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Background: Children with attention-deficit/hyperactivity disorder (ADHD) often overestimate their competence when completing tasks resulting in delays in learning new content. The positive illusory bias (PIB) among children with ADHD has been found in human performance domains but has not been assessed in the motor domain. Children formulate their perceptions of competence from a variety of sources of competence information (SCI). Aims: The purpose of this article was to test for the presence of motor domain PIB and sources of competence information between a sample of children with and without ADHD. Methods and procedures: The PSPPCCMMR, TGMD-2, and PCIS were administered. Outcomes and results: Significant group differences in actual locomotor (t(1, 78) = 23.47, p < .01, d = .56), actual object control (t(1, 78) = 15.82, p < .01, d = .57), and perceived locomotor skills (t(1, 78) = 5.4, p = .03, d = .44) were observed, indicating PIB. The ADHD group also reported higher SCI (t(78) = 2.91, p = .01, ES = .65). Conclusions and implications: Results indicated evidence of motor domain PIB in children with ADHD. The ADHD group did not utilize self-referenced criteria as much as the control group. [ABSTRACT FROM AUTHOR]