To some extent, body posture reflects the internal state of an animal but it has never been objectively measured in pigs. However,it could be a good indicator and useful in evaluating their welfare; the concept has already been developed for use in horses. Inthis study, we used geometric morphometrics to develop an objective and precise method to analyse the body posture of pigs. Thescience of geometric morphometrics consists of describing shapes of an organism using the coordinates of a series of homologouslandmarks placed on the body. We compared the body posture of 48 growing pigs reared in two conditions: 24 isolated inindividual pens and 24 penned in groups of four. A human caretaker interacted regularly with the pigs, stroking them and talking tothem, in order to facilitate handling. After two weeks, we measured their posture in a testing pen. Based on the morphology of theanimals, we chose seven landmark sites and identified those landmarks with a pencil mark. Two of the landmarks were excludeddue to a lack of reliability in their positioning. Preliminary analyses showed that body posture measures were greatly affected bycurvature of the back and the distance between the scapula and the third rib (P<0.05). Individually penned (“isolated”) animalswere more contracted between the scapula and the third rib than those penned in groups (P<0.05). In conclusion, body posturewas slightly influenced by rearing environment. Improvements in this method are still needed (i.e. number of markers) and furthervalidation is also needed (i.e. effects of different emotional states) but, as an indicator of pig welfare, it does show promise.