Introduction: Nursing care for institutionalized elderly should be done through systematized actions and by using the nursing process, directing the care actions to the affected needs with theoretical support and use of classification systems. In this context, the objective was to develop nursing diagnoses of the International Classification for Nursing Practice for institutionalized elderly. Method: This is a descriptive study, developed in a Long-stay Institution for Elderly People in Northeast Brazil. The survey was conducted from April to May 2016, with 28 institutionalized elderly. Data collection was guided by a form based in Henderson's theory and carried out through physical examination, clinical interview and records consultation. The nursing diagnoses were developed by using the International Classification for Nursing Practice version 2015. Data were analyzed using SPSS version 20.0. Results: Authors found 81 types of diagnoses, among which there was highlight to: impaired heart condition, productive cough, obesity, urinary incontinence, constipation, diarrhea, risk for falls, impaired sleep, impaired ability to perform hygiene, edema in the lower limbs and impaired vision, lack of recreational activity, positive socialization and positive religious belief. Most nursing diagnoses belonged to the needs of moving and maintaining desirable posture and communicating. Conclusion: There was an increased frequency of diagnoses related to biological needs.