The purpose of this study was to examine the differences in illness perception and overall impact on fibromyalgia females from Spain and the Netherlands. A total of 325 fibromyalgia females from Spain (54.3 +/- 7.1 years) and the Netherlands (51.8 +/- 7.2 years) participated in the study. Illness perception and impact of fibromyalgia were assessed by the Revised Illness Perception Questionnaire and the Fibromyalgia Impact Questionnaire, respectively. Spanish fibromyalgia females perceived more symptoms related to their fibromyalgia (identity) such as nausea, breathlessness, wheezing or fatigue (P < 0.001) and had greater emotional representation (P < 0.01). Dutch fibromyalgia females experienced less timeline (acute/chronic) and consequences (all, P < 0.05), had a better cyclical timeline, personal control, treatment control and illness coherence (all, P < 0.001). Spanish fibromyalgia females reported higher impact of fibromyalgia than Dutch females (61.2 + 14.8 vs. 54.9 + 16.4, respectively; P < 0.001), but the effect size was small (Cohen's d = 0.41) . Impact of fibromyalgia and negative views of fibromyalgia were higher in Spanish fibromyalgia females, whereas Dutch fibromyalgia females presented higher score of positive beliefs about the controllability of the illness. Psychological interventions which help patients to cope with their illness perception might lead to an improvement of the impact of the disease on fibromyalgia females.