Non-communicable diseases (NCDs) are chronic medical conditions that are, by definition, non-infectious, and non-Transmissible among people and caused by a combination of genetic, physiological, environmental and behavioral factors. Affecting all age groups, regions and countries, NCDs cause 72% of deaths in Oman. Health promotion (HP) capacity development is considered fundamental to strengthening and sustaining action against NCDs. This study aimed to map the existing HP capacity for NCDs in Oman by assessing existing knowledge, skills, commitment, structure, systems and leadership and identifying gaps where further capacity is required. The current study used an adapted version of the World Health Organization capacity mapping tool for HP to assess the stage of development across eight HP capacity domains. Quantitative data were collected from 306 geographically dispersed participants across Oman via an online cross-sectional survey. Analyses revealed low scores in policies and plans, collaboration, partnership and professional development domains and even lower scores in the domains of program delivery, information systems and financing. We recommend Oman build and develop more capacity in all domains. The implications of findings are discussed in the context of the current HP policy and practice in Oman.