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Aims: To compare nurses' non‐optimal eating behaviours across different shifts, to examine whether non‐day shifts were related to deviation from optimal dietary behaviours compared with day shifts and whether such deviation was related to non‐optimal macronutrient intake. Design: This is a 4‐day intensive longitudinal study. Methods: A convenience sample of hospital nurses was recruited in Taiwan. From September 2018 through January 2019, 120 participants completed 4‐days of 24‐h dietary recalls. One‐way ANOVA and Kruskal–Wallis H test were used to compare differences in energy and macronutrient intake and frequency of meals and snacking, respectively. Generalized linear regressions examined (1) the associations between shiftwork schedules and non‐optimal eating behaviours and (2) associations between non‐optimal eating and high energy contribution of non‐optimal macronutrients. Results: Nurses consumed less energy on evening and night shifts compared with day shifts. However, energy intake from snacking was higher on evening and night shifts relative to day shifts. Nurses consumed less meals but had higher snacking frequency on non‐day shifts. In addition, high energy intake from snacking was positively associated with high energy intake from saturated fat. Conclusions: Nurses were more likely to have non‐optimal eating behaviours on non‐day shifts, which may contribute to an increased intake of saturated fat; thus, increasing their risk of chronic diseases. Strategies to improve non‐day shift nurses' non‐optimal eating behaviours may be beneficial to their health. Impact Shiftwork is known to affect nurses' eating behaviours; however, which shift is associated with unhealthy eating remains inconclusive. Despite lower energy intakes, nurses had higher intake by snacking on evening and night shifts. High snacking intake was associated with a high intake of saturated fat. Hospitals can increase the availability of healthy foods on evening or night shifts, which may improve non‐day shift nurses' non‐optimal eating behaviours. [ABSTRACT FROM AUTHOR]