Researchers have investigated the phenomenon of overparenting of emerging adult children and its association with emerging adult development. With the increasing body of research in recent years on this topic, a timely systematic review is needed to gain a better understanding of the literature. This systematic review targets quantitative studies of overparenting and several domains of development (psychological, behavioral, social and relational, learning/academic and career) of emerging adult children (with a sample mean age between 18 to 29) that are published in English in peer-reviewed journals in the past 20 years (2002–2021). A search of four databases (PsycINFO, Web of Science, ERIC, and ASSIA) identified 74 eligible studies between 2002 to 2021. The majority of the studies are theory-driven ( n = 65), with self-determination theory being the most used. Study samples ranged from 89 to 2,253, most are of college students ( n = 65), from the U.S. ( n = 58), and with more female than male participants ( n = 65). Almost all studies used a cross-sectional design ( n = 70) and at least one of the several established overparenting measures. Various analytical strategies were used, ranging from structural equation modeling to latent class/profile analysis. Findings overwhelmingly suggested negative associations between overparenting and emerging adults’ development in the psychological, behavioral, social and relational, learning/academic and career domains. Some mixed findings were also reported, especially in the learning/academic and career domain. Limitations and future directions are also discussed.