Why was this study done?: More autistic people and researchers have advocated to study autism in critical and positive ways. While it is important to promote better well-being for autistic people, little is known about what well-being actually means to them.What was the purpose of this study?: The purpose of our critical review was to identify how the concept of well-being in autistic people is understood and described in academic literature. We also critiqued how well-being research considers the input and perspectives of autistic adults.What did we do?: We systematically searched for research articles published between 2013 and 2020. We identified 63 articles that involved direct data collection with autistic adults and focused on well-being and related concepts such as quality of life, life satisfaction, and happiness. We analyzed the articles by focusing on how they used language to describe well-being in autistic adults and how they valued the data collected from these adults.What did we find?: We identified several ways that article authors described their understanding of autistic well-being: (1) well-being as an objective and uncontested object, (2) well-being is personal and can vary in nature, (3) well-being warrants a measure that considers opinions of autistic people, and (4) well-being as very specific to autistic people's subjective perspectives. We critically analyzed how these different understandings limit or open life possibilities for autistic people's well-being.How will this work help autistic people?: We recommend that researchers critically reflect on how they engage autistic adults and use their input in research. Promoting well-being needs to be meaningful and ethical to autistic adults. Research also needs to advocate for social justice to challenge how the majority in society understands or misunderstands autistic people.