassador for effective givning, Helle donates 10 percent of her royalties to effective charity through GiveWell.org.