Objective: To test the effects of Life Enhancing Activities for Family Caregivers (LEAF), a 6-week positive emotion regulation intervention, on outcomes of positive emotion, depression, anxiety, and physical health as measured by the Patient-Reported Outcomes Measurement Information System® (PROMIS®). Method: A randomized controlled trial (N 170) comparing LEAF (N 86) to an emotion reporting/waitlist condition (N 84) in dementia caregivers. LEAF was individually delivered online by trained facilitators.