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Across seven experiments and one survey (n = 4,282), people consistently overestimated out-group negativity towards the collective behaviour of their in-group. This negativity bias in group meta-perception was present across multiple competitive (but not cooperative) intergroup contexts and appears to be yoked to group psychology more generally; we observed negativity bias for estimation of out-group, anonymized-group and even fellow in-group members’ perceptions. Importantly, in the context of US politics, greater inaccuracy was associated with increased belief that the out-group is motivated by purposeful obstructionism. However, an intervention that informed participants of the inaccuracy of their beliefs reduced negative out-group attributions, and was more effective for those whose group meta-perceptions were more inaccurate. In sum, we highlight a pernicious bias in social judgements of how we …