The purpose of the study is to assess the hypothesis that achievement goal orientations will predict sportpersonship attitudes among young athletes, namely that task orientation will predict socially positive attitudes and ego orientation will predict socially negative attitudes. For hundred and eighty two athletes, aged 13 to 16 years completed the Portuguese versions of the Task and Ego Orientation in Sport Questionnaire (TEOSQp) and of the Sports Attitudes Questionnaire (SAQp). Bivariate correlations were used to examine the relationships between TEOSQp and SAQp. Afterwards, relationships between ego orientation and score agreement in cheating and gamesmanship as well as task orientation and score agreement in convention and commitment were examined through EQS (version 5.7). For the estimation of the model, the maximum likelihood method was used. A matrix correlation between the variables (task orientation, ego orientation, cheating, gamesmanship, convention and commitment) showed positive correlations between task orientation and convention (r = 0.29, p < 0.01) and commitment (r = 0. 40, p < 0.01). Ego orientation appeared to be positively correlated with cheating (r = 0.30, p < 0.01) and gamesmanship (r = 0.33, p < 0.01), and negatively with convention (r = -0.16, p < 0.01).The fit of the model was evaluated using the CFI (0.97) and SRMR (0.04). The hypothesized model was confirmed. Task and ego orientations produced a significant effect on prosocial attitudes and on antisocial attitudes, respectively. Task-oriented goals in youth sport programs can represent a relevant framework for promoting prosocial attitudes and consequentely increment the effectiveness of educational interventions.

• Sport seems to be an important component of daily physical activity in children and adolescents and its importance is often viewed as positive.

• Literature suggests that a high task orientation has a positive link with moral variables and a high ego orientation is likely to promote inappropriate behaviours.

• Task orientation will predict pro-social sport attitudes, and to assess the hypothesis that ego orientation will predict anti-social sport attitudes among young athletes.

• It is possible to suggest a pattern in which the self-referenced achievement goals can promote the expression of sportspersonship attitudes

• Environmental factors can be more influential than dispositional orientations when it comes to sportspersonship.