Autistic adults often face higher levels of depression, anxiety, and stress and reduced levels of quality of life and employment in comparison to their neurotypical peers. Nature-based interventions (NBIs), which utilize outdoor environments and activities for health and wellbeing outcomes, could provide possibilities to meet these various needs. This study therefore aims to identify the extent of academic literature examining NBIs for autistic adults. A scoping review of peer-reviewed articles published between 1985 and 2023 was conducted. Ten databases were systematically searched, and additional hand searching was conducted. Studies involving substantial engagement with an NBI and involving autistic adults (age ≥ 18), or developmental disability if specific diagnosis was not identified, were included. A total of seven studies were identified; however, three studies did not refer to autism specifically, identifying developmental disability more broadly. NBIs were conducted in a variety of international locations and involved a diverse range of activities and outcomes. While NBIs can provide outcomes relevant to employment, health, and wellbeing, multiple limitations and literature gaps are noted. The findings indicate a strong need for further research specific to autism.