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Abstract : Radiotherapy on patients with nasopharyngeal carcinoma (NPC) can induce oropharyngeal dysphagia (OPD). Giving a diet to OPD patients may increase penetration-aspiration risk, resulting in pneumonia and death. One of the methods to reduce penetration-aspiration risk in OPD patients is adjusting the bolus delivery. This study aims to determine the relationship between bolus delivery methods and the incidence of penetration-aspiration in NPC patients after radiotherapy. The type of research is pre-experimental with nine sequential observations. Sampling was carried out for three months consecutively until the sample size was met (n=23). Samples were instructed to swallow three boluses (puree, thick, and thin liquid) using three types of delivery (spoon, straw, and cup). The incidence of penetration-aspiration using spoons, straws, and cups for each kind of bolus was recorded. The statistical data analysis was performed using the Cochran comparison test and the McNemar comparison test. The incidence of penetration-aspiration occurred in as many as 64 out of 207 swallow attempts (30,91%). Puree bolus viscosity resulted in a p-value = 0.054, thick liquid bolus resulted in a p-value = 0.080, and thin liquid bolus resulted in a p-value = 1,000. There is no relationship between the bolus delivery methods and penetration-aspiration incidence in patients with NPC after radiotherapy.