This study examined the accuracy of self- and other-estimated intelligence in relation to tested cognitive ability and gender. Three groups of raters were examined: 187 (102 male, 85 female; mean age 14.33 years, SD = 0.32) pupils of single-sex comprehensive schools, 109 (55 mothers and 54 fathers) parents, and six teachers of the pupils. Pupils estimated their own overall IQ, while their parents and teachers estimated the pupils' overall, mathematical, spatial, and verbal abilities. Self- and other-estimates were compared to each other, and to the child's psychometric test scores in verbal, quantitative, and figural/non-verbal reasoning ability. Results suggested that participants were reasonably accurate at estimating pupils' intelligence--teachers significantly more so than parents, and pupils significantly more so than fathers. Although both parents significantly overestimated their child's IQ, this overestimation was more pronounced in fathers. (Contains 6 tables and 1 note.)