Emerging research suggests overrepresentation of gender diversity among autistic youth. Previous gender diversity research with autistic children has relied on parent-report based on a single question. The "Gender Diversity Screening Questionnaire--Self-Report and Parent-Report" assessed gender diversity experiences from 244 children (140 autism spectrum disorder and 104 typically developing), between 10 and 13 years, and their parents. Parent-report "Child Behavior Checklist" Item-110, "Wishes to be the opposite sex," was also collected. Autistic children endorsed higher Gender Diversity Screening Questionnaire--Self-Report Binary Gender Diversity, t(223.21) = -2.83, adjusted p = 0.02, d = -0.35, and Nonbinary Gender Diversity, t(191.15) = -3.79, adjusted p = 0.001, d = -0.46, than typically developing children. Similarly, for Gender Diversity Screening Questionnaire--Parent-Report, there was a significant gender-body incongruence difference between the groups, t(189.59) = -2.28, adjusted p = 0.05, d = -0.30. Within-group analyses revealed that parents of autistic females-assigned-at-birth reported significantly more gender-body incongruence than males-assigned-at-birth, t(32.91) = -3.78, p < 0.001, d = -1.11. Moreover, distinct within-group profiles of gender experiences and internalizing symptoms were revealed, showing associations between gender profiles and symptoms of anxiety, depression, and suicidality. Results extend reports showing increased rates of gender diversity in autistic children based on both self-report and parent-report, underscoring the need to better understand and support the unique and complex needs of autistic children who experience gender diversity.