Background: Long-term outcomes are of particular importance in evaluating interventions for family caregivers of people with dementia (PwD). So far, evidence for long-term effects (>6 months postintervention) is limited to four interventions. Objective: We examined the long-term effects of Tele.TAnDem, a telephone-based cognitive-behavioral therapy (CBT) intervention, on a variety of outcomes at 3-year follow-up, the longest follow-up of any intervention study for caregivers of PwD (without continuous support).