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While misinformation has been around for centuries, the effects of online brand-related misinformation on consumers’ engagement remain tenuous. Addressing this gap, we develop the concept of online brand-related misinformation engagement, a consumer’s (e.g. cognitive/emotional) resource investment in their interactions with misinformation about brands. Recognizing the persuasive nature of misinformation, we draw on Cialdini’s Weapons of Persuasive Influence to develop a typology comprising three positively valenced online brand-related misinformation engagement sub-types (i.e. reciprocal, social proof-, and consistency-based misinformation engagement), and three negatively valenced online brand-related misinformation engagement sub-types (i.e. repudiating, thwarting, and oppositional misinformation engagement). We then develop a Weapons of Influence-informed model that outlines the effect of online brand-related misinformation authority and scarcity on consumers’ brand-related misinformation evaluation (liking), and its subsequent effect on their positive or negative online brand-related misinformation engagement, respectively. While consumers’ positive online brand-related misinformation engagement is predicted to yield online misinformation continuation or -intensification, its negative counterpart will generate online misinformation adjustment or -correction.