This study examines the efficacy of a parenting training (Workplace Triple P (WPTP)) especially designed for the needs of employed parents. The program aims to reduce stress at the work–parenting interface by targeting family risk and protective factors and assisting parents to manage competing work and family demands. Ninety-seven part- and full-time working parents (74 mothers and 23 fathers; intervention group: n = 42 parents; waitlist-control group n = 55 parents) from multiple organizations and multiple occupations with children between 2 and 10 years were randomly assigned to an intervention and a waitlist-control condition. After the training, parents from the intervention condition, compared to those from the waitlist-control condition, reported a significant reduction in individual and work-related stress. Additionally, they reported a significant reduction in dysfunctional parenting and significant higher levels of parental and occupational self-efficacy. Within the intervention condition all effects were maintained at the 3- and 6-month follow-up examinations. The findings support the notion that WPTP promotes parental well-being and reduces stress at the work–parenting interface. Given that strengthening parenting skills has the potential to strengthen work, strategies to implement WPTP in organizational resources and community-based services are discussed. Copyright © 2010 John Wiley & Sons, Ltd.