There is no health without mental health, and there is no well-being without a healthy mind. Effective Altruists have tended to focus on health interventions, because they are easily quantifiable -- but we have to consider how it translates into improved well-being. Mental health interventions affect well-being directly, but are mostly expensive and hard to scale. In this workshop, we will explore promising new areas of research towards scalable solutions for mental health, discuss startups that are tackling this problem, and break off into small groups to brainstorm how EA's can contribute.