Conspiracism is not restricted to the fringe dwellers of society. International research suggests that such beliefs are quite common and that conspiracy theories may serve three basic psychological motives (i.e., epistemic, existential, and relational) for individuals. Yet, little is known about conspiracy theory awareness or conspiracism in Australasia. We report the first large systematic investigation of system justifying motives using two nationally representative samples of Australians (n = 1,011) and New Zealanders (n = 754). Our findings show that almost all are aware of local and international conspiracies, and the majority endorse one or more. Also, that all three psychological motives consistently relate to conspiracism but not to awareness. In a series of hierarchical multiple regressions, we find that epistemic (i.e., decreased analytic thinking), existential (i.e., less trust in others, and socially conservative political ideology and increased religiosity), and relational motives (i.e., increased anomie and disillusionment with the government) were all significant unique predictors of increased local and international conspiracism. Findings are discussed in terms of the importance of understanding conspiracism as an ideological belief system that may function to serve underlying psychological motives.