<p>As urbanization accelerates and environmental concerns intensify, electric motorcycles are gaining attention as an eco-friendly and sustainable mode of transportation. However, research on their acceptability and market penetration in Southeast Asia remains limited. This study analyzes the key factors that influence the adoption of electric motorcycles in major Southeast Asian countries. Using the Extended Unified Theory of Acceptance and Use of Technology (UTAUT) as a framework, we examined the relationships between six key factors: performance expectancy, social influence, government intervention, environmental concern, performance risk, and individual innovativeness, and behavioral intention to adopt electric motorcycles. A survey was conducted, collecting 313 responses, and structural equation modeling and multi-group analysis were employed to assess moderating effects based on country, gender, education level, and motorcycle ownership. The results revealed that social influence and government intervention positively influenced adoption intention, while environmental concern had a negative impact. Additionally, the multi-group analysis demonstrated that the significance of adoption factors varied across gender, country, and education level, with differences also observed between motorcycle owners and non-owners. These findings highlight the importance of country-specific policy design and technological advancements to enhance the acceptability and market growth of electric motorcycles. By offering practical insights, this study contributes to expanding the electric motorcycle market and addressing environmental challenges in Southeast Asia.</p>