In addition to core reading difficulties, a significant proportion of children with Developmental Dyslexia (DD) present with cognitive deficits outside the scope of reading, evidenced by considerable overlap with other neurodevelopmental disorders, including attention-deficit/hyperactivity disorder (ADHD). We examined if children with DD experience co-occurring ADHD symptoms, and whether there is a subgroup of children with DD who are more likely to experience these symptoms based on the types of reading difficulties they experience. Forty-one children with DD were compared with 24 Age-Matched (AM) and 17 Reading-Matched (RM) controls on the Conners 3 Parent Short-Form. The DD group demonstrated higher levels of inattention and hyperactive/impulsive ADHD symptoms as well as more executive functioning, aggression and learning problems than AM controls, but only higher levels of inattentive symptoms, executive functioning and learning problems than RM controls. Moderation analyses revealed that DD children with relatively worse lexical skills had higher levels of inattention ADHD symptoms and executive functioning problems. These findings suggest that inattention and executive functioning problems co-occur with poor reading in DD, even after reading ability is accounted for, and that children whose DD is characterised by poorer lexical abilities are at greatest risk of experiencing co-occurring ADHD symptoms.