Adolescents with an ADHD diagnosis (confirmed via Duke's electronic health record or an external documentation of a diagnosis) seeking treatment at the Duke ADHD Program will be recruited. They will be randomized 1:1 to OST or MBI, which are both treatments that are offered as standard clinical care, billable treatments at the Duke ADHD Program. Adolescents and their caregivers will complete rating scales at pre-treatment and post-treatment remotely via Research Electronic Data Capture.

Both treatments are eight 90 minute sessions and are offered as billable services by the Duke ADHD Program as a standard of care.

Adolescents with an ADHD diagnosis (confirmed via Duke's electronic health record or an external documentation of a diagnosis) seeking treatment at the Duke ADHD Program will be recruited. They will be randomized 1:1 to OST or MBI, which are both treatments that are offered as standard clinical care, billable treatments at the Duke ADHD Program. Adolescents and their caregivers will complete rating scales at pre-treatment and post-treatment remotely via Research Electronic Data Capture.

Both treatments are eight 90 minute sessions and are offered as billable services by the Duke ADHD Program as a standard of care.

MBI is a treatment offered as standard clinical care, billable treatments at the Duke ADHD Program. There are eight 90 minute long sessions.

Measured using the Conners 3 self and parent reports from the pre- and post- treatment questionnaires. Participants will rate several statements using a scale ranging from 0 to 3 (from Not True at All to Very Much True). Higher scores indicate more behavioral, emotional, or ADHD-related concerns.

Measured using the Impairment Rating Scale [IRS]: self and parent reports from the pre-and post-treatment questionnaires. Each item rated 0-6; total or mean scores vary by scoring method, with higher scores indicating greater functional impairment.

Measured using Behavior Rating Inventory of Executive Functioning [BRIEF-2]: parent report from pre-and post-treatment questionnaires. Participants will rate several behaviors on a scale of 1-3 depending how often that behavior occurs. Higher scores indicate higher executive functioning difficulties.

Measured using Difficulties in Emotion Regulation Scale [DERS]: self and parent reports from pre-and post-treatment questionnaires. Each item on the DERS is rated using a 5-point Likert scale, with higher scores indicating greater difficulties with emotional regulation.

Measured using the Five Facet Mindfulness Questionnaire [FFMQ]: self report given during the pre-and post-treatment questionnaires. Each item on the FFMQ is rated using a 5-point Likert scale, with a higher total score indicating greater mindfulness.