Perinatal stroke causes most hemiparetic cerebral palsy and a lifetime of disability with no known prevention strategies. Two types of perinatal stroke predominate, arterial ischemic stroke (AIS) and periventricular venous infarction (PVI), dictating lesion-specific differences in outcomes. Executive functioning challenges and attention deficit hyperactivity disorder (ADHD) are more common in children with perinatal stroke (19-35%) than peers (5-7%). Resting state (RS) functional magnetic resonance imaging (fMRI) measures fluctuations in the blood-oxygen level dependent (BOLD) signal that may estimate network functional connectivity (FC). We evaluated relationships between FC in relevant frontal circuits, ADHD and executive function in children with perinatal stroke compared to typically developing controls (TDC). Participant recruitment was from a population-based research cohort (AIS N=32; PVI N=30; TDC N=59). MRI imaging included T1-weighted anatomical and resting state fMRI sequences. Subsequent seed-to-seed analyses quantified FC within frontoparietal (FPN), dorsal attention (DAN) and default mode networks (DMN). Parent questionnaires quantified executive function (Behavior Rating Inventory of Executive Function (BRIEF)) and ADHD symptoms (ADHD Rating Scale-5). Large group FC differences were observed within FPN, DAN and DMN networks where AIS had lower FC compared to both PVI and TDC. For stroke participants, higher FC within the DAN and FPN was associated with poorer cognitive function (BRIEF). By contrast, higher FC within the DMN was associated with better ADHD ratings. Differences within frontal functional networks appear to be related to poorer cognitive function such that increased FC between the lesioned and nonlesioned hemisphere is associated with symptoms of executive dysfunction and ADHD suggesting that developmental plasticity leads to complex network changes following early unilateral brain injury.