Background: The Eating Attitudes Test (EAT) is the most widely used instrument for evaluating eating disorders in adults and adolescents in a variety of cultures and samples. Objective: The aim of this study was to analyse the psychometric properties of the Portuguese version of the Children’s Eating Attitudes Test (ChEAT). Method: Nine hundred and fifty-six Portuguese secondary students (565 girls and 391 boys) answered the ChEAT. The test-retest reliability was obtained with data from 206 participants from the total sample who re-answered the questionnaire after 4-6 weeks. Psychometric analyses were carried out for the total sample and separately for girls and boys. Results: Internal consistency and test-retest reliability were satisfactory. Principal components factorial analysis yielded four factors in the total sample, accounting for 42.35% of the total variance. Factor structure was similar in the total sample and in both genders. Factors were labelled: F1 “Fear of Getting Fat”, F2 “Restrictive and Purgative Behaviours”, F3 “Food Preoccupation” and F4 “Social Pressure to Eat”. The concurrent validity, explored using the Contour Drawing Figure Rating Scale (CDRS) was high. Discussion: The Portuguese version of the ChEAT is a valid and useful instrument for the evaluation of abnormal eating attitudes and behaviours among Portuguese adolescents.