SYNOPSIS: OBJECTIVE: This study examines links between maternal and paternal ADHD symptoms and parenting practices that require inhibition of impulses, sustained attention, and consistency; the role of home chaos in these associations is also assessed. DESIGN: ADHD symptoms, the level of home chaos, and parenting practices (involvement, inconsistent discipline, supportive and non-supportive responses to children's negative emotions, and positive parenting) were assessed through self-reports of 311 mothers and 149 fathers of middle-childhood children. Child ADHD symptoms were assessed by teachers. RESULTS: Mothers reported higher home chaos when they or their children had higher levels of ADHD symptoms; for fathers, only their own ADHD symptoms predicted higher levels of home chaos. Mothers' ADHD symptoms were positively associated with inconsistent discipline and non-supportive responses to children's negative emotions, and these associations were mediated by home chaos. Higher levels of fathers' ADHD symptoms predicted more inconsistent discipline, low involvement, and a low level of supportive and a high level of non-supportive responses to children's negative emotions. Home chaos moderated the link between paternal ADHD and inconsistent discipline and mediated the link between paternal ADHD and involvement. Overall, positive aspects of parenting, and those that require attention and ability to control one's impulses, may be compromised in fathers with high levels of ADHD symptoms. CONCLUSIONS: Effectiveness of specific parenting practices for both mothers and fathers may be compromised in parents with ADHD symptoms. In certain cases, parental ADHD symptoms translate into ineffective parenting through disorganized homes.