WHAT IS KNOWN ON THE SUBJECT?: Smoking is more common among people with serious mental illness, and it contributes to a reduced life expectancy. Several Western countries have successfully introduced smoke-free policies in inpatient mental health units. There is virtually no information about attitudes to smoking bans in mental health units from countries in the Middle East and North Africa region. WHAT THE PAPER ADDS TO EXISTING KNOWLEDGE?: We surveyed mental health professionals working in Qatar's main mental health service to determine support for and attitudes towards a proposed total smoking ban in psychiatric wards. Most staff who completed the survey supported an inpatient smoking ban. However, further analysis, both quantitative and qualitative, showed markedly ambivalent attitudes, that is staff simultaneously held attitudes that supported and opposed a smoking ban. Professionals who did not support a ban were more likely to have not received smoking cessation training in the last 5 years, to be a psychiatrist rather than a nurse or allied mental health professional, to be current smokers and to be a Middle Eastern and North African national. WHAT ARE THE IMPLICATIONS FOR PRACTICE?: Further staff training is necessary to achieve more consistent attitudes that support a total smoking ban and increase the likelihood of successful implementation. The attitudes in this study showed similarities and differences to those reported for mental health professionals in Western countries. This highlights that local research is necessary to help shape training and successfully implement smoke-free policies. ABSTRACT: Introduction Despite the fact that patients with serious mental illness (SMI) have high rates of smoking and an increased standardized mortality, there is virtually no information about attitudes to smoking bans in mental health units from countries in the Middle East and North Africa region. Aim To assess support for, and attitudes towards, a proposed total smoking ban in psychiatric wards among mental health clinicians in Qatar. Method Cross-sectional survey of mental health professionals working in Qatar's primary mental health service. Results The response rate was 68% (353/520). Support for a ban was assessed with a single-item question; 73% of respondents supported a ban with opposition significantly (p < .05) associated with being a current smoker, a Middle Eastern and North African (MENA) national, a psychiatrist versus a mental health nurse or allied health professional and not receiving smoking cessation training in the last 5 years. A 21-item questionnaire assessed attitudes to a total smoking ban. It showed marked ambivalence with multiple linear regression identifying MENA nationality, male gender and current smoking status as independent variables influencing attitudes. The most strongly held attitude supporting a ban was concern about passive smoking and against a ban was concern it may increase patient agitation. Qualitative data confirmed ambivalent views. Discussion The results show similarities and differences to research from other countries suggesting that cultural factors influence some attitudes to smoke-free policies. Implications for Practice Staff support and smoking cessation education are necessary to achieve more consistent staff attitudes to support smoke-free policies.