AIMS Informal coercion is a frequently used form of communication among mental health professionals to influence treatment outcomes. This study investigates the recognition, attitude, and application of different forms of informal coercion by mental health professionals. METHODS Mental health professionals of five psychiatric institutions in Germany and Switzerland (n = 424) took part in an online survey assessing the recognition of, attitudes towards, and application of different forms of informal coercion. RESULTS Mental health professionals did not recognize the extent of informal coercion adequately; especially stronger forms were underestimated. Recognition and application of informal coercion was predicted by attitudes towards coercion. Furthermore, there were differences between profession of participants regarding the recognition and application of informal coercion. CONCLUSIONS It is important to realize that the extent of applied informal coercion in therapeutic communication is often not recognized by practitioners, although it might interfere with a sound therapeutic relationship.