The objective was to develop a psychometrically sound questionnaire measure of lay people's beliefs about the importance of different signs of wellness (the Wellness Beliefs Scale, WBS).Questionnaire items were derived from qualitative literature. 942 people (recruited from the community and patient support groups) participated in 2 cross-sectional studies using paper and web-based questionnaires. Study 1 participants completed the initial version of the WBS. Study 2 participants completed the revised version of the WBS and existing measures of health beliefs, illness perceptions, and health status. Factor analysis confirmed that the WBS measures 3 distinct wellness beliefs: belief in the importance of biomedical (absence of illness), functional (ability to carry out daily tasks), and wellbeing (vitality) indicators of wellness. The 3 resulting subscales all had good internal consistency and could be used to cluster participants into 3 groups. Wellness belief scores were related to gender, health status and subjective health; there were few associations with health beliefs. In conclusion, the WBS is a promising new measure of 3 distinct wellness beliefs, with good initial psychometric properties, which could potentially be used to better target individualised health promotion interventions. Weinman, Petrie, Moss-Morris, & Horne, 1996). This focus on illness rather than health is justifiable, but an extended focus to include the study of health is now being recognised as important. As Lawton (2003) has argued, comparatively little is known about how lay people think about health and yet 'healthy' people are increasingly the subject of health promotion interventions and other forms of medical attention. The need to attend to health beliefs and behaviours, as distinct from illness beliefs and behaviours, was emphasised by Rakowski (1984) and there is a reasonably extensive qualitative literature on lay perceptions of wellness (for a review see Hughner & Kleine, 2004). This study was inspired by and draws on that qualitative literature in order to develop a questionnaire measure of lay definitions of wellness.Despite recent developments in positive psychology, people's perceptions of wellness have not been widely incorporated into main-stream health psychology. There is no established or widely used theoretical framework for thinking about the impact of wellness beliefs on health and illness behaviours and there are no well-validated measures of lay perceptions of wellness.However, three lines of argument suggest that wellness beliefs could be an important construct for and indeed a necessary addition to health psychology.