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Background/Objectives: The Positive Parenting Program (Triple P) is an evidence-based intervention for families including young children with neurodevelopmental disorders. Because establishing a definitive diagnosis in early childhood takes time, especially for 1-3-year-olds who have only recently shown early signs, parents often experience substantial stress. This study examines the effectiveness of the Group Triple P (GTP) program for mothers of 1-3-year-old children without a confirmed diagnosis who spent time at a community parenting support center. Methods: The participants were 41 mothers of children aged 1-3 who did not confirmed neurodevelopmental diagnosis but showed behavioral, emotional, or developmental concerns, or whose mothers reported parenting difficulties. To reflect real community practices, a non-randomized pre-post test design without a control group was adopted. Assessments were conducted at baseline, postintervention, and at a 12 weeks follow-up using the Strengths and Difficulties Questionnaire, Parenting Scale, Parenting Experience Scale, and Depression Anxiety Stress Scale. Results: GTP improved the mothers' assessments of positive behaviors in children who may have neurodevelopmental disorders, with a medium effect size. GTP reduced dysfunctional parenting styles in mothers with a large effect size. It also enhanced mothers' confidence and fulfilling sense in parenting, and decreased depression and stress with a medium effect size. Perceived access to parenting support improved, contributing to better parenting adaptation with a medium effect size. Conclusions: GTP may serve as an early public health intervention for mothers of young children who may have neurodevelopmental disorders by supporting maternal mental health and promoting adaptive parenting.