The goal of the present study was to examine size perception of objects depicted stereoscopically. Display size, target size, viewing distance, camera convergence distance, disparity information, and the scene background were manipulated. Subjects estimated the perceived height of a set of stereoscopic targets that were projected from photographic slides. The stereoscopic slides were taken with the targets either in a studio with a black background or outdoors with a backdrop of natural vegetation, using three camera convergence distances. The stereo slides were presented on two screens of different sizes and were viewed at three viewing distances. Disparity information was removed in half the trials. For the conditions examined, display and target size had a significant effect on perceived size; disparity and scene background had a small effect; viewing distance and camera convergence distance had a negligible effect. Interestingly, it was found that the range of estimates of perceived height was reduced compared to estimates of the actual targets. Furthermore, for the small display, the smaller targets tended to be perceived the same or a bigger size than the actual targets and the large targets tended to be perceived smaller than the actual targets.