Objective: This research aimed to examine the impact of attention deficit disorder (ADD)/ADHD in children on parental labor force participation across different child age groups. Method: This study utilized a longitudinal, quantitative analyses approach. All data were collected from Wave 6 of the Growing Up in Australia: The Longitudinal Study of Australian Children (LSAC) survey. Results: After adjusting for various confounders, mothers whose children were 10/11 years old and had been diagnosed with ADD/ADHD were significantly more likely to be out of the labor force compared with those mothers whose child had not been diagnosed with ADD/ADHD. The impact was more pronounced for single mothers. No significant influence on paternal labor force participation was found. Conclusion: In assessing the cost-effectiveness of interventions for ADD/ADHD, policy makers and researchers must consider the long-term social and economic effects of ADD/ADHD on maternal workforce participation when considering costs and outcomes.