Background: Play is an essential part of children’s lives yet remains notoriously difficult to define. Understanding children’s perceptions of play is crucial in order to improve the measurement of play across studies and support the development of new hypotheses on play and learning. Aims: This review sought to (1) map research that has examined children’s conceptualisations of play, (2) identify methods used to elicit children’s perspectives, (3) summarise findings, (4) identify gaps within existing literature, and (5) make recommendations for future research. Methods: A scoping review methodology was used in consultation with 49 children (23 male; 26 female) aged 5 to 11 years in primary schools in Ireland. Data from the literature were extracted and summarised, and findings were thematically synthesised. Data from the child consultations were thematically analysed. Results: 42 peer-reviewed studies met the inclusion criteria. These varied widely in study characteristics, research questions and methods. Overall, children identified play as social and fun with affective qualities. Autonomy and agency was viewed as integral to play, which also often involved the outdoors, toys, games and physical activity. Finally, children viewed play as creative, as something that could co-occur with learning, and that often had adult involvement. Children with disabilities were largely under-represented in the literature. Conclusions: The findings of this review have significant implications for play policy which has primarily been framed by adults’ conceptualisations of play. Conducted in consultation with children, this review reveals a keen appreciation by children of play as valuable, nuanced and complex.