ABSTRACT Background Behavioral Parent Training (BPT) is a widely implemented evidence-based treatment for youth with Attention-Deficit/Hyperactivity Disorder (ADHD) and related behavioral problems. During the COVID-19 pandemic, BPT was rapidly scaled for remote delivery via video conferencing platforms to enhance reach and engagement among families in need. Objective The purpose of the present study was to conduct a randomized controlled trial of a remotely delivered group-based BPT implemented in tandem with the Summer Treatment Program (STP) during the summer of 2021, the first year our clinic returned to in-person services following initial pandemic-related lockdowns. Method Children ranged in age from 6 to 12 years (M = 8.23, SD = 1.51) and were primarily male (93%) and Hispanic/Latine (74.4%). Families were randomly assigned to either receive the virtually delivered BPT during the summer (N = 23) or to a wait-list control group (N = 20), who received virtually delivered BPT in the fall. Results All families reported significant improvements in ADHD symptoms, related impairments, negative parenting behaviors, and knowledge of effective parenting skills from pre- to post-STP. Parents in the BPT group demonstrated additional improvements in managing difficult home situations. Conclusions Results of the study suggest that participating in BPT alongside the STP produces unique benefits for families above the standard behavioral treatment. Additionally, this study demonstrates the feasibility and utility of virtual group-based BPT to reduce burden associated with in-person services while providing evidence-based care in an inclusive manner.