Purpose: Drawing from self-determination theory, this exploratory mixed-methods study investigated the motivation and involvement of school staff regarding Dubai 30 × 30, an annual event for all Dubai residents, including schools, where the aim is to be physically active for 30 min each day for 1 month. Method: A convenience sample of 18 physical education teachers, 20 classroom teachers, and two principals from three private international schools participated in surveys, focus groups, and interviews following the 2022 Dubai 30 × 30. Results: Both autonomous and controlled motives underlied staff's involvement in Dubai 30 × 30, and motivation and involvement were significantly related. Themes highlighted physical education teachers' leadership as well as synergies across staff, parents, and community partners that embodied the ethos of whole-of-school physical activity approaches. Secondary analyses found school size, school level, and teacher gender were significant factors in staff motivation and/or involvement. Discussion/Conclusion: This study provides initial evidence related to school-based implementation of Dubai 30 × 30 and adds to the international literature on whole-of-school physical activity.