In this paper, we argue that friendship should receive more attention in social/personality research. Here, we focus on our area of expertise, personality traits, and review the literature on how personality traits influence friendship formation, maintenance, and dissolution. Specifically, we examine how personality traits of the actor and partner influence friendship development (i.e., who is more likely to initiate and end friendships, and who is more likely to be the target of friendship initiation and termination). We also discuss dyadic effects, such as personality similarity, on friendship development. Throughout this review, we draw on the literature on personality and romantic relationships to identify the most important gaps in the literature on personality and friendships. Our review suggests that agreeableness has the most consistent effects on both romantic relationships and friendships, followed by neuroticism. Extraversion, conscientiousness, and openness to experience have all been shown to influence relationship development, but their effects are inconsistent. We end with a call for more research on friendship beyond the role of personality traits and suggestions for specific future directions.Personality and friendship may be more common topics of study in other disciplines, but given how important friendships are for health and well-being, it is surprising that friendship has not received more attention from social and personality psychologists. A search for the term "friendship" as a keyword in journals containing either "social" or "personality" in the journal title produces 1,189 hits. In contrast, the same search on the word "relationship" in the abstract produces 9,682 hits Tables 1 and 2. Social/personality researchers have the tools necessary to provide important insights about the causes and consequences of friendship in people's lives. The goal of this article is to stimulate more research on friendship across a broad range of topics in social/personality psychology. We do this by reviewing one topic that we are especially