Groupwork is a useful classroom tool, but may not fully benefit students who are ostracized by peers due to nonacademic factors, like weight. Here, undergraduate students estimated GPAs of hypothetical student peers who were described as "overweight" or "normal-weight" and judged how much they wanted to work with them. We found small but significant effects: students rated overweight peers as having lower GPAs and reported less desire to work with them relative to normal-weight peers. Instructors should be cognizant that overweight students are believed by their peers to be less desirable class partners and may be excluded from classroom participation.